Educational analysis only, not tax advice; all figures reflect tax year 2026 unless a different year is labeled inline.
TL;DR — Quick Verdict
- A $1,200,000 traditional IRA balance produces a first-year RMD of $45,283 at age 73, using the IRS Uniform Lifetime Table divisor of 26.5.
- The forced withdrawal floor climbs from 3.77% of balance at 73 to 4.07% at 75, 4.95% at 80, and 8.20% at 90 — the tax problem accelerates with age.
- Missing an RMD costs a 25% excise tax on the shortfall under 26 U.S.C. §4974, cut to 10% if corrected within the IRS correction window.
- Crossing the 2026 IRMAA threshold of $109,000 (single) or $218,000 (joint) by one dollar adds $1,148 per person in Medicare Part B surcharges — a cliff, not a phase-in.
- A qualified charitable distribution of up to $111,000 satisfies the RMD without adding a dollar to adjusted gross income, making it the single most efficient tool for charitably inclined retirees.
- Recommendation: model your age-73 through age-85 RMD path now, and use the pre-73 window for Roth conversions if projected RMDs will push you past a bracket or IRMAA line.
Roughly 8% of Medicare Part B beneficiaries pay an income-related surcharge, according to the Centers for Medicare & Medicaid Services — and required minimum distributions are one of the most common reasons a retiree who never earned six figures suddenly does. The math is unforgiving. Once you hit age 73, the IRS stops letting your traditional IRA or 401(k) compound untaxed, and the withdrawal is calculated whether you need the cash or not.
Most retirees learn the RMD formula and stop there. That is the cheap half of the problem. The expensive half is what the distribution does downstream: bracket creep, Social Security taxation, and Medicare premium cliffs that trigger two years later. Fidelity, Vanguard, and Schwab all publish RMD calculators that give you the withdrawal number — none of them price the surcharge.
This article does three things: it walks the exact 2026 divisor math with worked balances from $250,000 to $2,000,000; it prices the total tax cost of an RMD at each bracket using IRS Revenue Procedure 2025-32 thresholds; and it compares the two main mitigation strategies head to head with a verdict. Every figure comes from IRS Publication 590-B, Rev. Proc. 2025-32, or the CMS 2026 premium release.
How the 2026 RMD Calculation Actually Works
Two inputs produce the number. Take your account balance as of December 31 of the prior year, then divide it by the distribution period divisor the IRS assigns to your attained age for the current year. That divisor comes from the Uniform Lifetime Table in IRS Publication 590-B, Appendix B, Table III — unchanged since 2022.
Age 73 carries a divisor of 26.5. Divide any balance by 26.5 and you get a withdrawal floor of 3.77%. That percentage is the number that matters, because it tells you whether your portfolio is outrunning the requirement. A retiree earning 6% on a balanced portfolio at age 73 is still growing the account after the RMD — which means the tax bill in ten years will be larger, not smaller.
The divisor shrinks by roughly 0.9 to 1.0 per year. By 85 it is 16.0. By 90 it is 12.2. That compression is deliberate, and it is why retirement withdrawal strategy comparison matters more in your late sixties than at any other point.
Divisors from IRS Publication 590-B, Appendix B, Table III. Withdrawal floor and dollar columns derived by Real Cost Report, holding balance constant at $1,200,000. IRS Publication 590-B.
Hold the balance constant and the required withdrawal still more than doubles between 73 and 90. Add investment growth and the gap widens further. Note that this table assumes the Uniform Lifetime Table applies; if your sole beneficiary is a spouse more than ten years younger, Table II produces a smaller distribution.
What an RMD Actually Costs You in Federal Tax
Distributions from pre-tax accounts are ordinary income. There is no preferential rate, no capital gains treatment, and no exclusion — only basis you already paid tax on comes out free.
Consider a married couple, both 73, filing jointly in 2026. They collect $52,000 in Social Security benefits, hold $18,000 in taxable interest and dividends, and take a $45,283 RMD from a $1,200,000 IRA. Their standard deduction is $32,200 under Revenue Procedure 2025-32, plus $1,650 per qualifying spouse aged 65 or older, plus the OBBBA senior deduction of $6,000 per qualifying taxpayer, which phases out at a 6% rate above $150,000 of joint income.
Run the stack. With provisional income well above the joint threshold, 85% of Social Security becomes taxable, adding $44,200. Gross income reaches $107,483. After deductions totaling roughly $47,500, taxable income lands near $59,983 — squarely inside the 22% joint bracket, which runs from $100,800 to $211,400 of taxable income in 2026. The marginal rate on the last RMD dollar is 22%; the effective federal rate across the whole return is closer to 11%.
The distinction matters. Every dollar of RMD you eliminate saves 22 cents, not 11 — which is exactly why Roth conversion costs and timing should be modeled against your marginal rate, never your average one.
RMDs derived by Real Cost Report using the age-73 divisor of 26.5 from IRS Publication 590-B. Marginal rates from IRS Revenue Procedure 2025-32. Figures model federal tax on the distribution alone at the stated marginal rate and exclude state income tax. IRS Rev. Proc. 2025-32.
The IRMAA Cliff Most Retirees Never See Coming
Federal income tax is the visible cost. The Medicare surcharge is the one that ambushes people, because it arrives two years after the income that caused it.
CMS set the standard 2026 Part B premium at $202.90 per month. Above $109,000 of modified adjusted gross income for a single filer, or $218,000 for a joint filer, the income-related monthly adjustment amount attaches. Total monthly Part B premiums for affected beneficiaries range from $284.10 to $689.90, with Part D surcharges running $14.50 to $91.00 on top.
Here is the design flaw. There is no phase-in. One dollar over $218,000 of joint modified adjusted gross income triggers the full first-tier surcharge for both spouses, for all twelve months. The first-tier jump costs a couple $2,297 per year in combined Part B and Part D surcharges; moving from tier one to tier two adds another $3,475.
Because Medicare uses a two-year lookback, your 2026 premium reflects your 2024 return. An RMD taken in 2026 sets your 2028 premium. That lag is what makes proactive modeling valuable and reactive correction nearly impossible — a point covered in depth in our analysis of IRMAA surcharge impact on retirement income.
Thresholds and premiums published by the Centers for Medicare & Medicaid Services on November 14, 2025, effective January 1, 2026. Amounts are per beneficiary; a couple where both spouses are enrolled pays each amount twice. Centers for Medicare & Medicaid Services (verify at cms.gov).
Qualified Charitable Distribution vs. Roth Conversion: Which Is Better for a Retiree Facing Large RMDs?
Two tools dominate the mitigation conversation, and they solve different problems.
A qualified charitable distribution moves money directly from an IRA to a 501(c)(3) charity. The 2026 limit is $111,000 per individual, or $222,000 for a married couple where both spouses have IRAs, per the Congressional Research Service. The distribution counts toward the RMD but never enters adjusted gross income, which means it sidesteps bracket creep, Social Security taxation, and the IRMAA threshold simultaneously. Eligibility begins at 70½ — three years before RMDs start.
A Roth conversion does the opposite in the short run. You deliberately accelerate income, pay tax now at a known rate, and permanently remove the converted balance from the RMD calculation. The cost is real: a $100,000 conversion at a 24% marginal rate costs $24,000 in federal tax, and if it pushes 2026 modified adjusted gross income past $218,000 joint, it also buys a 2028 IRMAA surcharge.
Neither is universally superior. The deciding variable is whether you have charitable intent and whether you have a low-income window before RMDs begin. Retirees weighing the account-type question more broadly should read our comparison of Roth versus traditional IRA by tax bracket.
Verdict
If you already give to charity, the qualified charitable distribution wins outright — it delivers a full deduction-equivalent benefit even for standard-deduction filers, and under the One Big Beautiful Bill Act’s 0.5% AGI floor on itemized charitable deductions, its relative advantage widened in 2026. Roth conversion is the better tool for non-charitable retirees who retire before 73 and have a multi-year window of unusually low taxable income. Retirees with both charitable intent and a low-income gap should sequence them: convert aggressively between retirement and 73, then switch to qualified charitable distributions once RMDs begin.
What Most People Get Wrong About RMDs
Five errors account for most of the avoidable cost. Each has a specific, correctable fix.
Mistake one: aggregating 401(k) accounts the way you aggregate IRAs. Traditional IRA RMDs can be totaled and taken from any single IRA. Employer plan RMDs cannot — each 401(k) must distribute its own. The consequence is a shortfall subject to the 25% excise tax under 26 U.S.C. §4974. Correct action: calculate and withdraw plan-by-plan, or consolidate old employer plans into one IRA before the year you turn 73.
Mistake two: delaying the first distribution to April 1 without modeling it. The IRS permits a first-year delay to April 1 of the following year. Do it and you take two distributions in one calendar year — potentially doubling the income spike that drives an IRMAA determination. Correct action: delay only when the following year’s income is verifiably lower.
Mistake three: donating cash and claiming a deduction instead of using a qualified charitable distribution. With the 2026 standard deduction at $32,200 for joint filers, most retirees do not itemize, so the cash gift produces no tax benefit at all. Correct action: route the gift through the IRA custodian directly, up to $111,000.
Mistake four: ignoring the December 31 prior-year balance rule. Your 2026 RMD is fixed by your December 31, 2025 balance. A market decline in 2026 does not reduce it. Correct action: build a cash or short-duration reserve so you are never forced to sell equities into weakness to meet the requirement.
Mistake five: assuming Roth 401(k) balances require distributions. They no longer do during the owner’s lifetime, following the SECURE 2.0 change. Correct action: verify your plan administrator has updated its records, since some still issue distribution notices in error.
Who Should Act Before Age 73 — and Who Can Skip It
Not every retiree needs a mitigation strategy. Screening takes about ten minutes.
Act now if your combined pre-tax balances exceed roughly $1,000,000 and you are within ten years of your applicable age. At that level a first-year distribution of $37,736 stacks on top of Social Security and pension income, and the cumulative path through age 85 is what drives the surcharge risk. The threshold drops to about $700,000 if you also collect a defined benefit pension — see our analysis of defined benefit pension value versus a 401(k) for how guaranteed income compounds the problem.
Act now if you are retired and under 73 with taxable income temporarily below the top of the 12% bracket. That window is the cheapest conversion opportunity you will ever have, and it closes permanently once distributions and Social Security both switch on. Coordinating this with Social Security claiming age decisions is where most of the value sits.
You can reasonably skip aggressive planning if your total pre-tax balance is under $400,000, producing an age-73 distribution near $15,000. At that scale the distribution rarely moves your marginal rate and almost never approaches the IRMAA line. Focus instead on sequence-of-returns risk in early retirement, which will cost you far more.
Still accumulating? The most valuable action is directional: shift marginal savings toward Roth vehicles now. Our guidance on catch-up contribution limits after 50 and 401(k) contribution limits covers where those dollars should land.
Frequently Asked Questions
What is the penalty if I miss my RMD entirely?
The excise tax is 25% of the shortfall under 26 U.S.C. §4974, reduced to 10% if you correct the failure within the IRS correction window. That is already a major improvement — before SECURE 2.0, the penalty was 50%, according to the Congressional Research Service. You report and request a waiver on IRS Form 5329, and the IRS has historically granted relief for reasonable-cause errors that are promptly corrected.
Do Roth IRAs require minimum distributions?
No. The IRS confirms that withdrawals from Roth IRAs and designated Roth accounts in 401(k) and 403(b) plans are not required during the account owner’s lifetime. Beneficiaries who inherit either account type are subject to distribution rules. This asymmetry is the structural reason a Roth conversion permanently shrinks the future RMD base rather than merely deferring it.
Can I still contribute to an IRA while taking RMDs?
Yes, provided you have earned income. The SECURE Act removed the age cap on traditional IRA contributions. One caution: contributing to a traditional IRA after age 70½ can reduce the excludable portion of a subsequent qualified charitable distribution under an anti-abuse offset rule, so retirees planning to use the $111,000 QCD allowance should weigh the interaction before contributing.
Does a QCD count toward my required minimum distribution?
Yes. A qualified charitable distribution satisfies the requirement dollar for dollar, up to the 2026 limit of $111,000 per individual. If your distribution is $45,283 and you direct the full amount to a qualified charity, the requirement is met and none of it enters adjusted gross income. Fidelity notes that a QCD exceeding the current-year requirement does not carry forward to future years.
How We Researched This Article
Every distribution figure in this article was calculated from primary IRS source data rather than reproduced from secondary summaries. Distribution period divisors come from IRS Publication 590-B, Appendix B, Table III — the Uniform Lifetime Table, in effect for distribution years 2022 forward under Treasury Decision 9930. We verified the applicable age of 73 and the two-distribution first-year rule directly against IRS retirement plan guidance at the IRS RMD FAQ page, and the statutory excise tax structure against Congressional Research Service publication IF12750, available at Congress.gov.
Bracket thresholds, standard deduction amounts, and senior deduction figures were verified against IRS Revenue Procedure 2025-32, issued October 9, 2025, with cross-reference to the Tax Foundation’s 2026 bracket analysis for the One Big Beautiful Bill Act interactions. The 2026 qualified charitable distribution limit of $111,000 was confirmed through Congressional Research Service publication IF11377. Medicare premium and surcharge figures come from the Centers for Medicare & Medicaid Services release dated November 14, 2025.
A distinction between measured and modeled figures matters here. Divisors, thresholds, premiums, and statutory limits are measured — published values copied verbatim. Dollar distributions, withdrawal floor percentages, and the illustrative joint-filer scenario are modeled by Real Cost Report using those inputs, and the derivation is shown in each table caption.
Three limitations apply. First, all tax modeling is federal only; state treatment of retirement distributions varies widely and several states exempt them entirely. Second, the joint-filer scenario assumes 85% Social Security inclusion, which will not hold for lower-income households. Third, the divisor tables assume the Uniform Lifetime Table governs; retirees whose sole beneficiary is a spouse more than ten years younger use Table II and will see lower distributions than shown. Research conducted July 2026.
All figures were verified against named primary sources before publication.