Medicare IRMAA: How Income Can Increase Your Medicare Premiums
Medicare premiums are not determined solely by whether you worked during the year or how much you paid in Medicare taxes. For some beneficiaries, income reported on a federal tax return can result in higher Medicare Part B and Part D costs through the Income-Related Monthly Adjustment Amount (IRMAA).
One of the most important IRMAA planning issues is timing. Medicare generally uses tax-return information from an earlier year to determine whether IRMAA applies. For example, 2026 Medicare IRMAA is generally based on 2024 federal tax-return information.
That means a Roth conversion, required minimum distribution (RMD), capital gain, rental-property sale, business-income event, or other taxable transaction can occur in one year while the resulting Medicare premium effect may not appear until two years later.
Understanding that relationship can help retirees and pre-retirees evaluate the complete cost of a tax decision before the transaction is finalized.
Florence Tax LLC helps retirees and other taxpayers model the tax consequences of significant income decisions. IRMAA is one part of that analysis—not an automatic reason to avoid a transaction that may otherwise make sense as part of a broader tax plan.
What Is Medicare IRMAA? The Short Answer
IRMAA stands for Income-Related Monthly Adjustment Amount. Certain Medicare beneficiaries whose modified adjusted gross income exceeds applicable thresholds pay additional amounts for Medicare Part B and Part D.
Social Security generally determines IRMAA using the most recent federal tax-return information available from the IRS. In many cases, that means tax information from two years before the Medicare premium year. For example, 2026 Medicare premiums are generally determined using income reported on the taxpayer's 2024 federal tax return.
IRMAA is not:
A federal income-tax bracket
An additional income tax
A Medicare late-enrollment penalty
The calculation used to determine whether Social Security benefits are taxable
Necessarily a permanent increase in Medicare premiums
A useful framework is:
Tax-year income → IRMAA MAGI → applicable Medicare premium year → IRMAA tier → additional Part B and/or Part D cost
Because income and Medicare premiums can be separated by approximately two years, an income decision made today may create a Medicare cost that does not appear until later.
For current information about how Social Security determines higher Medicare premiums, see the Social Security Administration's Medicare premium guidance.
Which Parts of Medicare Have IRMAA?
IRMAA can increase the amount certain higher-income beneficiaries pay for:
Medicare Part B, which generally covers physician and outpatient services
Medicare Part D, which provides prescription drug coverage
IRMAA does not apply to Medicare Part A in the same manner.
If a beneficiary has both Part B and Part D and is subject to IRMAA, an income-related adjustment can apply to both. If the beneficiary has only one of those coverages, IRMAA applies only to the coverage the individual has.
How Does the IRMAA Lookback Work?
Social Security generally uses the most recent federal tax-return information available from the IRS when determining IRMAA. In many cases, that information comes from two years before the Medicare premium year.
For example:
2024 tax return → generally used for 2026 Medicare premiums
2025 tax return → generally used for 2027 Medicare premiums
For 2026, SSA guidance specifically identifies 2024 tax information as the information generally used, with older information potentially used when the more recent return is unavailable.
This delay matters when someone:
Completes a substantial Roth conversion
Realizes a significant capital gain
Sells rental or investment property
Takes a large discretionary IRA distribution
Receives significant business or consulting income
Experiences another unusually high-income event
For example, a Roth conversion completed in 2026 may increase income reported on the 2026 federal return and potentially affect Medicare premiums in 2028, assuming the normal lookback applies.
That delayed effect is easy to overlook when evaluating the transaction. A complete projection should therefore identify both:
the tax year in which the income occurs
and
the Medicare premium year that may be affected.
What Income Does IRMAA Use?
IRMAA uses a specific definition of modified adjusted gross income (MAGI). Under current Social Security guidance, IRMAA MAGI generally consists of:
Adjusted gross income (AGI) + tax-exempt interest income = IRMAA MAGI
On the current federal Form 1040, SSA identifies adjusted gross income from line 11 and tax-exempt interest from line 2a when describing this calculation.
This is different from taxable income, which is calculated after deductions and other applicable adjustments.
That distinction matters. A taxpayer's standard or itemized deduction may reduce federal taxable income without reducing the MAGI used for IRMAA.
Income that increases adjusted gross income may therefore affect IRMAA, including, depending on the taxpayer's circumstances:
Taxable wages or business income
Taxable pension income
Traditional IRA and retirement-plan distributions
RMDs
Taxable Roth conversions
Interest and dividends
Capital gains
Rental income
In addition, tax-exempt interest is added to AGI for the IRMAA calculation.
For current SSA guidance on the calculation, see Social Security's Modified Adjusted Gross Income guidance.
Tax-Exempt Interest Can Count Toward IRMAA
Tax-exempt interest provides a good example of why taxable income and IRMAA MAGI are not the same thing.
Interest from certain municipal bonds may be excluded from regular federal taxable income but is generally added to adjusted gross income when determining MAGI for IRMAA purposes.
In other words:
Tax-exempt does not necessarily mean Medicare-premium-neutral.
That does not make tax-exempt investments inappropriate. It simply means their effect should be evaluated as part of the taxpayer's complete tax and Medicare-income picture.
Florence Tax LLC provides tax analysis of income sources and transactions. Investment recommendations should be discussed with an appropriately licensed financial professional.
What Are the Medicare IRMAA Brackets?
For 2026, Medicare Part B and Part D IRMAA begins when modified adjusted gross income exceeds $109,000 for individual filers or $218,000 for married couples filing jointly.
For the principal individual and married-filing-jointly categories, the 2026 tiers are:
2024 MAGI Used for 2026 Premiums — Individual | 2024 MAGI Used for 2026 Premiums — Married Filing Jointly |
|---|---|
$109,000 or less | $218,000 or less |
More than $109,000 through $137,000 | More than $218,000 through $274,000 |
More than $137,000 through $171,000 | More than $274,000 through $342,000 |
More than $171,000 through $205,000 | More than $342,000 through $410,000 |
More than $205,000 but less than $500,000 | More than $410,000 but less than $750,000 |
$500,000 or more | $750,000 or more |
The first row represents taxpayers who generally are not subject to IRMAA. Each succeeding tier can result in higher Part B and Part D amounts.
Married taxpayers who file separately and lived with their spouse during the tax year are subject to a different IRMAA structure and should use the applicable SSA/CMS table rather than the married-filing-jointly thresholds above.
For 2026, the standard Medicare Part B premium is $202.90 per month. Depending on the applicable income tier, Part B IRMAA can increase the total Part B monthly premium. Part D IRMAA is a separate additional amount added to the beneficiary's applicable Part D premium.
For the official current amounts, see the CMS 2026 Medicare Part B premiums and IRMAA information.
Why IRMAA Is Sometimes Called a “Cliff”
IRMAA is sometimes described as having a cliff because crossing an income threshold can move a beneficiary into a higher premium tier. The increase is not necessarily limited to a small surcharge on only the income above the threshold, as it would be under a progressive income-tax calculation.
That does not mean that “one dollar always costs thousands.” The actual household effect depends on factors such as:
Filing status
The number of Medicare beneficiaries in the household
Whether the beneficiaries have Part B and Part D coverage
The applicable premium year
The specific IRMAA tier
A relatively small increase in MAGI can sometimes produce a meaningful annual premium difference. That is why projected MAGI should be reviewed before a controllable transaction is completed.
Do Both Spouses Pay IRMAA?
For married couples, household tax-return income can determine the applicable filing-status tier, while Medicare premiums apply to each Medicare beneficiary individually.
If both spouses are enrolled in affected Medicare coverage, the household impact may be greater than it would be when only one spouse is a Medicare beneficiary. However, it is not appropriate to automatically double every IRMAA amount without confirming each spouse's Medicare enrollment and applicable coverage.
Does Social Security Count Toward IRMAA?
Social Security taxation and Medicare IRMAA are separate calculations, even though some of the same income can affect both.
IRMAA is generally based on modified adjusted gross income consisting of adjusted gross income plus tax-exempt interest. To the extent Social Security benefits are included in adjusted gross income, that taxable portion can therefore affect IRMAA MAGI.
This does not mean that all Social Security benefits automatically count toward IRMAA. The federal Social Security taxation calculation first determines how much of the benefits, if any, is included in adjusted gross income.
The interaction can therefore look like this:
Other income → potentially more taxable Social Security → higher AGI → potentially higher IRMAA MAGI
That is one reason a retirement-income decision such as an IRA withdrawal, RMD, Roth conversion, or capital gain can potentially affect both Social Security taxation and future Medicare premiums.
For a detailed explanation of the federal Social Security calculation, see Is Social Security Taxable? How Federal Taxes on Benefits Work.
IRA Withdrawals and IRMAA
Taxable distributions from traditional IRAs generally increase adjusted gross income and can therefore increase the MAGI used to determine Medicare IRMAA.
A taxable IRA withdrawal may potentially affect several areas at the same time:
Federal income tax
The taxable portion of Social Security benefits
Medicare IRMAA in a later premium year
State income tax, where applicable
The interaction may look like this:
Taxable IRA withdrawal → higher AGI → higher IRMAA MAGI → potentially higher future Medicare premiums
Not every traditional IRA distribution is necessarily fully taxable. If the taxpayer has nondeductible contributions or other basis in traditional IRAs, the taxable amount may require additional calculation.
For taxpayers who have discretion over the timing or amount of a withdrawal, evaluating the distribution before it occurs can help identify both its immediate tax consequences and its potential Medicare premium effect under the applicable lookback rules.
RMDs and IRMAA
Taxable required minimum distributions generally increase adjusted gross income and can therefore increase IRMAA MAGI. Because Medicare commonly uses earlier tax-return information, an RMD taken this year may potentially affect Medicare premiums in a later year.
Unlike a discretionary IRA withdrawal, an RMD generally cannot simply be skipped once the taxpayer is required to take it.
That makes pre-RMD planning particularly important.
Before RMDs begin, taxpayers may have greater flexibility to evaluate strategies such as:
Earlier retirement-account withdrawals
Roth conversions
Qualified charitable distributions when eligible
Capital-gain timing
Other retirement-income decisions
Planning cannot guarantee that IRMAA will be avoided, nor should avoiding IRMAA necessarily be the primary objective. The purpose is to understand how future mandatory distributions may affect taxes, Social Security taxation, and Medicare premiums before those distributions become less flexible.
For a detailed discussion of required distributions and their broader tax consequences, see RMD Taxes: How Required Minimum Distributions Affect Your Tax Bill.
Roth Conversions and IRMAA
A Roth conversion generally creates taxable income in the year of conversion and increases adjusted gross income to the extent the converted amount is taxable. That additional income can increase IRMAA MAGI and potentially affect Medicare premiums in a later year.
A useful planning framework is:
Proposed Roth conversion → additional taxable income → higher AGI and IRMAA MAGI → potential future IRMAA → total current and future cost
A complete conversion analysis should therefore consider more than the federal income tax generated by the conversion. Depending on the taxpayer's circumstances, the analysis may include:
Federal income tax
Arizona or other applicable state income tax
Social Security taxation
Potential future Medicare IRMAA
Future RMDs
Future tax brackets and filing status
Survivor-tax considerations
The taxpayer's liquidity and ability to pay the conversion tax
Crossing an IRMAA threshold does not automatically mean a Roth conversion is a poor decision.
A conversion may create additional Medicare premiums for a particular year while potentially reducing future pretax retirement balances, future RMDs, or taxes in later years. Conversely, reducing the conversion amount may make sense when the long-term benefit of crossing another IRMAA tier is limited.
The appropriate comparison is therefore not simply:
IRMAA versus no IRMAA
but rather:
Total cost of the proposed conversion versus the projected multi-year result with a different conversion amount or no conversion
For a detailed discussion of conversion timing and determining an appropriate amount, see Roth Conversion: When Does It Make Sense and How Much Should You Convert?
Should You Limit a Roth Conversion to Stay Below an IRMAA Threshold?
Sometimes it is worth testing, but staying below an IRMAA threshold should not become an automatic rule.
A useful projection can compare:
Scenario A: Conversion amount that remains within the current projected IRMAA tier
Scenario B: Larger conversion that crosses into the next projected IRMAA tier
For each scenario, calculate the projected:
Federal income tax
State income tax
Social Security tax interaction, when applicable
Future Part B and Part D IRMAA cost
Effect on future RMDs and taxable retirement income
The larger conversion may still produce the more favorable multi-year result even after including additional Medicare premiums. In other circumstances, limiting the conversion may preserve much of the tax-planning benefit while avoiding an additional IRMAA tier.
IRMAA should be included in the Roth conversion analysis—not allowed to replace the Roth conversion analysis.
Capital Gains and IRMAA
Realized capital gains that are included in adjusted gross income can increase IRMAA MAGI and potentially affect Medicare premiums in a later year.
Potential sources include:
Sales of appreciated securities
Sales of investment or rental property
Sales of business interests
Other transactions producing taxable capital gain
This is important because a long-term capital gain may qualify for a preferential federal income-tax rate while still increasing adjusted gross income for IRMAA purposes.
A significant gain may therefore have several consequences:
Capital gain → federal capital-gains tax + potential state tax + higher IRMAA MAGI + possible future Medicare premium increase
A one-time gain can potentially create IRMAA for a later premium year even when the taxpayer does not expect that income to recur.
That does not mean an investment or property should be retained solely to avoid IRMAA. When the timing of a significant transaction is controllable, however, its potential Medicare premium effect should be included in the analysis before the transaction occurs.
Rental-Property Sales and IRMAA
Selling rental property can create several tax consequences that may increase adjusted gross income and potentially affect IRMAA.
Depending on the property's history and the transaction, the sale may involve:
Capital gain
Section 1231 gain or loss
Unrecaptured Section 1250 gain
Depreciation-related tax consequences
Other taxable items associated with the transaction
The resulting income may affect federal taxes, Arizona or other state taxes, and Medicare IRMAA in a later premium year.
The Medicare consequence should therefore be evaluated as one component of the complete property-sale analysis, rather than as a reason by itself to proceed with or avoid the transaction.
For more information about the tax consequences of selling rental real estate, see How Taxes Work When You Sell a Rental Property.
Business Income and IRMAA
Business owners approaching retirement may continue to receive income from a final working year, consulting, pass-through business activity, or a business transition or sale. To the extent that income increases adjusted gross income, it may also increase IRMAA MAGI and potentially affect Medicare premiums in a later year.
This is particularly important around retirement because a taxpayer may move from a high-income working year into a substantially lower-income retirement year while Medicare is still using earlier tax-return information.
When possible, significant business transactions should be evaluated before agreements and transactions are finalized. Tax planning may include projecting income by year, identifying available timing choices, estimating federal and state taxes, and determining whether the transaction may affect a future IRMAA tier.
Florence Tax LLC provides tax analysis and business tax advisory services. Legal, investment, valuation, and transaction-structuring matters may require coordination with other qualified professionals.
Does a QCD Affect IRMAA?
Potentially.
A qualified charitable distribution (QCD) is generally a distribution made directly from an eligible IRA to a qualifying charitable organization that meets the federal QCD requirements. To the extent the distribution qualifies for exclusion from gross income, it can receive different tax treatment from taking an otherwise taxable IRA distribution personally and then making a charitable contribution.
That distinction can matter for IRMAA because IRMAA begins with adjusted gross income.
Conceptually:
Taxable IRA distribution → generally increases AGI → may increase IRMAA MAGI
while:
Qualifying QCD → generally excluded from gross income → may produce a different AGI and IRMAA result
A QCD can also potentially satisfy all or part of an IRA owner's required minimum distribution when the applicable requirements are met.
However, QCD rules include eligibility, age, account-type, charitable-recipient, documentation, and annual-limit requirements. A charitable contribution should not be structured as a QCD without confirming that the transaction satisfies the current federal rules.
For current requirements, see IRS Publication 590-B, Distributions from Individual Retirement Arrangements (IRAs).
What About Roth IRA Withdrawals?
A qualified Roth IRA distribution is generally tax-free and is not included in gross income. As a result, a qualified Roth IRA distribution generally does not increase adjusted gross income or IRMAA MAGI.
That gives qualified Roth IRA distributions a different IRMAA effect from taxable traditional IRA distributions.
For example:
$25,000 taxable traditional IRA distribution → generally increases AGI → may affect IRMAA MAGI
while:
$25,000 qualified Roth IRA distribution → generally not included in gross income → generally does not increase IRMAA MAGI
The distinction is important, but not every Roth IRA distribution is necessarily a qualified distribution. Nonqualified distributions are subject to Roth IRA ordering and tax rules, and a portion may potentially be taxable depending on the circumstances.
A Roth conversion should also not be confused with a Roth IRA withdrawal. A taxable Roth conversion generally increases income in the conversion year and may affect IRMAA, while a qualified distribution from an established Roth IRA generally does not.
For current Roth IRA distribution rules, see IRS Publication 590-B.
Can You Plan Around IRMAA?
In some circumstances, taxpayers can manage income in ways that affect future IRMAA. But the objective should not automatically be to avoid IRMAA at any cost.
Potential planning opportunities may include:
Projecting IRMAA MAGI before completing significant transactions
Modeling different Roth conversion amounts
Evaluating discretionary IRA withdrawals
Reviewing the timing of significant capital gains
Considering QCDs when eligible and consistent with charitable goals
Projecting business and rental income
Planning before Medicare eligibility
Reviewing whether an applicable SSA life-changing-event procedure may provide relief
The key is to compare alternatives.
For example, a Roth conversion that produces additional Medicare premiums may still create a more favorable long-term tax result. Conversely, a transaction might be reduced, delayed, or otherwise adjusted without materially changing the taxpayer's larger financial objective.
IRMAA is a cost to model—not necessarily a cost to avoid.
The Real Cost of Crossing an IRMAA Threshold
Because IRMAA uses income tiers, a relatively small increase in MAGI can sometimes move a Medicare beneficiary into a higher premium tier.
That does not necessarily mean the underlying transaction should be avoided. Instead, calculate the incremental cost created by the decision.
A useful framework is:
Additional federal income tax
+ Additional state income tax
+ Additional Part B IRMAA
+ Additional Part D IRMAA
= Total incremental near-term cost
For married couples, the calculation should also identify how many spouses are Medicare beneficiaries. A joint tax return may determine the applicable household income tier, but IRMAA is assessed separately for each Medicare beneficiary.
The resulting cost can then be compared with the purpose and projected multi-year benefit of the transaction.
For example, a Roth conversion might create additional federal tax and future Medicare premiums while also reducing future pretax retirement balances and RMDs. The appropriate analysis compares those costs and potential benefits rather than treating the IRMAA threshold as an automatic stopping point.
Crossing an IRMAA threshold is a cost to calculate—not necessarily a reason to reject the transaction.
IRMAA Planning Before Medicare Begins
Tax decisions made before Medicare enrollment can potentially affect premiums after Medicare begins because of the IRMAA lookback.
For example, someone approaching age 65 might complete a substantial Roth conversion, realize a large capital gain, sell rental property, or receive significant business income before enrolling in Medicare. If that income appears on a tax return later used for an IRMAA determination, the transaction may affect Medicare premiums after enrollment begins.
This does not mean taxpayers approaching Medicare should automatically avoid significant income events.
Instead, pre-Medicare tax planning should identify:
When Medicare coverage is expected to begin
Which tax return may be used for the first applicable IRMAA determination
Projected income during those tax years
Planned Roth conversions or retirement-account withdrawals
Expected capital gains or property transactions
Business or consulting income
Whether income is expected to decline materially after retirement
The important point is that IRMAA planning can begin before Medicare does.
Can an IRMAA Determination Be Changed or Appealed?
Potentially.
The appropriate Social Security Administration procedure depends on why the beneficiary believes the IRMAA determination should change.
For example, a beneficiary may need to address situations involving:
A qualifying life-changing event that reduced income
Incorrect or outdated tax-return information
An amended federal tax return
An IRS correction
An incorrect filing status or income amount used in the determination
Another disagreement with SSA's IRMAA determination
These circumstances do not necessarily use the same procedure.
When income has decreased because of an SSA-recognized life-changing event, a beneficiary may be able to request that Social Security use more recent income information to make a new IRMAA determination.
However, having lower income today does not automatically qualify someone for relief, and neither does receiving IRMAA because of a one-time high-income transaction.
The reason for the income change and the applicable SSA requirements matter.
For current information about requesting a new decision based on a life-changing event, see SSA's Medicare Income-Related Monthly Adjustment Amount guidance.
What Life-Changing Events Can Affect an IRMAA Determination?
Social Security recognizes specific life-changing events that may allow a beneficiary to request a new IRMAA determination when the event causes or is associated with a reduction in modified adjusted gross income.
SSA currently identifies the following life-changing events:
Marriage
Divorce or annulment
Death of a spouse
Work stoppage
Work reduction
Loss of income-producing property
Loss of pension income
Employer settlement payment
Each category has specific requirements. For example, not every decline in investment or property income qualifies as a loss of income-producing property under SSA's rules.
Similarly, simply deciding to take less income in a later year does not necessarily create a qualifying life-changing event.
This distinction is particularly important after voluntary high-income transactions.
A large:
Roth conversion
Capital gain
IRA withdrawal
Investment sale
Property sale
does not automatically become an SSA-recognized life-changing event merely because the income does not recur the following year.
For the official requirements and documentation, see Form SSA-44, Medicare Income-Related Monthly Adjustment Amount – Life-Changing Event.
Retirement, Reduced Work, and Form SSA-44
Retirement can create a situation in which the income Social Security is using for IRMAA no longer reflects the beneficiary's current circumstances.
For example, suppose a taxpayer had substantial wages in the tax year SSA is using to determine current Medicare premiums but has since retired and experienced a significant reduction in income.
A work stoppage or work reduction is among the life-changing events recognized by SSA. If the applicable requirements are satisfied, the beneficiary may be able to request that SSA make a new IRMAA determination using more recent or estimated income information.
Form SSA-44 is used for qualifying life-changing-event requests and generally requires information about:
The qualifying event
The date of the event
The taxpayer's modified adjusted gross income
Evidence supporting the event
More recent or estimated income information, as applicable
Approval is not automatic, and the beneficiary should follow the current SSA instructions regarding acceptable documentation and income estimates.
For current instructions, see Form SSA-44 and its filing requirements.
A One-Time Income Event Does Not Automatically Qualify for IRMAA Relief
A taxpayer may receive IRMAA because of an unusually high-income year and then have substantially lower income afterward. That fact alone does not necessarily mean SSA will reduce the IRMAA determination.
For example, income may have increased because of:
A voluntary Roth conversion
A large capital gain
A discretionary IRA withdrawal
A property sale
An investment sale
Those transactions may be one-time events, but “one-time income” is not itself an SSA life-changing-event category.
Relief depends on whether the taxpayer's circumstances satisfy an applicable SSA procedure—not simply on whether the income is expected to recur.
This is another reason to model IRMAA before completing a controllable transaction rather than assuming the resulting premium increase can later be reversed.
Is IRMAA Permanent?
Not necessarily.
IRMAA is generally determined separately for each Medicare premium year using the applicable tax-return information and current income thresholds.
A one-time income event may therefore cause IRMAA for a particular premium year without creating a permanent increase.
For example:
Large income event in 2024 → potentially higher 2026 Medicare premiums
If income is substantially lower in 2025, that lower income may generally be reflected when the applicable tax information is later used to determine 2027 premiums, assuming the normal lookback applies.
Recurring high income, ongoing business income, repeated Roth conversions, substantial RMDs, or recurring investment income can produce IRMAA in multiple years.
The important planning distinction is:
One-time IRMAA does not necessarily mean permanent IRMAA.
However, taxpayers should not assume that premiums will decline in a particular year without reviewing the tax return, applicable thresholds, and current SSA/CMS rules.
IRMAA After the Death of a Spouse
The death of a spouse can materially change both the survivor's tax situation and potential Medicare IRMAA exposure.
A surviving spouse may eventually face:
A different federal filing status
Lower IRMAA income thresholds
Different federal income-tax brackets
Similar or only moderately lower retirement income
RMDs from inherited or existing retirement accounts
Changes in pension or Social Security income
This can create what is sometimes called a survivor tax effect: household income may decline after one spouse dies, but not necessarily in proportion to the reduction in available tax brackets or IRMAA thresholds.
Death of a spouse is also one of the life-changing events recognized by SSA for IRMAA purposes. When the applicable requirements are satisfied, the surviving spouse may be able to request a new determination based on changed circumstances.
The tax and Medicare consequences are highly fact-specific, so the survivor's filing status, projected income, retirement accounts, and applicable SSA procedures should be reviewed together.
IRMAA vs. Social Security Taxation
IRMAA and Social Security taxation can both be affected by retirement income, but they are different calculations.
Issue | Social Security Taxation | Medicare IRMAA |
|---|---|---|
What it affects | How much of Social Security benefits may be included in taxable income | Additional Medicare Part B and Part D premium amounts |
Income calculation | Combined/provisional income calculation under federal tax rules | IRMAA MAGI generally based on AGI plus tax-exempt interest |
Timing | Determined as part of the applicable tax year's federal income-tax calculation | Commonly based on tax-return information from two years before the Medicare premium year |
Potential result | Up to 85% of Social Security benefits may be included in taxable income | Beneficiary may pay additional Part B and/or Part D amounts |
Primary administration | IRS / federal income-tax system | Social Security Administration and Medicare/CMS |
The same transaction can potentially affect both calculations.
For example:
Roth conversion → higher AGI → potentially more taxable Social Security + potentially higher future IRMAA
However, the Social Security taxable-benefit thresholds are not IRMAA thresholds, and the percentage of Social Security benefits included in taxable income does not determine the beneficiary's IRMAA tier.
For a detailed discussion of Social Security taxation, see Is Social Security Taxable? How Federal Taxes on Benefits Work.
IRMAA vs. Net Investment Income Tax
Medicare IRMAA should also not be confused with the Net Investment Income Tax (NIIT).
NIIT is a federal tax imposed under Internal Revenue Code Section 1411 when applicable requirements are met. IRMAA is an income-related adjustment to Medicare Part B and Part D premiums.
Both can potentially be affected by income, but they use different calculations, thresholds, and rules.
A taxpayer could potentially be affected by:
NIIT
IRMAA
Both
Neither
depending on the taxpayer's income and circumstances.
Calling IRMAA a “Medicare investment tax” is therefore inaccurate.
Illustrative Planning Examples
These simplified examples illustrate how income decisions can affect IRMAA. They are for educational purposes and are not individual tax or Medicare calculations.
Example 1: Comparing Two Roth Conversion Amounts
Suppose a retiree is considering a Roth conversion and projects baseline MAGI near an IRMAA threshold.
A smaller conversion may keep projected MAGI within the current IRMAA tier, while a larger conversion may move the taxpayer into the next tier.
The comparison should include:
Federal income tax on each conversion amount
State income tax, if applicable
Potential Social Security tax interaction
Potential future Part B and Part D IRMAA
Effect on future RMDs and taxable retirement income
The larger conversion may still produce the more favorable multi-year result. The purpose of the projection is to identify the additional cost of crossing the threshold and compare it with the potential longer-term benefit.
Example 2: A Large Capital Gain
Suppose a retiree sells a substantially appreciated investment.
The gain increases adjusted gross income and may increase IRMAA MAGI. Under the normal lookback approach, the Medicare premium effect may occur approximately two years after the sale.
The taxpayer should therefore evaluate both the immediate tax consequences and the potential future Medicare premium effect before completing a controllable transaction.
Example 3: RMDs Increase Retirement Income
Suppose a retiree begins taking required minimum distributions from traditional retirement accounts.
The taxable RMD increases adjusted gross income and may push the retiree into a higher IRMAA tier for a later Medicare premium year.
Because an RMD generally cannot simply be skipped once required, the planning opportunity may have existed before RMDs began, when Roth conversions, earlier withdrawals, QCDs, and other strategies could potentially have been evaluated.
Example 4: Retirement Creates an SSA-44 Opportunity
Suppose a taxpayer had substantial wages two years ago, but has since retired and experienced a significant reduction in income.
Social Security may initially determine IRMAA using the earlier high-income tax return. Because a qualifying work stoppage or work reduction can be an SSA-recognized life-changing event, the taxpayer may be able to request a new determination if the applicable requirements are satisfied.
This is different from simply having a one-time Roth conversion or capital gain. A temporary high-income transaction does not automatically qualify as an SSA life-changing event.
Florence Tax LLC's IRMAA Tax-Planning Review
A tax-focused IRMAA review may include:
Establish Medicare timing. Identify who is currently enrolled in Medicare, who may become eligible soon, and the Medicare premium year being evaluated.
Identify the applicable tax-return year. Determine which federal tax return is expected to be used for the IRMAA determination under current SSA rules.
Project IRMAA MAGI. Estimate adjusted gross income and applicable tax-exempt interest using expected retirement income, RMDs, investment income, business or rental income, capital gains, and other relevant items.
Establish the baseline IRMAA result. Apply the appropriate filing status and current IRMAA thresholds and consider Part B and Part D for each applicable Medicare beneficiary.
Model controllable transactions. Test potential Roth conversions, discretionary IRA withdrawals, capital gains, business transactions, property sales, and other significant income events before they occur when possible.
Calculate the broader tax effect. Evaluate federal tax, Arizona or other applicable state tax, Social Security taxation, and potential IRMAA rather than examining any one consequence in isolation.
Compare multiple years. Consider future RMDs, expected income changes, filing status, survivor considerations, and other relevant factors when comparing alternatives.
Review SSA relief when applicable. If circumstances have changed, determine whether a recognized life-changing event or another SSA reconsideration procedure may be relevant.
Florence Tax LLC provides tax analysis and tax planning. Medicare enrollment, Medicare plan selection, insurance recommendations, investment management, and legal advice should be handled by the appropriate qualified professionals.
Common IRMAA Mistakes
Common IRMAA planning mistakes include:
Treating IRMAA as an income tax. IRMAA is an income-related Medicare premium adjustment, not an additional federal income tax.
Using taxable income instead of IRMAA MAGI. The IRMAA calculation generally begins with adjusted gross income and adds tax-exempt interest.
Ignoring tax-exempt interest. Interest that may be excluded from federal taxable income can still affect IRMAA MAGI.
Looking at the wrong tax year. Current Medicare premiums commonly reflect income reported approximately two years earlier.
Treating IRMAA tiers like progressive tax brackets. Crossing a threshold can move the beneficiary into another premium tier rather than applying a higher charge only to income above the threshold.
Ignoring the household Medicare situation. A married couple's joint income may determine the applicable tier, while IRMAA applies separately to each Medicare beneficiary based on the coverage each person has.
Ignoring Roth conversions, RMDs, capital gains, property sales, or business income. Significant income events can increase MAGI and potentially affect Medicare premiums in a later year.
Assuming all retirement-account distributions affect IRMAA the same way. Taxable traditional IRA distributions, qualified Roth IRA distributions, Roth conversions, and qualifying QCDs can receive different federal tax treatment.
Avoiding a potentially beneficial transaction solely because it crosses an IRMAA threshold. The additional Medicare cost should be compared with the transaction's broader multi-year tax consequences.
Assuming one high-income year creates permanent IRMAA. IRMAA is generally redetermined for each applicable premium year.
Assuming every income decline qualifies for IRMAA relief. SSA recognizes specific life-changing events and procedures; lower income by itself does not necessarily qualify.
Waiting until the IRMAA notice arrives to begin planning. For controllable transactions, the more useful time to estimate the Medicare effect is generally before the income event occurs.
Medicare IRMAA FAQs
What is Medicare IRMAA?
IRMAA is the Income-Related Monthly Adjustment Amount. Certain higher-income Medicare beneficiaries pay additional amounts associated with Medicare Part B and Part D premiums.
Is IRMAA a tax?
No. IRMAA is an income-related Medicare premium adjustment. Federal tax-return information is used to determine whether it applies, but IRMAA itself is not a federal income tax.
What income does Medicare use for IRMAA?
IRMAA generally uses modified adjusted gross income consisting of adjusted gross income plus tax-exempt interest under current SSA rules.
Why does IRMAA commonly look back two years?
Social Security generally uses the most recent federal tax-return information available from the IRS. In many cases, that means information from approximately two years before the Medicare premium year.
Do RMDs affect IRMAA?
Potentially. Taxable RMDs generally increase adjusted gross income and can increase IRMAA MAGI, potentially affecting Medicare premiums in a later year.
Do Roth conversions affect IRMAA?
Potentially. The taxable portion of a Roth conversion generally increases adjusted gross income in the conversion year and may affect IRMAA under the applicable lookback.
Do capital gains affect IRMAA?
They can. Capital gains included in adjusted gross income may increase IRMAA MAGI, even when the gain qualifies for preferential federal capital-gains tax rates.
Do qualified Roth IRA withdrawals affect IRMAA?
A qualified Roth IRA distribution is generally tax-free and not included in gross income, so it generally does not increase IRMAA MAGI. Nonqualified distributions require separate analysis.
Can IRMAA be appealed or reduced after retirement?
Potentially. SSA recognizes certain life-changing events, including qualifying work stoppage or work reduction. Eligibility depends on the taxpayer's circumstances and applicable SSA requirements; retirement does not automatically guarantee a reduction.
Is IRMAA permanent?
Not necessarily. IRMAA is generally redetermined for each applicable Medicare premium year. A one-time high-income event may affect a particular premium year without creating a permanent surcharge, while recurring high income can result in recurring IRMAA.
IRMAA Is a Cost to Model, Not Necessarily a Cost to Avoid
A narrow approach to IRMAA planning says:
Stay below the next IRMAA threshold at all costs.
A broader tax-planning approach asks:
What happens if I stay below the threshold?
What happens if I cross it?
What are the federal tax, state tax, Social Security, and Medicare consequences of each option?
How do those results compare over multiple years?
A Roth conversion, capital gain, property sale, or other transaction may create additional Medicare premiums and still produce a favorable overall result. In another situation, adjusting the timing or amount of a transaction may reduce IRMAA without materially changing the taxpayer's broader objective.
IRMAA should therefore be incorporated into the decision—not allowed to make the decision by itself.
The goal is not to avoid IRMAA at any cost. The goal is to know the cost before making the decision.
For a broader discussion of coordinating retirement income, Roth conversions, RMDs, Social Security, Medicare, and taxes over multiple years, see Retirement Tax Planning: What to Do Before You Retire.
Get Help With Medicare IRMAA Tax Planning
Medicare IRMAA can add another layer to decisions involving Roth conversions, RMDs, capital gains, property sales, business income, and other retirement-income events.
Florence Tax LLC helps retirees and pre-retirees evaluate these decisions by projecting taxable income, IRMAA MAGI, federal and Arizona taxes, and potential future Medicare premium effects as part of a broader multi-year tax-planning analysis.
The objective is not simply to stay below an IRMAA threshold. It is to understand the complete tax and Medicare cost of a decision before it is finalized.
Florence Tax LLC serves retirees in Prescott, Yavapai County, throughout Arizona, and nationwide through our virtual-first practice.
Florence Tax LLC provides tax preparation, tax planning, and tax advisory services. Medicare enrollment, Medicare plan selection, insurance recommendations, investment management, and legal advice are outside the scope of these services and should be addressed with the appropriate qualified professionals.
Disclaimer: This article is for general educational and informational purposes only and does not constitute individualized tax, legal, accounting, financial, investment, retirement, Medicare, Social Security, or insurance advice.
Medicare IRMAA calculations depend on factors including filing status, modified adjusted gross income, tax-exempt interest, Medicare enrollment, the applicable tax and premium years, and individual circumstances. Federal and state tax laws, Medicare premiums, IRMAA thresholds, Social Security Administration procedures, forms, and other guidance may change.
Florence Tax LLC does not guarantee that a particular Roth conversion, retirement-account distribution, capital-gain transaction, property sale, charitable distribution, business transaction, or other strategy will reduce taxes, avoid IRMAA, reduce Medicare premiums, or produce any particular result.
Florence Tax LLC provides tax analysis and tax-planning services and does not provide Medicare enrollment, Medicare plan-selection, insurance, investment-management, or legal advice. Those matters should be coordinated with the appropriate qualified professionals.
Reading this article or using information provided on this website does not create a professional-client relationship with Florence Tax LLC.
