RMDs and Medicare Premiums: How Required Minimum Distributions Affect IRMAA

Every dollar you withdraw from a traditional IRA or 401(k) as a required minimum distribution counts toward IRMAA MAGI — the number that sets your Medicare Part B and Part D surcharges. Unlike wages that stop at retirement, RMDs tend to grow, quietly pushing more retirees into higher premium brackets year after year.

How RMDs flow into IRMAA MAGI

IRMAA MAGI = your AGI + tax-exempt interest (Form 1040 Lines 11 + 2a). Distributions from traditional IRAs and 401(k)s, including RMDs, are ordinary income and enter AGI in full. There is no netting, exclusion, or favorable rate — unlike long-term capital gains, which at least have a preferential tax rate even as they count fully toward IRMAA.

The two-year look-back makes timing critical: your 2026 Medicare premiums are set by your 2024 MAGI. RMDs you take today will flow into your 2028 Medicare bills. If you're currently 70–72 (pre-RMD), you have a window to reduce future RMD exposure through Roth conversions before distributions become mandatory.

The compounding problem: RMDs grow as divisors shrink

The IRS Uniform Lifetime Table assigns a declining divisor each year — meaning a larger percentage of your account must be distributed as you age. If your portfolio grows even modestly, the combination of a smaller divisor and a larger base can push RMDs significantly higher from year to year.

Example: a 73-year-old with a $1.5M traditional IRA earning 5%/year:

Assumes 5% annual return; 2026 IRMAA brackets used throughout (actual future brackets will be inflation-adjusted upward).

RMD-to-IRMAA projection calculator

Enter your details to see your current RMD, projected IRMAA tier, and how the picture changes over the next five years.

Strategy 1: Qualified Charitable Distributions — the cleanest IRMAA offset

A qualified charitable distribution (QCD) is a direct transfer from your IRA to a qualified charity. It never enters your AGI — it doesn't appear as income on your tax return at all. For someone who must take RMDs and supports charitable causes anyway, directing IRA funds to charity as a QCD is effectively a no-cost way to reduce IRMAA MAGI.

In 2026, QCDs can offset up to $111,000 per person per year — indexed for inflation starting in 2024 under SECURE 2.0.² For a married couple, that's a potential $222,000 of IRA withdrawal that bypasses MAGI entirely. Key rules:

• You must be age 70½ or older to use QCDs (three years before most people hit RMD age)
• The transfer goes directly from your IRA custodian to the charity — you cannot receive the check and then donate
• QCDs count toward your RMD for the year (so you satisfy the distribution requirement without the income hit)
• Eligible charities: 501(c)(3) public charities — not donor-advised funds, private foundations, or supporting organizations
• Only applies to the pre-tax balance; if you have non-deductible IRA contributions, a portion of each QCD may be non-deductible-basis-free

Strategy 2: Pre-RMD Roth conversions — reduce RMDs at the source

Each dollar you convert from a traditional IRA to Roth before RMD age reduces the future balance subject to mandatory distributions. Once converted, qualified Roth distributions never count in IRMAA MAGI. The compounding benefit: a smaller RMD balance means smaller RMDs for the rest of your life, not just one year.

The optimal Roth conversion window for most people is roughly ages 63–72:

• Before 63: Conversions count toward MAGI, but the two-year look-back doesn't affect your Medicare premiums yet (you're not on Medicare)
• Ages 63–72: Conversions do hit your Medicare premiums two years later — but you have full control over how much you convert and can stay below bracket cliffs
• At RMD age: The mandatory RMD must be distributed first; only amounts above the RMD can be converted. The RMD itself isn't convertible — it must come out as income first

The question is how much to convert and in which years. The right answer depends on your current bracket, projected RMD growth, Social Security timing, and the IRMAA cliff structure. This is the core of what a specialist models across multiple future years. See Roth Conversions and IRMAA for bracket cliff tables and worked conversion examples.

Strategy 3: Don't stack capital gains in RMD years

If you're already taking RMDs, be careful about layering additional income realizations on top of them. A $60,000 RMD might keep you in IRMAA Tier 1 on its own. But realize $40,000 in long-term capital gains the same year (perhaps from a taxable account rebalance or property sale), and you may cross the Tier 2 floor — adding $2,886/year in surcharges per person for the two following years. Since the IRMAA look-back is two years, one year of poor stacking has a multi-year premium impact.

RMD start ages under SECURE 2.0

SECURE 2.0 (2022) raised the RMD starting age in two steps:⁴

The later RMD start age for those born in 1960+ creates a longer pre-RMD conversion window. A 65-year-old born in 1961 has 10 years before mandatory distributions begin — potentially one of the most valuable Roth conversion windows in retirement planning history, especially given current IRMAA bracket structure.

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