Medicare’s infamous “2-year lookback” rule means the government calculates your monthly Part B premium using your tax return from two years ago — so in 2026, Medicare is looking at your 2024 income. If that year included a one-time spike in earnings, such as a Roth conversion, a home sale, or a large retirement withdrawal, you could be paying hundreds of dollars more per month in what’s called an IRMAA surcharge (Income-Related Monthly Adjustment Amount) — even if your income is far lower today. The good news: you can appeal, plan ahead, and in many cases get those surcharges reduced or eliminated entirely.

What Exactly Is the Medicare 2-Year Lookback Rule?

Every year, Medicare sets your Part B and Part D premiums based on your Modified Adjusted Gross Income (MAGI) from two years prior. MAGI is essentially your total income before most deductions — it includes wages, investment gains, Social Security benefits, and yes, Roth conversions.

For 2026, Medicare is reviewing your 2024 tax return. If your income crossed certain thresholds, you’re subject to IRMAA — an extra charge added on top of the standard premium. The standard Medicare Part B premium for 2025 was $185.00 per month. With IRMAA surcharges, that number can climb to over $600 per month per person, depending on your income bracket. In 2026, those thresholds have been adjusted for inflation, but the structure remains the same.

Here’s the kicker: even a single unusual event — selling a rental property, taking a large IRA distribution, or converting a traditional IRA to a Roth — can push you into a higher IRMAA bracket for a full 12 months.

How Much Does IRMAA Actually Cost Retirees?

IRMAA surcharges are tiered by income. For 2026, individuals with MAGI above roughly $106,000 (or couples above $212,000) begin paying extra. The surcharges stack up quickly:

  • Tier 1: A few hundred dollars extra per year
  • Tier 2–4: Surcharges can add $1,000 to $4,000+ per person, per year to your Medicare costs

For a married couple who both triggered a higher bracket due to a one-time Roth conversion in 2024, the combined extra cost in 2026 could easily exceed $6,000. That’s money most retirees would rather keep in their pocket.

Can You Appeal an IRMAA Surcharge?

Absolutely — and this is the step too many retirees skip. The Social Security Administration (SSA), which administers IRMAA, allows you to request a review if you’ve experienced a “life-changing event” that significantly reduced your income since that lookback year. Qualifying events include:

  • Marriage, divorce, or death of a spouse
  • Retirement or reduction in work hours
  • Loss of income-producing property (such as a rental property destroyed in a disaster)
  • Loss of pension income

To appeal, you file Form SSA-44 with your local Social Security office. You’ll need to provide documentation of the life-changing event and your more recent income. If approved, Medicare will use a more recent tax year — or even a current income estimate — to recalculate your premium. Many retirees who successfully appeal see their surcharges drop or disappear within a few months.

Note: A Roth conversion or voluntary large withdrawal does not qualify as a life-changing event for IRMAA appeal purposes. That’s why planning before you trigger income spikes is so critical.

How Do You Avoid IRMAA Surcharges in the First Place?

The best time to think about IRMAA is before you make financial moves that boost your income. Here are the strategies that smart retirees use:

1. Spread Roth conversions over multiple years. Instead of converting a large traditional IRA balance in a single year, convert smaller amounts across several years to stay below IRMAA income thresholds.

2. Time your Required Minimum Distributions (RMDs) carefully. Under current RMD rules for 2025 and 2026, you must begin taking distributions from traditional IRAs and most 401(k)s at age 73. These distributions count toward your MAGI. Work with a financial advisor to model how RMDs will affect your Medicare premiums two years down the road.

3. Use Qualified Charitable Distributions (QCDs). If you’re 70½ or older, you can donate up to $105,000 per year directly from your IRA to a qualifying charity. QCDs satisfy your RMD but don’t count toward your taxable income — which means they don’t push you into a higher IRMAA bracket.

4. Consider the timing of asset sales. If you’re planning to sell a vacation home or investment property, consider whether the gain can be spread across tax years or offset with losses elsewhere in your portfolio.

5. Check your income two years out, every year. Make it a habit to estimate your MAGI for the current year and project what your Medicare premium will be two years from now. A little foresight can save thousands.

How Does Social Security Claiming Age Interact With This Trap?

Here’s a connection many retirees miss: when you claim Social Security affects both your benefit amount and your IRMAA exposure. If you claim Social Security early (as young as 62), your benefits are permanently reduced — by up to 30% compared to waiting until your full retirement age (FRA), which is 67 for most people born after 1960. Delaying until age 70 can increase your benefit by 8% per year beyond FRA.

But here’s the IRMAA angle: up to 85% of your Social Security benefit is taxable income, depending on your combined income. That means larger Social Security checks — especially if paired with RMDs and investment income — can push you over IRMAA thresholds. Planning the right Social Security claiming age isn’t just about maximizing your lifetime benefit; it’s also about managing your Medicare costs in retirement.

What Should You Do Right Now?

If you received an IRMAA notice for 2026 and believe it’s based on an unusually high-income year, file Form SSA-44 as soon as possible. If you haven’t received a notice but made large financial moves in 2024, pull your tax return now and check where your MAGI landed relative to the IRMAA thresholds.

And if you’re still in the planning phase — perhaps in your late 50s or early 60s — this is the perfect time to build a retirement income strategy that keeps your Medicare costs as low as possible for decades to come. The 2-year lookback trap catches thousands of retirees off guard every year. Now that you know how it works, you don’t have to be one of them.

Frequently Asked Questions

Frequently Asked Questions

When should I claim Social Security to maximise my benefit?

For most people, delaying Social Security until age 70 provides the highest lifetime benefit — your monthly payment grows by roughly 8% for each year you delay past your full retirement age (67 for those born after 1960). However, the right time depends on your health, other income sources, and how Social Security income will affect your Medicare IRMAA bracket, so run the numbers with a financial planner before deciding.

How much of Social Security is taxable?

Up to 85% of your Social Security benefit may be subject to federal income tax, depending on your “combined income” (adjusted gross income plus non-taxable interest plus half your Social Security benefit). If your combined income exceeds $34,000 as a single filer or $44,000 as a couple, 85% of benefits are taxable. This taxable portion also counts toward the MAGI used for Medicare IRMAA calculations.

What are the RMD rules for 2025 and 2026?

Under current law, you must begin taking Required Minimum Distributions (RMDs) from traditional IRAs and most employer retirement plans at age 73. There is no RMD requirement for Roth IRAs during the original owner’s lifetime. RMD amounts are calculated each year based on your account balance and IRS life expectancy tables, and failing to take the full RMD triggers a 25% excise tax on the amount not withdrawn.

How do I avoid Medicare IRMAA surcharges?

The most effective strategies include spreading Roth IRA conversions across multiple years to stay below income thresholds, using Qualified Charitable Distributions (QCDs) to satisfy RMDs without increasing taxable income, and carefully timing large asset sales. If your income dropped significantly due to a qualifying life-changing event, you can appeal your IRMAA surcharge by filing Form SSA-44 with the Social Security Administration.

What is the Medicare Part B premium for 2025?

The standard Medicare Part B premium for 2025 was $185.00 per month. Higher-income beneficiaries pay more due to IRMAA surcharges, with premiums ranging up to over $600 per month depending on income. In 2026, the standard premium has been adjusted for inflation — check Medicare.gov or your annual Medicare notice for the most current figures.