Question 1

What is IRMAA?

Accepted Answer

IRMAA stands for Income-Related Monthly Adjustment Amount. It's a per-bracket surcharge on top of the standard Medicare Part B and Part D premiums for higher-income beneficiaries. The brackets are based on your MAGI from two years prior — your 2025 IRMAA is determined by your 2023 tax return.

Question 2

Why is IRMAA called a cliff?

Accepted Answer

IRMAA brackets are not phased in — being one dollar over a threshold triggers the entire higher surcharge for the full year, for both spouses on Medicare. A retiree converting just enough Roth to push MAGI from $105,999 to $106,001 (single, 2025) pays roughly $1,050 more in Medicare premiums for the year. This calculator shows headroom to the next cliff and the cost of crossing.

Question 3

How can I avoid an IRMAA cliff?

Accepted Answer

Common strategies: time large Roth conversions to stay just under a threshold; spread capital-gains realizations across multiple years; defer non-essential IRA distributions; use qualified charitable distributions (QCDs) to lower MAGI; coordinate with your spouse's claiming and conversion timing. Watch the lookback window — your IRMAA depends on income from two years ago.

IRMAA Bracket Avoider

Your MAGI

Current Bracket

Headroom to Next Cliff

Cost of Crossing

Monthly Surcharge (now)

Annual Surcharge (now)

Total Annual Medicare

IRMAA Bracket Map

All Brackets