RMD & Retirement Withdrawal Calculator: Optimize Your Tax Strategy
A $1 million traditional IRA at age 73 triggers a first-year RMD of roughly $37,700 — fully taxable. By age 85, the annual RMD exceeds $62,000 even if your balance stays flat. Add Social Security and pension income, and you can land in the 22% or 24% bracket — plus trigger $1,100+/year in Medicare IRMAA surcharges. Strategic Roth conversions before RMDs begin can reduce this burden by tens of thousands over a lifetime.
Jon Ragsdale· Chief Investment & Policy Intelligence Officer
Published March 29, 2026
Reviewed by David Duley for factual accuracy, source quality, and clarity.
Required minimum distributions are where tax deferral turns back into taxable income. For many retirees, the issue is not the first RMD by itself. It is the cascade that follows when withdrawals stack on top of Social Security, pensions, and Medicare means testing.
That is why PRIA treats RMDs as a policy-risk topic. The rules around start ages, tax brackets, and Medicare surcharges can reshape retirement cash flow long after the saving phase is over.
Required Minimum Distributions force you to withdraw from traditional retirement accounts starting at age 73 or 75. Each withdrawal is taxable income — and can push you into higher tax brackets or trigger Medicare IRMAA surcharges. A Roth conversion ladder can reduce this burden. Enter your details to see the full picture.
How PRIA Approached This
This calculator was written by Jon Ragsdale and reviewed by David Duley. PRIA treats tools like this as household policy-risk explainers, not generic widgets. We separate current law from proposals when relevant, translate public rules into plain English, and present the output as an educational estimate rather than personalized advice.
Related Analysis
Related Calculators
Frequently Asked Questions
- What is a Required Minimum Distribution (RMD)?
- An RMD is the minimum amount you must withdraw each year from traditional IRAs, 401(k)s, and other tax-deferred retirement accounts once you reach the required age. The withdrawal is taxed as ordinary income.
- At what age do RMDs start?
- Under the SECURE 2.0 Act, RMDs begin at age 73 for people born 1951–1959, and age 75 for people born 1960 or later. Before SECURE 2.0, the age was 72 (and before the original SECURE Act, it was 70½).
- How is the RMD amount calculated?
- Divide your account balance as of December 31 of the prior year by the IRS Uniform Lifetime Table divisor for your age. At 73, the divisor is 26.5, so a $1,000,000 balance requires a $37,736 withdrawal. The divisor shrinks each year, forcing larger withdrawals.
- Do Roth IRAs have RMDs?
- No. Roth IRAs have no RMDs during the owner's lifetime. Roth 401(k)s were subject to RMDs before 2024, but SECURE 2.0 eliminated that requirement. This is a major advantage of Roth conversions.
- What is a Roth conversion ladder?
- A strategy of converting traditional IRA/401(k) funds to a Roth account over multiple years, typically during low-income years between retirement and RMD start. You pay tax on the conversion at current rates, but the money then grows and is withdrawn tax-free forever.
- What is IRMAA and how does it affect retirees?
- IRMAA (Income-Related Monthly Adjustment Amount) is a surcharge on Medicare Part B and Part D premiums for higher-income retirees. For 2026, surcharges begin at $109,000 MAGI (single) or $218,000 (MFJ). At the highest tier, the surcharge exceeds $6,800/year per person. IRMAA uses your tax return from 2 years prior.
- How do Roth conversions affect IRMAA?
- Roth conversions count as taxable income in the year of conversion, which can trigger IRMAA surcharges. Since IRMAA uses income from 2 years prior, a conversion at age 63 affects premiums at age 65. Plan conversions to stay below IRMAA thresholds when possible.
- What happens if I miss an RMD?
- The penalty for missing an RMD was reduced from 50% to 25% of the missed amount by SECURE 2.0 (and to 10% if corrected within 2 years). On a $40,000 RMD, that is still a $4,000–$10,000 penalty. Always take your RMD by December 31 (or April 1 of the year after you turn 73/75 for your first RMD).
- Can RMDs push Social Security benefits into taxation?
- Yes. RMD income counts toward the provisional income thresholds that determine Social Security taxation. Above $34,000 (single) or $44,000 (MFJ), up to 85% of Social Security benefits become taxable. This effectively creates a hidden marginal tax rate of 40%+ in the phase-in range.
- What is the optimal Roth conversion amount?
- The optimal amount depends on your current bracket, expected future brackets, IRMAA thresholds, and time horizon. A common strategy is to "fill up" the 12% or 22% bracket each year — converting just enough to reach the top of a bracket without spilling into the next one. This calculator compares several fixed-amount strategies to help you find the right range.
RMDs can push retirees into higher brackets and trigger IRMAA surcharges. See your year-by-year RMD projection and Roth conversion options.
Start Free Watch →RMD Retirement Calculator: The Short Answer
RMDs force taxable withdrawals from tax-deferred retirement accounts, and those withdrawals can raise more than your tax bill. They can also increase the taxable share of Social Security and trigger IRMAA surcharges. This page helps show the chain reaction, not just the withdrawal amount.
What Are Required Minimum Distributions?
RMDs are mandatory annual withdrawals from traditional IRAs, 401(k)s, 403(b)s, and other tax-deferred retirement accounts. The IRS requires them because you got a tax deduction when you contributed — now they want their share. Each withdrawal is taxed as ordinary income.
Under the SECURE 2.0 Act (2022), the RMD start age is:
- 73 for people born 1951–1959
- 75 for people born 1960 or later
Roth IRAs have no RMDs during the owner’s lifetime. Roth 401(k)s were subject to RMDs before 2024, but SECURE 2.0 eliminated that requirement.
The RMD Tax Trap
The problem isn’t the first year — it’s the compounding effect. Your traditional balance grows tax-deferred, but the IRS divisor shrinks each year, forcing larger and larger withdrawals. A $500,000 IRA at 73 requires about $18,250 in RMDs. By 85 (assuming 5% growth), the balance has grown to roughly $750,000 and the RMD is $47,000+. That income stacks on top of Social Security and pensions, potentially:
- Pushing you into a higher federal tax bracket
- Making up to 85% of your Social Security benefits taxable
- Triggering Medicare IRMAA surcharges ($1,100–$6,900/year)
The Roth Conversion Ladder Strategy
The window between retirement and RMD start is your lowest-income period — the ideal time to convert traditional funds to Roth. You pay tax on the conversion at today’s rates, but the money then grows tax-free forever. Every dollar converted reduces your future traditional balance and therefore your future RMDs.
The key is optimizing conversion amounts to “fill up” lower tax brackets without pushing into unnecessarily high ones. Converting $50,000/year in the 12% or 22% bracket is often better than converting nothing and being forced into the 24% bracket later via RMDs.
IRMAA: The Hidden Medicare Tax
Income-Related Monthly Adjustment Amounts (IRMAA) are surcharges added to Medicare Part B and Part D premiums when your Modified Adjusted Gross Income (MAGI) exceeds certain thresholds. CMS 2026 thresholds begin above:
- Single filers: surcharges begin at $109,000 MAGI
- Married filing jointly: surcharges begin at $218,000 MAGI
- At the highest tier ($500K+ single), the combined Part B + Part D surcharge is $572.80/month or $6,874/year per person
IRMAA uses your tax return from two years prior. A large Roth conversion at age 63 affects your Medicare premiums at age 65. Planning conversions with IRMAA thresholds in mind is critical.
Temporary BBB Senior Deduction (2025-2028)
For retirees age 65+, the OBBBA added a temporary $6,000 senior deduction (subject to AGI phase-outs). That can partially offset the tax bite from RMD income in the 2025-2028 window, but it is not permanent and should be modeled as a temporary tailwind.
Why Advance Planning Matters Here
RMD planning is valuable precisely because it happens before the RMD years begin. Once distributions start, flexibility narrows. That is why Roth conversions, bracket management, and Medicare threshold awareness matter most in the years just before the forced-withdrawal window opens.
What This Calculator Does
This calculator projects your RMDs year-by-year from your current age through 95, calculates the federal tax and IRMAA impact of each year, and compares five Roth conversion strategies to show which minimizes your total lifetime tax + IRMAA cost. It does not include state taxes, capital gains, or the Social Security taxation formula.
Related Analysis
- Social Security Break-Even Calculator — When should you start claiming?
- Social Security Tax Calculator — Model how RMD income can increase taxable benefits
- Medicare Premium Calculator — Your total Medicare costs including IRMAA
- Effective Tax Rate Calculator — What’s your real tax rate?
- Lifetime Tax Calculator — Total taxes over your lifetime