There's a tax consequence to your Required Minimum Distributions that doesn't show up on your income tax return. It shows up on your Medicare bill. Every year, Medicare Part B and Part D premiums for the following year are set based on your income from two years prior. The Social Security Administration uses your Modified Adjusted Gross Income — your AGI with a few additions — to determine whether you pay the standard premium or a higher surcharge called IRMAA. IRMAA stands for Income-Related Monthly Adjustment Amount. It's a surcharge layered on top of your regular Medicare premiums when your
The timing mechanism is what surprises most people. Your 2026 Medicare premiums are based on your 2024 income. Your 2027 premiums are based on your 2025 income. The SSA uses information from your filed tax return — typically available about two years before the premium year. This means that a large RMD in 2024 — perhaps because you delayed your first distribution to take advantage of the April 1 grace period and ended up with two RMDs in the same year — will increase your Medicare premiums in 2026. By the time the premium notice arrives, the income event that caused it is already 24 months in the past. The two-year lag also means that proactive planning must happen well in advance. You're not managing 2026 IRMAA in 2026. You're managing it in 2024.
2026 MAGI Part B Part D Additional (Single) Premium Surcharge** Annual Cost vs. Baseline** ≤ $109,000 $202.90/mo $0 $0 $109,001 $284.10/mo $14.50/mo ~$1,148/yr $137,000 $137,001 $405.80/mo $37.50/mo ~$2,884/yr $171,000 $171,001 $527.50/mo $60.40/mo ~$4,582/yr $205,000 $205,001 $649.20/mo $83.30/mo ~$6,355/yr $499,999 ≥ $500,000 $689.90/mo $91.00/mo ~$6,932/yr Source: CMS 2026 Medicare Part B and Part D premium tables. MAGI thresholds are based on income reported two years prior. Married filing jointly thresholds are approximately double the single filer amounts at each tier. To put those numbers in context: a retiree with a $600,000 traditional IRA will have an annual RMD of approximately $22,600 at age 73. If their other income — Social Security, a pension, investment income — already puts them near $100,000, that single RMD could cross the first IRMAA threshold and add $1,148 in Medicare costs per year. The RMD is taxed as ordinary income and also generates a Medicare surcharge. Both costs must be factored in when evaluating the true cost of a distribution.
Because IRMAA is an AGI problem — not just an income tax problem — the tools that reduce taxable income are also Medicare management tools. The two most commonly used are QCDs and pre-RMD Roth conversions. A Qualified Charitable Distribution reduces AGI directly. Rather than taking your RMD and donating the proceeds to charity (which requires itemizing to get any tax benefit), a QCD moves the money directly from your IRA to a qualified 501(c)(3) organization. The distribution never enters your AGI — which means it has no effect on your IRMAA calculation. For a retiree who gives regularly to charity and whose RMD would otherwise push them into a higher IRMAA tier, the QCD can eliminate that surcharge entirely. Roth conversions work on a different timeline — the years before RMDs begin rather than during them. By reducing the balance in your traditional IRA before you reach your RMD start age, you reduce how much the IRS will eventually require you to withdraw each year. Smaller RMDs mean lower AGI. Lower AGI means reduced IRMAA exposure in the years that follow.
IRMAA is based on a fixed two-year look-back, which can produce results that don't reflect your current financial situation. If your income in the look-back year was unusually high because of a one-time event — a business sale, a large Roth conversion, the death of a spouse — you can appeal to the Social Security Administration to use more recent income data. The appeal form is SSA-44, titled 'Medicare Income-Related Monthly Adjustment Amount — Life-Changing Event.' Qualifying events include retirement, marriage, divorce, the death of a spouse, loss of pension income, or reduction in income due to work stoppage. If your situation qualifies and you can provide documentation, the SSA can adjust your surcharge based on a more recent tax year. This is not a guarantee — it requires documentation and a qualifying event. But for retirees who experienced a one-time income spike two years ago that no longer reflects their current income, it's a real option that most people are never told exists. **Your RMD affects more than your tax bracket. A CPA can show you whether your projected distributions put you at risk of an IRMAA surcharge — and what to do before the income year closes.**
IRMAA is a cliff — not a ramp. If your income lands $1 over a tier|When IRMAA adds to your Medicare costs, it's charged as a monthly|Many retirees don't even realize the deduction is happening or|IRMAA is to look at the letter from Medicare/SSA that arrives each
CMS 2026 Medicare Part B and Part D premium tables. MAGI