Medicare Premium Jumped Because of IRMAA (Income Surcharge)

What This Means

The letter behind your higher premium is an IRMAA determination — an income-related monthly adjustment amount that Social Security adds to your Medicare Part B (and Part D) premium because the modified adjusted gross income on your tax return from 2 years ago was over $109,000 (individual return) or $218,000 (joint return). For 2026 that means your income on your 2024 return moved your Part B premium from the standard $202.90 a month to between $284.10 and $689.90, depending on the bracket (CMS 2026 fact sheet). If your income has dropped since that tax year because of a life-changing event — retirement is the most common — do one thing today: file Form SSA-44 asking Social Security for a new determination based on your current income.

If your income has not dropped but the number Social Security used is wrong — you filed an amended return, the IRS data had an error, or a more recent return is available — call Social Security at 1-800-772-1213 instead (SSA). And if you simply disagree with the determination, you can request a formal reconsideration within 60 days of receiving the letter (SSA appeals).

This is a premium decision made by Social Security, not a claim denial from Medicare or your plan — your coverage itself is not affected, and the dispute runs through SSA rather than the Medicare claims appeal system. Roughly 8% of people with Medicare Part B pay an IRMAA (CMS).

Why This Happens

• Medicare looks two years back. The 2026 surcharge is calculated from your 2024 tax return — the return the IRS supplies to Social Security under the program’s two-year lookback. Nobody asks whether that income still reflects your life. If you retired in 2025 or 2026, Social Security is billing your retirement-era premium off your working-era income until you tell it otherwise.
• The brackets are cliffs, not a slope. Crossing a threshold by a single dollar moves the entire premium to the next tier — the first step alone adds $81.20 a month.
• A one-time income spike counts just like salary. Anything that raised your 2024 modified adjusted gross income — capital gains, large retirement-account withdrawals, a final year of full-time earnings — can push you over a bracket for all of 2026.
• The notice arrives on its own schedule. Social Security determines IRMAA from IRS data automatically and notifies you near the end of each year about the upcoming year’s premium (HHS OMHA). If your premium is deducted from a Social Security benefit, the change shows up as a smaller monthly deposit.

How the 2026 IRMAA Brackets Work

Your total 2026 Part B premium by income bracket (CMS 2026 fact sheet):

If you are married filing separately and lived with your spouse during the year, different brackets apply — the surcharge jumps straight to the two highest tiers above $109,000; see the CMS fact sheet for those rows.

The same brackets add a Part D surcharge of $14.50 to $91.00 per month in 2026 on top of whatever your drug plan charges. The Part D amount is paid to Medicare — deducted from your Social Security benefit or billed to you directly — not to your plan (CMS).

Should You Appeal?

What To Do Next

1. Read the determination letter. It is an “initial determination” from Social Security, and it names the tax year and income figure used. Confirm which bracket that figure lands in using the table above — bracket errors are worth catching before anything else.
2. Pick your path. Income dropped after a life-changing event → SSA-44. Tax data wrong or outdated → correction call. Neither, but you still disagree → formal reconsideration.
3. Life-changing event: file Form SSA-44. Submit it online by signing in at SSA’s IRMAA page, or fax or mail the paper form to your local Social Security office with evidence of the event and your lower income — for example, a letter from your employer about your retirement date, plus your more recent tax return or an estimate of this year’s income.
4. Amended return or IRS error: call 1-800-772-1213. Tell the representative you want your IRMAA reviewed because you filed an amended return, or because the IRS data Social Security used was wrong or has been superseded by a newer return (SSA).
5. Disagree entirely: request reconsideration within 60 days of receiving the letter — online, by calling Social Security, or by submitting Form SSA-561-U2 (SSA appeals). If the reconsideration goes against you, the next level is a hearing before an administrative law judge at HHS’s Office of Medicare Hearings and Appeals (OMHA).
6. Keep paying the billed premium while you dispute it. A successful SSA-44 or appeal recalculates what you owe. If your income has dropped far enough, also check whether you now qualify for help paying Medicare costs — see our Extra Help guide.

Sources

• CMS: 2026 Medicare Parts A & B Premiums and Deductibles — the $202.90 standard premium, the full 2026 Part B IRMAA bracket tables, the Part D IRMAA amounts ($14.50–$91.00), and the roughly-8% figures.
• Medicare.gov: Medicare costs — the higher premium applies when MAGI on your IRS tax return from 2 years ago exceeds $109,000 (individual) / $218,000 (joint) in 2026.
• SSA: Request to lower an Income-Related Monthly Adjustment Amount (IRMAA) — life-changing events, filing SSA-44 online or by fax/mail with evidence, and the amended-tax-return phone path.
• SSA: Form SSA-44 (PDF) — Medicare Income-Related Monthly Adjustment Amount — Life-Changing Event.
• SSA: Request reconsideration — the 60-day deadline after receiving a decision and Form SSA-561-U2.
• HHS Office of Medicare Hearings and Appeals: Medicare Part B Premium Appeals — the appeal ladder (SSA reconsideration first, then OMHA), the qualifying situations for a new determination, and IRMAA’s one-year-at-a-time application.

Frequently Asked Questions