Roth Conversions Before RMDs: The 60–73 Window

Between retirement and the year your first RMD is required, most retirees are in their lowest tax bracket since their 20s. It's temporary. Once RMDs start, the IRS sets your taxable income floor for the rest of your life. The conversions you do in this window are the single most powerful lever in retirement tax planning — but only if you use them strategically.

Why the Pre-RMD Years Are Different

When you stop earning a paycheck and haven't yet claimed Social Security or started RMDs, your taxable income often drops to near zero. A couple with $2M in a traditional IRA, a $40,000 pension, and no earned income might have taxable income of $7,800 in a year — paying almost no federal income tax — while sitting on a ticking tax bill in their IRA.

The problem: that IRA grows. At 6%, a $2M IRA becomes $3M in eight years. When RMDs begin at 73, the required distribution on $3M is roughly $113,200 in the first year (balance ÷ 26.5 from the IRS Uniform Lifetime Table¹). Add Social Security, and you're deep into the 22–24% federal bracket for the rest of your life — with no more opportunities to reduce it.

Roth conversions in the 60–73 window are the mechanism for changing that trajectory. You pay tax now at a controlled rate, move assets to tax-free growth, and shrink the IRA that will drive future RMDs.

The Bracket Math (2026)

For 2026, the federal income tax brackets for married filing jointly are:²

The 2026 standard deduction is $32,200 for MFJ ($16,100 single) — plus an additional $1,650 per spouse aged 65 or older.² So a married couple both aged 67 with no other deductions can receive $35,500 in income before any taxable income appears.

Bracket-filling conversions target the gap between your current taxable income and the top of a bracket you're comfortable paying. The 22% bracket top for MFJ is $211,400 in taxable income — equivalent to roughly $246,900 in gross income after the $35,500 standard deduction for a couple both over 65.

If your only other income is a $40,000 pension, you have room for approximately $171,000 in Roth conversions before crossing into the 24% bracket.

The IRMAA Layer: Two Years of Lead Time

Medicare's Income-Related Monthly Adjustment Amount (IRMAA) adds surcharges to your Part B and Part D premiums when your income exceeds certain thresholds. The critical detail: your 2026 Medicare premiums are based on your 2024 tax return — a two-year lookback.

In 2026, the first IRMAA tier begins at $218,000 MAGI for married couples (joint filers) and $109,000 for single filers.³ Crossing this line adds $974/year per person in Part B surcharges — $1,948 for a couple, both on Medicare.

This means a large Roth conversion you do in 2026 will affect your 2028 Medicare premiums, not 2026 premiums. You have time to plan, but you must plan ahead. Strategies:

• Stay under the cliff. If you're converting in 2026 with MAGI near $215,000, a modest planning error tips you into the first IRMAA tier — $1,948 extra per year for two years before you can prove income dropped. In the example above, $195K MAGI leaves $23K of headroom before Tier 1.
• Model forward. As Social Security begins and RMDs phase in, your income will rise. Conversions done today reduce future RMDs and therefore future IRMAA exposure — a long-term win even if they temporarily increase your near-term surcharge tier.
• Know when to accept the surcharge. If converting $50,000 more means crossing into IRMAA Tier 1 for two years, you pay roughly $4,000 extra in Medicare premiums. But if that conversion saves $12,000+ in future RMD taxes, it's still positive expected value.

Social Security Timing Interaction

When you claim Social Security changes the size and duration of your conversion window. Claiming at 62 adds income immediately, eating into available bracket space. Claiming at 70 maximizes your low-income years.

A couple where both spouses delay SS to 70 might have 5–8 years of near-zero income — the optimal Roth conversion window. Claiming early at 62 may compress that window to 1–2 years, or eliminate it if the combined SS payments push you out of favorable brackets immediately.

This is one of the most financially consequential timing decisions in retirement. A financial planner who models both Social Security optimization and Roth conversion sequencing can show you the difference in projected lifetime tax.

The OBBBA Senior Deduction (2025–2028)

The One Big Beautiful Bill Act (July 2025) created a temporary additional deduction of $6,000 per person for taxpayers aged 65 or older, available for tax years 2025 through 2028.⁴ For a married couple where both spouses qualify, this adds $12,000 to their effective deductions — meaning even more room to convert before taxable income rises.

Important catch: this senior deduction phases out above $150,000 MAGI for joint filers. If your conversions push MAGI above that threshold, you begin losing the $12,000 deduction. This creates a marginal rate "hump" in the $150K–$200K range worth modeling before choosing your annual conversion amount. In some cases, converting slightly less to preserve the senior deduction saves more tax than filling the 22% bracket.

When NOT to Convert

Roth conversions are not always the right move. Situations where you should be cautious:

• High state income taxes. States like California (top rate 13.3%) and New York (10.9%) tax conversions as ordinary income. If your state taxes are high and you're converting into the 22% federal bracket, your combined marginal rate on the conversion can exceed 30%. Conversions still make sense in many cases, but the breakeven timeline extends.
• You plan to use QCDs heavily. Qualified Charitable Distributions let you satisfy RMDs tax-free from your IRA from age 70½ (up to $111,000 in 2026¹). If you'll donate $50–100K/year to charity anyway, keeping assets in the IRA to fund QCDs may be more tax-efficient than converting them to Roth. The QCD offsets the RMD without triggering income — effectively a better deal than converting for money you'll give away.
• Short life expectancy or poor health. The breakeven for conversion taxes paid upfront vs. RMD taxes deferred is typically 8–12 years. If health conditions create uncertainty about longevity, holding off and using QCDs or estate deductions may be more conservative.
• Your heirs are in low tax brackets. If you expect to leave the IRA to children in the 12% bracket who will draw it down over 10 years under the inherited IRA rules, the tax efficiency of conversion vs. inherited IRA distributions becomes closer. The math still often favors conversion, but the margin is smaller.

Estate Planning Angle

Roth IRAs have no required minimum distributions for the original owner.¹ Assets can compound tax-free indefinitely. Beneficiaries who inherit a Roth IRA must drain it within 10 years (for non-spouse beneficiaries under the SECURE Act), but those distributions are income-tax-free. A $500,000 traditional IRA inherited by your adult child generates $50,000/year of taxable income as they take distributions; the same amount in Roth generates none.

For estates where the primary motivation is legacy — not personal income reduction — converting more aggressively and paying the tax yourself is a direct wealth transfer to heirs. You absorb the tax liability at your rate; they receive the growth tax-free.

What an Advisor Actually Models

Bracket-filling math is straightforward, but the full optimization involves simultaneous variables: Social Security timing, IRMAA cliff management, state tax rates, QCD planning, beneficiary income projections, the OBBBA senior deduction phaseout, and the 5-year Roth conversion clock. The answer changes materially when one variable shifts.

Most retirees who manage this well have one thing in common: they worked with a fee-only advisor who built a multi-year distribution model before taking action, not after. The decisions made between 60 and 73 are largely irreversible — you can't un-take a distribution or retroactively convert a prior year's RMD.

1. IRS Publication 590-B — Distributions from Individual Retirement Arrangements. Covers Roth IRA distribution rules, QCD rules, and the Uniform Lifetime Table for RMD calculations.
2. Tax Foundation — 2026 Tax Brackets and Federal Income Tax Rates. 2026 MFJ brackets and standard deduction amounts reflecting OBBBA inflation adjustments.
3. CMS / Kiplinger — Medicare Premiums 2026: IRMAA Brackets and Surcharges. 2026 Part B base premium $202.90/month; Tier 1 begins at $218,000 MAGI (MFJ) based on 2024 tax return.
4. IRS — IRS 2026 tax inflation adjustments including OBBBA amendments. Includes the $6,000/person senior deduction (ages 65+) for tax years 2025–2028, phasing out above $75,000 MAGI single / $150,000 MFJ.

Tax brackets, standard deduction, and IRMAA thresholds verified against IRS and CMS 2026 published values, April 2026. All figures are subject to annual adjustment; confirm current-year values at irs.gov and medicare.gov before planning.