If your 2024 MAGI was $300,000 and you file single / head of household, here's exactly what you pay for Medicare in 2026 — and how close you are to the next bracket.
Quick answer: At $300,000 (single / head of household), your 2026 Medicare Part B premium is $649.20/mo and Part D IRMAA is $83.30 + plan/mo — about $6,355 extra per year above the standard premium. IRMAA is a per-bracket cliff set by your 2024 MAGI; if your income later dropped from a life-changing event, you can appeal with Social Security form SSA-44.
At $300,000 (single / head of household), you're in 2026 IRMAA tier 4 of 5, so you pay $649.20/month for Part B — that's $446.30/mo more than the standard $202.90 — plus a $83.30/month Part D IRMAA surcharge added on top of your drug plan. Together that's about $6,355 in extra Medicare cost this year versus someone below the first threshold ($109,000). IRMAA is a cliff, not a slope: one dollar over a bracket triggers the full higher amount.
Your 2024 MAGI of $300,000 sits $94,999 into tier 4 (which begins at $205,001). The next IRMAA cliff is at $500,000 — so you have about $200,000 of headroom before your premium jumps to the next tier. If your income tends to vary year to year, that headroom is the number to watch: cross it on your 2024 return and the higher 2026 premium applies for the full year.
If a life-changing event — retirement, work stoppage, divorce, or the death of a spouse — reduced your 2024 MAGI below $205,001, you'd move down to tier 3 and save roughly $1,735 per year in 2026. You request that recalculation with form SSA-44 and proof of the event; Social Security can use a more recent or estimated year instead of 2024. Even without a qualifying event, income planning (Roth-conversion timing, QCDs from an IRA, harvesting gains in a lower year) is how people manage which side of $205,001 they land on.
This page covers $300,000 (single / head of household). Use the free calculator for any income and filing status, plus the full bracket table and how to appeal with form SSA-44.
Open the 2026 IRMAA Calculator →Yes. $300,000 (single / head of household) is over the first 2026 IRMAA threshold ($109,000), so an income surcharge applies on both Part B and Part D.
Your 2024 Modified Adjusted Gross Income (MAGI) — adjusted gross income plus tax-exempt interest. Social Security uses a two-year lookback, so your 2026 premium is set by the income on your 2024 tax return.
Yes. If a life-changing event (retirement, divorce, death of a spouse, loss of income) lowered your income, file form SSA-44 to have IRMAA recalculated — dropping below $205,001 in MAGI would save about $1,735/yr here. You can also manage MAGI with Roth-conversion timing, QCDs, and capital-gains timing.
Run IRMAA for your whole book + print SSA-44 appeal language with the IRMAA Calculator & Appeal Toolkit.
See the agent tools on Etsy →2026 IRMAA figures are verified against U.S. government primary sources: