Medicare question
Which tax year does Medicare use to calculate IRMAA?
Medicare uses your income from two years prior to calculate IRMAA. For example, your 2025 Medicare premiums are based on your 2023 tax return.
Where this answer comes from, and what it can't tell you
Written from the published Medicare rules and the source material preserved for this question. It explains the topic in general terms. It is not a reading of your own coverage documents, not a prediction of how Medicare or a plan will decide a case, and not advice about a particular plan. Your current notice, policy, Evidence of Coverage, or formulary controls when it differs from a general explanation. Resting Sycamore is not Medicare.gov and is not endorsed by any government agency.
What determines the answer to “Which tax year does Medicare use to calculate IRMAA”?
Medicare uses your income from two years prior to calculate IRMAA. For example, your 2025 Medicare premiums are based on your 2023 tax return.
Which details can change the answer to “Which tax year does Medicare use to calculate IRMAA”?
IRMAA stands for Income-Related Monthly Adjustment Amount. It's an extra charge added to your Medicare Part B and Part D premiums if your income exceeds certain thresholds. The Social Security Administration handles this calculation, and they use the most recent federal tax return they have on file, which is typically two years old.So if you're enrolling in Medicare in 2025, SSA is looking at your 2023 adjusted gross income. If that income was above the threshold (which changes annually), you'll pay a higher premium. The surcharge is tiered, meaning the more you earned, the higher the added cost.This creates a real-world problem for people who recently retired or had a one-time income spike. Maybe you sold a rental property, took a large 401(k) distribution, or sold a business in 2023. Even if your 2024 and 2025 income are much lower, SSA still sees that 2023 number and applies the surcharge.The good news is you can appeal an IRMAA determination if your income has dropped significantly due to a qualifying life event, like retirement, divorce, or the death of a spouse. This is called a Life Changing Event appeal, and you file it using SSA Form SSA-44. It's worth doing if your current income genuinely doesn't reflect what SSA is using.
For you, this means a high-income year two years ago can raise your Medicare premiums today, but if your income has dropped since then due to retirement or another major life change, you have options to appeal and potentially lower what you pay.
What should you verify before acting on “Which tax year does Medicare use to calculate IRMAA”?
Check the current premium, deductible, copayment, coinsurance, and annual out-of-pocket limit that apply to the coverage being considered. Amounts and income thresholds can change from one year to the next.
Where should you look next?
What else do people ask about determines the answer to “Which tax year does Medicare use to calculate IRMAA”?
- What is IRMAA and how much can it add to my Medicare costs?
- Can I appeal IRMAA if my income dropped?
- Does selling a house, Roth conversion, or taking RMDs affect IRMAA?
- Do all doctors accept Medicare?
- Is COBRA considered active employer coverage for Medicare purposes?
- How can I confirm that my hospital is in a Medicare Advantage plan's network?
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