RMD Planning: How to Calculate, Manage, and Reduce Required Minimum Distributions

Required minimum distributions feel like a tax bill you didn't agree to. Once they start, the IRS mandates you pull money out of your traditional IRA and 401(k) every year — taxed as ordinary income — whether you need it or not. The real problem isn't the RMD itself. It's the cascade: RMDs push up your provisional income, which makes more of your Social Security taxable, which can push you into an IRMAA Medicare surcharge tier. The window to do something about this closes at 73.

The new RMD ages (SECURE 2.0)

Under SECURE 2.0 (§107), your required beginning date depends on your birth year:¹

Accounts subject to RMDs: traditional IRAs, SEP-IRAs, SIMPLE IRAs, 401(k)s, 403(b)s, 457(b)s. The Roth IRA is the notable exception — it has no lifetime RMDs. Starting in 2024, Roth 401(k)s and Roth TSPs also eliminated lifetime RMDs (SECURE 2.0 §325).¹

How to calculate your RMD

The formula is straightforward: divide your account balance at December 31 of the prior year by the IRS Uniform Lifetime Table (Table III) divisor for your age in the current year.²

Table III divisors for ages 73–80:

Notice the trend: the divisor shrinks every year, so you're required to withdraw a larger percentage of a growing (or even flat) account. A $1.5M IRA at age 73 forces a $56,604 minimum withdrawal. By 80, that same account balance (if unchanged) would require $68,182. The percentage keeps rising.

The first-RMD timing trap

Your first RMD can be delayed until April 1 of the year after you reach your RMD start age. This sounds helpful — until you realize it creates a double-RMD year.

Example: You turn 73 in 2026. Your 2026 RMD can be delayed to April 1, 2027. But your 2027 RMD is due December 31, 2027. Result: two full RMDs in a single calendar year, both taxable as ordinary income in 2027. This can push you into a higher bracket, spike provisional income past the 85% Social Security tax threshold, and land you in an IRMAA surcharge tier — all at once.

For most retirees, taking the first RMD in the year it's due (not delaying to April 1) distributes the tax hit evenly.

The RMD tax cascade

The tax damage from an RMD isn't just the bracket rate on the distribution. It tends to compound through two other mechanisms:

1. Social Security provisional income multiplier

Your Social Security benefits become taxable based on "provisional income" — your adjusted gross income, plus tax-exempt interest, plus 50% of Social Security benefits. The thresholds haven't been indexed for inflation since 1984, so they catch nearly everyone.³

Worked example: You have a $1M IRA, turn 73, take a $37,736 RMD, and receive $28,000 in Social Security. Your provisional income is $37,736 + $14,000 (50% of SS) = $51,736. All of it is above $34,000, so 85% of your $28,000 SS — $23,800 — is taxable. Your total taxable income: $37,736 + $23,800 = $61,536, before any deductions.

Now compare that to a year before RMDs, where your only income is $28,000 SS. Provisional income: $14,000. Zero Social Security is taxable. The RMD didn't just cost you its own tax — it turned a large chunk of your Social Security into taxable income too.

2. IRMAA Medicare surcharges

Medicare Part B premiums are based on your modified adjusted gross income (MAGI) two years prior. The 2026 IRMAA first tier starts at $109,000 (single) / $218,000 (MFJ) — a $74.90/month surcharge per person on top of the base Part B premium. Each additional RMD dollar that crosses a tier threshold can cost thousands in annual Medicare surcharges.⁴

This is why the pre-RMD Roth conversion window matters so much: reducing the future IRA balance now means smaller RMDs at 73, which means lower provisional income, lower SS taxation, and better odds of staying below IRMAA cliffs.

Five strategies to manage RMDs

Strategy 1: Roth conversions before your RMD start age

Every dollar you convert from traditional IRA to Roth IRA before 73 is a dollar that will never generate a mandatory RMD. The math is compelling:

Example: You're 68 with a $1M traditional IRA. You convert $30,000/year for five years ($150,000 total), paying the conversion tax now in what's likely a lower bracket than you'll face post-RMD. At 73, your IRA is $850,000 instead of $1,000,000 (assuming flat growth for simplicity).

The conversion also reduces the future RMD compounding effect: smaller RMDs at 73 mean smaller RMDs at 75, 78, and 85. The benefit is cumulative.

The key variable is the conversion tax rate. You need to stay below the IRMAA cliff ($109K single / $218K MFJ in 2026) and ideally fill up the 22% bracket — but not spill into 24%. This is highly individual. See the full Roth conversion window guide for bracket-filling mechanics and IRMAA cliff avoidance.

Strategy 2: Qualified Charitable Distributions (QCDs)

If you're 70½ or older and charitably inclined, a QCD is the most tax-efficient way to give — and it reduces your RMD dollar-for-dollar.

In 2026, you can direct up to $111,000 from your IRA directly to a qualified charity.² That amount counts toward your RMD but does not count as taxable income — not even in the provisional income calculation for SS taxation. You don't deduct it (no itemizing needed), and it doesn't appear in adjusted gross income at all.

Example: $37,736 RMD. You direct $15,000 to your donor-advised alternative (must be a qualified 501(c)(3); donor-advised funds don't qualify). The remaining $22,736 is a normal taxable distribution. You've reduced provisional income by $15,000 — which in the worked example above keeps more SS benefit untaxed and may keep you below an IRMAA tier.

QCD rules: The transfer must go directly from the IRA custodian to the charity — you can't withdraw the cash and write a check yourself. One-time QCD elections to split-interest trusts are permitted with separate limits.

Strategy 3: The still-working exception

If you're still working for a current employer and don't own more than 5% of the company, you can delay RMDs from that employer's 401(k) until you retire. This does not apply to IRAs or prior-employer plans — only the current-employer plan. Rolling prior-employer 401(k)s into your current employer's plan (if the plan accepts rollovers) consolidates them under the still-working exception.

Strategy 4: QLAC — defer a portion to age 85

A Qualified Longevity Annuity Contract lets you use up to $200,000 of your IRA balance to purchase a deferred annuity that begins paying out at a future date (up to age 85).⁵ The amount invested in the QLAC is excluded from the IRA balance used to calculate RMDs — effectively deferring taxes on that portion until the annuity payments start.

This strategy trades current RMD reduction for guaranteed income later in retirement, which can be useful if longevity risk is a concern. It doesn't eliminate tax — it defers it to a period when your income (and potentially your rate) may be lower.

Strategy 5: Roll Roth 401(k) to Roth IRA before RMDs start

Starting in 2024, Roth 401(k)s and Roth TSPs have no lifetime RMDs (SECURE 2.0 §325). But prior to that change, employees who left jobs often had Roth 401(k) balances subject to RMDs. Even now, rolling a Roth 401(k) into a Roth IRA before the RMD start age ensures the money stays in a no-RMD environment permanently, gives you more investment flexibility, and keeps estate-planning options open (Roth IRAs pass to heirs with no income tax on growth).

Inherited IRA RMDs: the 10-year rule plus annual distributions

If you inherit a traditional IRA from someone who had already started RMDs, the rules changed significantly in 2024. Under T.D. 10001 (July 2024), most non-spouse beneficiaries must:⁶

• Take annual RMDs from the inherited IRA based on their own single life expectancy table, AND
• Drain the account completely by the end of the 10th year after the decedent's death.

This "10-year rule plus annual RMDs" applies when the decedent had already passed their required beginning date. If the decedent died before their RBD, beneficiaries must still drain the account in 10 years, but are not required to take annual distributions in years 1–9 (though most should for tax efficiency).

If you're the beneficiary of a large inherited IRA, the planning window is tight and the tax impact can be severe — especially if you're still working and in a high bracket during the 10-year draw-down period.

Your RMD reduction checklist

1. Know your gap years. How many years between now and age 73 (or 75)? That's your Roth conversion window.
2. Model your year-1 RMD. Divide your projected IRA balance at 72 by 26.5. Is that number, combined with SS and other income, going to push you above IRMAA cliffs?
3. Calculate how much to convert. Fill the 22% bracket without crossing into 24%, and stay below $109K MAGI (single) or $218K (MFJ) to avoid IRMAA.
4. Set up QCD if you're already giving to charity. Don't let another year pass giving after-tax dollars when QCDs deliver the same result pre-tax.
5. Check Roth 401(k) rollover. Roll any Roth 401(k) from prior employers to your Roth IRA to lock in no-RMD status permanently.