Why is my Medicare premium so high? — IRMAA explained

Income-Related Monthly Adjustment Amount. It's an income-based surcharge that stacks on top of standard Medicare Part B and Part D premiums when your income passes a threshold. The 2026 starting brackets are $109,000 for singles and $218,000 for joint filers. Above those, IRMAA increases through five brackets, with the highest topping out for incomes over $500K single / $750K joint.

The tax return from TWO years before the IRMAA year. So your 2026 IRMAA is calculated from your 2024 tax return. The income figure they use is your Modified Adjusted Gross Income (MAGI) — which is generally your AGI plus tax-exempt interest. SSA pulls the figure from IRS data.

Five brackets above the standard. Single filer brackets: $0 IRMAA up to $109,000; then four bracketed increases through about $205K, $171K, $137K, and finally $500K+. Joint filer brackets are roughly double the single ones, starting at $218,000. The exact 2026 IRMAA dollar amounts are published in CMS's annual fact sheet — see the source link in the verified facts on this page.

Yes — if a life-changing event applies. SSA recognizes 8 life-changing events: marriage, divorce/annulment, death of spouse, work stoppage, work reduction, loss of income-producing property, employer pension plan stoppage/scheduled cessation, and employer pension plan settlement payment. File Form SSA-44 within 60 days of your IRMAA notice. SSA recalculates using more current income.

60 days from the date of your IRMAA notice. The notice usually arrives in November or December for the following year. If you miss the 60-day window, file anyway with a 'good cause' explanation. SSA accepts late filings in many cases, but the cleanest path is filing on time.

No — generally a one-year spike from a Roth conversion, home sale, RMD, or business sale doesn't qualify as an SSA-44 event. The eight events are tied to ongoing changes in earning capacity (retirement, spouse death, divorce, pension stoppage), not single-year transactions. The bright side: IRMAA is reset every year, so the surcharge falls off the year after the high-income return drops out of the 2-year lookback.

Yes. Part D IRMAA is calculated separately and stacks on top of your Part D plan's premium. The income brackets are the same as Part B IRMAA. If your IRMAA notice shows a Part D adjustment but you don't have Part D, the bill goes away once SSA confirms you're not enrolled. If you do have Part D, the surcharge is paid to Medicare directly (separate from the plan premium you pay to the insurer).

If you collect Social Security, IRMAA is deducted from your benefit each month along with the standard Part B premium. If you don't collect Social Security yet, Medicare bills you directly via the Medicare Premium Bill (Form CMS-500) every quarter or every month. Set up Medicare Easy Pay (auto-debit) to avoid missing a payment.

Not directly. IRMAA is based on tax-return MAGI, not on whether you've started Social Security. But the timing of when SS benefits land can shift the years that show high income. SS benefits are partially taxable depending on provisional income, so the year you start SS can change MAGI for that and later years. This is one reason claiming-strategy decisions and IRMAA planning often get discussed together.

Be careful. Real IRMAA appeals go through SSA on Form SSA-44 (free) or through the SSA reconsideration and ALJ appeal process (free). If a stranger calls and offers to lower your IRMAA for a fee, that's typically either fraud or a marketing funnel into something else. Cold-call solicitation about Medicare-related products is prohibited under CMS's Medicare Communications and Marketing Guidelines (MCMG). For free, unbiased help: SSA at 1-800-772-1213, SHIP at 1-877-839-2675.