IRMAA Medicare Surcharge Calculator

The 2025 IRMAA thresholds are set by the Centers for Medicare and Medicaid Services (CMS) and are adjusted annually for inflation. Here are the key breakpoints for each filing status:

Single / Head of Household filers:

• $106,000 or less — No surcharge (standard premiums only)
• $106,001 to $133,000 — $74.00/month Part B + $13.70/month Part D surcharge
• $133,001 to $167,000 — $185.00/month Part B + $35.30/month Part D surcharge
• $167,001 to $200,000 — $295.90/month Part B + $56.90/month Part D surcharge
• $200,001 to $500,000 — $406.90/month Part B + $78.50/month Part D surcharge
• Above $500,000 — $443.90/month Part B + $85.80/month Part D surcharge

Married Filing Jointly:

• $212,000 or less — No surcharge
• $212,001 to $266,000 — Tier 1 surcharge
• $266,001 to $334,000 — Tier 2 surcharge
• $334,001 to $400,000 — Tier 3 surcharge
• $400,001 to $750,000 — Tier 4 surcharge
• Above $750,000 — Tier 5 (maximum) surcharge

Married Filing Separately has a compressed bracket structure with only three tiers, and the thresholds are much lower. This filing status is particularly punitive for IRMAA purposes, jumping to Tier 4-equivalent surcharges at just $106,001 of MAGI.

At the highest tier, a single person pays an additional $529.70/month ($6,356/year) in combined Part B and Part D surcharges. For a married couple both on Medicare at the top tier, that is $12,713/year in extra premiums.

Roth conversions are one of the most powerful retirement tax strategies, but they come with an IRMAA trap that many financial plans overlook. Every dollar you convert from a traditional IRA to a Roth IRA adds to your MAGI, which can push you into a higher IRMAA tier.

The interaction between Roth conversions and IRMAA:

• Roth conversions are taxable income — The converted amount is added to your AGI and therefore your MAGI. A $50,000 Roth conversion is treated the same as $50,000 in wages for IRMAA purposes.
• Two-year delay — A Roth conversion done in 2025 will affect your IRMAA in 2027. Many retirees forget about this lag and are surprised when premiums jump.
• The cliff makes partial conversions critical — Because IRMAA is a cliff, converting $1 more than the threshold costs you the full surcharge for the next tier. Strategically sizing your conversion to stay just below the next cliff can save thousands.

Best practices for Roth conversion + IRMAA planning:

• Calculate your headroom first — Use this calculator to find your Roth conversion room. That is the maximum additional income you can add before crossing into the next IRMAA tier.
• Multi-year conversion strategy — Instead of converting a large lump sum, spread conversions across multiple years to stay below IRMAA thresholds each year.
• Consider the breakeven — Sometimes it makes sense to accept a higher IRMAA tier if the long-term Roth tax savings exceed the 1-2 years of extra surcharges. This depends on your age, expected longevity, and future tax rates.
• Pre-Medicare window — If you retire before age 65, the years between retirement and Medicare enrollment are a golden window for aggressive Roth conversions since IRMAA does not apply yet (though it will catch up via the 2-year lookback).

A well-planned multi-year Roth conversion strategy that respects IRMAA cliffs can save tens of thousands in combined income taxes and Medicare surcharges over a retirement.

The definition of MAGI for IRMAA is slightly different from the MAGI used for other tax provisions. For IRMAA, your MAGI equals your Adjusted Gross Income (AGI) plus any tax-exempt interest income (primarily municipal bond interest). This is reported on your tax return.

Income sources that increase your IRMAA MAGI:

• Wages and self-employment income — Any earned income, including part-time work in retirement
• Taxable Social Security benefits — Up to 85% of your Social Security can be included in AGI depending on your total income
• Pension and annuity income — Taxable distributions from employer pensions
• Traditional IRA/401(k) distributions — Required minimum distributions (RMDs) and voluntary withdrawals
• Roth conversions — The full converted amount is added to AGI
• Capital gains — Both short-term and long-term, including gains from selling a home above the exclusion
• Rental income — Net rental income after deductions
• Tax-exempt interest — Municipal bond interest is added on top of AGI for IRMAA (but not for most other tax calculations)

Income sources that do NOT count:

• Roth IRA distributions — Qualified Roth withdrawals are tax-free and do not appear in AGI
• Return of basis from non-deductible IRA contributions — The non-taxable portion of a traditional IRA withdrawal
• Life insurance proceeds — Generally received income-tax-free
• Gifts and inheritances — Not included in income for tax purposes
• Health Savings Account (HSA) distributions — When used for qualified medical expenses

This is why Roth accounts are so valuable in retirement: Roth distributions do not increase your MAGI and therefore cannot trigger IRMAA surcharges, making them the ideal source for large one-time expenses.

Yes, you can appeal. Because IRMAA uses income from two years prior, it can be inaccurate if your financial situation has changed significantly. The Social Security Administration (SSA) allows you to request a reconsideration using Form SSA-44 (Medicare Income-Related Monthly Adjustment Amount Life-Changing Event).

Qualifying life-changing events for an IRMAA appeal:

• Marriage or divorce — A change in filing status can move you to different thresholds
• Death of a spouse — Loss of a spouse changes your filing status and often your income level
• Work stoppage or reduction — Retirement, layoff, or reduction in hours that significantly reduces income
• Loss of income-producing property — Such as sale of a business or rental property that inflated income in the lookback year
• Loss of pension income — If a pension was terminated or reduced
• Employer settlement payment — A one-time settlement that inflated income in the lookback year

What does NOT qualify:

• Investment losses — A stock market decline is not a qualifying event
• Voluntary Roth conversions — A large Roth conversion that you chose to make is not a life-changing event
• One-time capital gains — Selling appreciated stock or real estate at a profit is generally not a qualifying event unless related to loss of income-producing property

To file an appeal, complete Form SSA-44 and bring it to your local Social Security office or mail it in. You will need documentation showing the life-changing event and your estimated current-year income. If approved, your IRMAA is recalculated using more recent income data.

Capital gains are one of the most common triggers for unexpected IRMAA surcharges, especially for retirees who sell appreciated assets or downsize their home. Both short-term and long-term capital gains are included in your AGI, and therefore in your MAGI for IRMAA purposes.

Key scenarios to watch:

• Home sale gains — The capital gains exclusion ($250,000 for single filers, $500,000 for married filing jointly) shields a significant portion of home sale profit. However, gains above the exclusion are added to MAGI. If you sell a home for $1.2 million that you bought for $400,000, a married couple would have $300,000 in taxable gain ($800,000 profit minus $500,000 exclusion). That single transaction could push you into a top IRMAA tier for two years.
• Portfolio rebalancing — Selling appreciated positions to rebalance your portfolio generates capital gains. Retirees who rebalance in a single year can accidentally trigger IRMAA. Spreading rebalancing across multiple years, or using losses to offset gains, can help.
• Concentrated stock positions — Selling a large concentrated stock position (common with former executives who hold company stock) can create a massive one-year MAGI spike.
• Mutual fund capital gain distributions — Even if you did not sell any shares, your mutual fund may distribute capital gains at year-end that increase your AGI. Actively managed funds are particularly prone to this.

Mitigation strategies:

• Tax-loss harvesting — Offset gains with losses to reduce net capital gains
• Installment sales — Spread a large asset sale across multiple years to keep MAGI below thresholds
• Charitable giving — Donate appreciated assets directly to charity to avoid recognizing the gain
• Qualified Opportunity Zones — Defer or reduce capital gains through QOZ investments

Always model the IRMAA impact before executing a large sale. The two-year delay means you need to plan ahead, not react after the fact.

IRMAA applies surcharges to both Medicare Part B (outpatient medical insurance) and Medicare Part D (prescription drug coverage), but the amounts and mechanics differ. Both surcharges use the same MAGI thresholds and the same two-year lookback period.

Part B IRMAA:

• Larger surcharge — Part B surcharges are significantly larger than Part D, ranging from $74.00/month at Tier 1 to $443.90/month at the highest tier in 2025
• Deducted from Social Security — The surcharge is automatically deducted from your Social Security check. If you do not receive Social Security, CMS will bill you directly.
• Applies to everyone on Part B — Whether you have Original Medicare or a Medicare Advantage plan, the Part B surcharge is the same

Part D IRMAA:

• Smaller surcharge — Part D surcharges range from $13.70/month to $85.80/month in 2025
• Paid to your plan or billed by CMS — The Part D surcharge may be added to your monthly plan premium or billed separately by Medicare
• Applies even with employer coverage — If you are enrolled in a Medicare Part D plan (including Medicare Advantage with drug coverage), the surcharge applies. If you have creditable employer drug coverage and are not enrolled in Part D, the surcharge does not apply.

Total impact example (single filer, Tier 2): At MAGI of $140,000, you would pay $185.00/month in Part B surcharge plus $35.30/month in Part D surcharge, for a total of $220.30/month or $2,643.60/year in extra premiums above what someone earning $105,000 would pay.

The Married Filing Separately (MFS) filing status is particularly punitive under the IRMAA rules. CMS designed the MFS brackets with far fewer tiers and much lower thresholds, effectively penalizing couples who file separately.

How MFS brackets differ:

• Only 3 tiers instead of 6 — MFS filers jump from no surcharge directly to a Tier 4-equivalent surcharge at $106,001 of MAGI. There is no gradual ramp.
• Threshold is half of MFJ — The first threshold for MFS is $106,000, compared to $212,000 for Married Filing Jointly. But the surcharge amount is the same.
• Massive cliff — Going from $106,000 to $106,001 of MAGI triggers $406.90/month in Part B surcharges and $78.50/month in Part D surcharges. That is $5,824.80/year in extra premiums for $1 of additional income.

When MFS might still make sense:

• Income-driven student loan repayment — Some borrowers file separately to reduce their AGI for IDR plan calculations, even though it triggers higher IRMAA
• Liability protection — In cases where one spouse has significant tax liabilities or compliance issues
• One spouse has very low income — If one spouse has MAGI under $106,000, filing separately could protect that spouse from IRMAA while the higher-earning spouse pays the surcharge

In nearly all retirement scenarios, Married Filing Jointly is the better choice for IRMAA purposes. The joint thresholds are exactly double the single thresholds, and the bracket structure provides a much more gradual ramp. Always model both filing statuses before deciding.

While you cannot avoid IRMAA entirely if your income is high enough, there are several legitimate strategies to manage your MAGI and minimize the surcharge, especially when you are close to a threshold boundary.

Income timing and control strategies:

• Manage Roth conversion amounts — Convert only up to the point that keeps you below the next IRMAA cliff. Use this calculator to find your exact conversion room before year-end.
• Harvest capital losses — Offset gains with losses before year-end to reduce net capital gains included in AGI
• Bunch income into alternating years — If you have discretionary income (like part-time consulting), you may be able to shift it between tax years. Being in Tier 1 every other year is better than being in Tier 1 every year if you can consolidate income into one year and keep the other year below the base threshold.
• Qualified Charitable Distributions (QCDs) — If you are 70.5 or older, donate up to $105,000/year directly from your IRA to charity. QCDs satisfy your RMD without being included in AGI, directly reducing your MAGI.
• Charitable remainder trusts — A CRT can spread income from a large asset sale over many years, keeping annual MAGI more predictable

Asset location strategies:

• Draw from Roth accounts — Roth IRA and Roth 401(k) distributions do not count toward MAGI. Building Roth assets before Medicare enrollment gives you a tax-free income source that does not trigger IRMAA.
• Use cash value life insurance — Loans from permanent life insurance policies are not taxable income and do not count toward MAGI (though this strategy has its own costs and trade-offs)
• Hold tax-efficient investments in taxable accounts — Index funds, ETFs, and tax-managed funds generate fewer capital gain distributions than actively managed funds

Planning calendar: Review your projected MAGI in October or November each year. At that point, you still have time to execute tax-loss harvesting, make charitable contributions, or adjust Roth conversion amounts before December 31.

Social Security benefits and Required Minimum Distributions (RMDs) both contribute to your MAGI and can push you into higher IRMAA tiers. Understanding the interaction is essential for retirement income planning.

Social Security and IRMAA:

• Taxable portion counts — Up to 85% of your Social Security benefits can be included in your AGI, depending on your combined income. For most retirees with other income sources, 85% of Social Security is taxable and counts toward IRMAA MAGI.
• Circular calculation — Roth conversions increase your income, which can increase the taxable portion of Social Security, which further increases your MAGI. This ripple effect is sometimes called the Social Security tax torpedo.
• IRMAA surcharges are deducted from Social Security — Your Part B premium (including IRMAA) is automatically withheld from your Social Security check, reducing your net monthly benefit

RMDs and IRMAA:

• RMDs are fully taxable income — Traditional IRA and 401(k) distributions are included in AGI at 100% of the distribution amount
• RMDs grow over time — As you age, the RMD percentage increases. A large traditional IRA balance can force RMDs that exceed IRMAA thresholds even without any other income action.
• QCDs reduce IRMAA exposure — Qualified Charitable Distributions (QCDs) satisfy your RMD without being included in AGI. For charitably inclined retirees, QCDs are one of the most effective IRMAA reduction strategies.
• SECURE 2.0 changes — The starting age for RMDs is now 73 (rising to 75 in 2033). This gives more years for Roth conversions before RMDs begin.

Planning insight: The years between retirement and age 73 (or 75) are often the lowest-income years of retirement. This is the prime window for Roth conversions because you can control your MAGI before RMDs force additional taxable income.