How Do Retirement Withdrawals Affect Medicare Premiums? (IRMAA Explained)

IRMAA stands for Income-Related Monthly Adjustment Amount. It's a surcharge added to your Part B premium and Part D premium when your income level places you in a higher tier. Think of it as a premium based add-on determined by what you earned-not what you're earning right now.

IRMAA is calculated individually. A married couple filing jointly can each be assessed the surcharge based on their shared MAGI. Two Part B surcharges in one household adds up fast.

Your adjusted gross income MAGI includes your federal adjusted gross income plus tax exempt interest and certain add-backs. For retirees, the typical components are pensions, IRA and 401(k) withdrawals, Roth conversions, capital gains, business sale proceeds, rental income, and part-time work.

For 2026, the first IRMAA bracket starts at MAGI above $109,000 for single filers and $218,000 for married filing jointly. In 2025, incomes above $106,000 trigger higher Part B premiums. These thresholds are recalculated annually by Social Security and CMS.

The tiered structure gets steep. In 2025, Part B premiums can reach $628.90 for incomes above $500,000. Part B premiums can increase to $628.90 for high earners at the top bracket. Part D IRMAA surcharges range from $14.50 to $91/month on top of your drug plan cost.

IRMAA affects about 8% of medicare recipients-but if you're a business owner or higher income professional, you're far more likely to cross those thresholds at some point in retirement.

Medicare uses a two-year lookback. Your 2024 federal tax return sets your 2026 IRMAA for both Part B and Part D. Financial moves you make today change premiums two years from now.

The internal revenue service shares your most recent processed return with the social security administration. SSA then determines whether each beneficiary pays a higher premium. If the IRS hasn't processed your latest return, SSA may use an older tax year and later adjust once updated data arrives.

Filing status matters. Married filing jointly provides higher thresholds. Single, divorced, or widowed filers hit surcharges at lower income. Filing separately while living together triggers especially harsh tiers-a MAGI above $109,000 can immediately land you in an elevated bracket.

Real-world example: A couple sells a rental property in 2024, realizing $300,000 in capital gains. In 2026, both spouses see higher premiums based on that one-time spike-even if 2025 and 2026 income is much lower. Withdrawals can affect Medicare premiums two years later in exactly this way.

Amending a tax return can change your MAGI and potentially produce a reduction in IRMAA, but you must notify SSA and provide documentation to trigger a recalculation. A tax-aware retirement income strategy coordinates your tax return, investment income, and medicare premiums rather than treating them as separate decisions.

Many higher income retirees are surprised when normal retirement activities-RMDs, portfolio rebalancing, a business exit-push them into a higher IRMAA bracket, raising medicare premiums for at least one taxable year.

Income sources that feed into MAGI and can trigger higher premiums include:

• Social security benefits (taxable portion)

• IRA and 401(k) withdrawals

• Pension payments

• Brokerage dividends and capital gains

• Sale of a business or practice

• Rental income and consulting fees

Required minimum distributions from large pre-tax accounts can steadily increase based on account size in your seventies and eighties, pushing MAGI higher each year. Withdrawals from retirement accounts can affect future premiums significantly for high-net-worth households.

A large one-time transaction-like a $200,000 roth conversion in 2024-might temporarily bump a retiree into a higher Part B and Part D IRMAA tier for 2026, even if regular monthly retirement income is modest.

Compare two retirees: one with steady $150,000 MAGI every year faces continuous surcharges. Another with $80,000 MAGI most years but occasional large capital gains faces sporadic surcharges. Both pay IRMAA, but in different patterns. Withdrawal timing from taxable accounts versus IRAs can either bunch income into a single year or smooth it across multiple years to stay under a preferred threshold.

IRMAA is not always avoidable for higher-income households, but intentional tax and income planning can often reduce the total years or total money you pay in higher medicare premiums.

Tax-efficient withdrawal sequencing: Draw from taxable accounts in early retirement, coordinate Social Security claiming age, and moderate pre-tax withdrawals to keep yearly MAGI below specific IRMAA thresholds.

Partial Roth conversions: In lower-income years-especially the window between retirement and age 73 when RMDs start-strategic Roth conversions can reduce later RMDs and future IRMAA exposure. Roth account withdrawals do not count toward taxable income once converted, which is the payoff. The near-term IRMAA increase based on the conversion is a trade-off worth modeling.

Qualified charitable distributions (QCDs): After age 70½, QCDs from IRAs satisfy RMDs without increasing MAGI-potentially keeping you below an IRMAA threshold if you're charitably inclined.

Business owners: Coordinate the timing of a business sale or buyout. Installment payments spread proceeds over multiple years to avoid triggering the top IRMAA tier in a single year. Integrated business and personal planning is equal parts tax strategy and premium management.

Annuities and defined benefit plans: These can manage taxable income timing during peak earning years, though later withdrawals still count toward MAGI and must be modeled carefully.

Revolutionary Wealth runs multi-year tax and income projections showing how different decisions-Roth conversions, pension start dates, Social Security claiming, annuity purchases-change both your after-tax cash flow and your Part B monthly premium and Part D costs, supported by the firm’s specialized retirement planning team.

IRMAA is not set in stone. If your current income is significantly lower than the income on the tax return Medicare used, you may be able to appeal for a lower premium.

The social security administration recognizes specific life changing event categories: retirement or work stoppage, marriage, divorce, death of a spouse, loss of pension income, or loss of employer income.

The process involves completing Form SSA-44, providing evidence of the event (retirement letter, death certificate, etc.), and estimating your current-year MAGI. If you disagree with the income data SSA used-say you amended your return or the IRS made a reporting error-you may need to provide the amended return and work with the IRS first.

Beneficiaries generally have 60 days from receiving their IRMAA determination notice to appeal. Late appeals can sometimes be accepted with good cause. Don't assume it's too late without checking.

Revolutionary Wealth doesn't file appeals on your behalf but helps clients gather tax documents, estimate current-year income, and coordinate with their CPA so the appeal is accurate and consistent with their broader tax plan.

Even if an appeal isn't successful, IRMAA is recalculated annually. A temporary surcharge does not lock in higher premiums for life if your retirement income declines later.

Social Security claiming age, Medicare enrollment timing, and retirement income choices are deeply interconnected. Optimizing one without the others can unintentionally increase based your medicare premiums.

Delaying Social Security to age 70 increases monthly benefits and opens a window of lower-income years ideal for Roth conversions or capital gains harvesting before IRMAA becomes a concern. Once benefits start, premiums-including IRMAA surcharges-are deducted automatically from monthly checks, which can make higher premiums feel more painful because they reduce net deposits.

For women, single, divorced, or widowed clients: changes in filing status, survivor benefits, and household income after losing a spouse can significantly affect IRMAA exposure. A shift from joint to single thresholds can trigger surcharges at lower total income than before.

Coordinating RMDs with Social Security start dates matters. Delaying Social Security while drawing strategically from pre-tax accounts can shrink future RMDs-and the IRMAA risk they create.

High-net-worth households may benefit from integrating estate and legacy planning with IRMAA management through gifting strategies, trust planning, or charitable vehicles that shift future income streams off their own tax return.

As an independent financial advisor firm, Revolutionary Wealth integrates tax planning, investment management, Social Security timing, and Medicare premium projections into a single retirement income strategy rather than treating each decision in isolation.

These FAQs address common concerns about timing, temporary income spikes, and planning around IRMAA.