Pension Rollover to Roth IRA: Tax Math and When It Makes Sense (2026)

When you take a pension lump sum and roll it into a traditional IRA, you've only deferred taxation — you haven't eliminated it. Every dollar you eventually take out, including forced required minimum distributions, is taxable as ordinary income. A Roth conversion flips that math: pay tax now at today's known rate, and everything in the Roth IRA grows tax-free, stays tax-free when you withdraw it, and is never subject to required minimum distributions. For a retiree in their early 60s with a $700,000–$1.5 million pension rollover and a decade before RMDs start, converting strategically over several years can eliminate hundreds of thousands of dollars of lifetime tax liability. But it requires careful bracket management — especially in 2026, where the One Big Beautiful Bill Act added a new optimization wrinkle.

The mechanics: how pension-to-Roth conversion works

Converting a pension rollover to a Roth IRA is a two-step process:

1. Step 1 — Direct rollover to traditional IRA (tax-deferred). When you elect the pension lump sum, you instruct your employer to wire the funds directly to your IRA custodian (Fidelity, Schwab, Vanguard, etc.) rather than paying them to you. No tax is withheld; the entire amount lands in your traditional IRA. This step is always tax-free.¹
2. Step 2 — Roth conversion (taxable). You then instruct your IRA custodian to convert any portion of your traditional IRA to a Roth IRA. The converted amount is added to your gross income in the calendar year of the conversion and taxed at ordinary income rates. You file Form 8606 with your tax return to report the conversion.²

Note: if your traditional pension plan is a governmental plan (e.g., a 403(b) or 457(b) with Roth in-plan conversion features), you may be able to convert directly within the plan. But most corporate and union pension lump sums roll first to a traditional IRA, and conversion happens from there. The result is identical.

Why convert? Five reasons the math favors Roth after a pension rollover

1. No required minimum distributions from Roth IRA

The single most powerful argument for converting pension rollover dollars to Roth is that Roth IRAs have no required minimum distributions during the owner's lifetime.³ A traditional IRA from a pension rollover forces mandatory taxable distributions starting at age 73 or 75 — whether you need the money or not. A $900,000 pension rolled to a traditional IRA and growing at 5% annually becomes approximately $1.5 million when the first RMD hits at age 73. That first RMD is roughly $57,000 — fully taxable, potentially pushing you into a higher bracket and triggering Medicare IRMAA surcharges.

Every dollar you convert to Roth before RMDs start is permanently removed from that obligation. Roth IRA balances pass to heirs, who have 10 years to withdraw — and those withdrawals are also tax-free.

2. Tax-free growth for potentially decades

Roth IRA balances grow tax-free indefinitely. For a retiree converting at 63 who lives to 88, that's 25 years of tax-free compounding. If the Roth IRA doubles over that period, the entire doubling is tax-free — vs. the traditional IRA doubling creating proportionally larger taxable RMDs.

3. IRMAA management in your 70s and 80s

Medicare IRMAA surcharges are based on income two years prior. A growing traditional IRA produces escalating RMDs that perpetually push MAGI higher, triggering IRMAA surcharges that compound over time. Reducing the traditional IRA balance through Roth conversions in the years before RMDs start is one of the few ways to permanently reduce future IRMAA exposure. The 2026 IRMAA Tier 1 threshold is $109,000 for single filers and $218,000 for married couples — see the Pension Income & Medicare IRMAA Guide for the full bracket table.

4. Rates are known today; future rates are not

The One Big Beautiful Bill Act (OBBBA, July 2025) made the TCJA income tax rates permanent — the 22% and 24% brackets are no longer at risk of reverting to 25% and 28% as they were before July 2025. This removes the urgency argument ("convert before rates go up"). But it doesn't remove the planning argument: a retiree in the 22% bracket today, whose future RMDs would push them into the 32% bracket, still benefits from paying 22% now instead of 32% later.

5. Estate planning efficiency

Roth IRA assets inherited by a non-spouse beneficiary are still subject to the 10-year distribution rule (SECURE Act). But those distributions are income-tax-free. A traditional IRA inherited by adult children in their prime earning years forces them to take taxable distributions during their highest-income years. Roth conversion now — paying tax at your 22% rate — shifts the tax-free benefit to heirs who might otherwise pay 32% or 35% on inherited traditional IRA withdrawals.

The optimal conversion window: ages 60–73

For most pension retirees, the ideal Roth conversion window is the period after they retire but before two income streams start: Social Security and RMDs. This window — typically ages 60–73 — often produces the lowest taxable income of a retiree's life, creating an opportunity to convert at the lowest effective tax rates they'll ever see.

2026 tax brackets: what conversion actually costs

Roth conversions are taxed at ordinary income rates. The 2026 brackets (per IRS Rev. Proc. 2025-32⁴):

Single filers

Married filing jointly

Standard deduction offsets

Before applying brackets, subtract your standard deduction. For 2026:⁴

• Single: $16,100 base + $1,650 additional if age 65+
• MFJ: $32,200 base + $1,650 per spouse age 65+

For a couple both age 65, the 2026 standard deduction is $35,500 before considering the OBBBA senior bonus (see below). This is the floor of deductions before you reach taxable income.

The OBBBA senior bonus deduction trap: a 2026 planning wrinkle

The One Big Beautiful Bill Act added a temporary $6,000 deduction per person age 65 or older for tax years 2025–2028. For a married couple both age 65+, that's $12,000 of additional deductions — reducing taxable income meaningfully at low income levels. But it phases out for MAGI above $75,000 (single) or $150,000 (married filing jointly).⁵

Here's the trap: a Roth conversion directly increases MAGI. A large single-year conversion can spike your MAGI above the OBBBA phaseout threshold, eliminating the $6,000 (or $12,000 for couples) deduction — costing you $1,320–$2,640 in additional federal tax on top of the conversion cost.

Illustrating the OBBBA phaseout cost

The $12,000 OBBBA loss at the 22% bracket rate adds $2,640 to the tax cost of the larger conversion — equivalent to a slightly higher effective tax rate on the converted amount. Not a reason to avoid converting; a reason to model whether staying under $150,000 MAGI produces a better after-tax outcome for your specific situation.

Worked example: converting an $850,000 pension rollover over 10 years

Consider a married couple, both age 65, who rolled an $850,000 corporate pension lump sum into a traditional IRA. Both spouses deferred Social Security to age 70 to maximize survivor benefit. They have no other income in years 65–70. Their RMD start age is 75 (born 1960 or later — 10-year conversion window).

Strategy: convert $100,000/year for 10 years (ages 65–74), targeting the 22% bracket and staying under the $150,000 MFJ OBBBA phaseout threshold.

Annual conversion math (ages 65–69, before SS starts)

At 5.8% effective federal tax rate, this couple is paying $5,804 to permanently convert $100,000 from taxable-forever-growing to never-taxed-again. Over 10 years: $1,000,000 converted, approximately $58,000 in total federal tax — locking in a lifetime of tax-free growth.

What the two paths look like at age 85

Assumptions: 5% annual return; $850K initial rollover; Social Security starts at 70. Illustration only — actual outcomes depend on investment returns, additional income, and tax law changes. The core point: converting over the 10-year window dramatically shrinks the taxable RMD burden at age 85 while building a large tax-free Roth balance.

IRMAA awareness: the $218,000 MFJ threshold

Roth conversion income counts toward Medicare IRMAA MAGI with a two-year lookback. A $200,000 Roth conversion in 2026 creates $200,000 of MAGI in 2026 → 2028 Medicare premiums are based on that income. For a couple whose combined MAGI would otherwise be well under $218,000, a single large conversion year can trigger IRMAA surcharges for two Medicare years.

For the couple in the example above, converting $100,000/year with no other income keeps MAGI at $100,000 — comfortably under the $218,000 MFJ IRMAA Tier 1 threshold (no surcharge). A couple who instead attempted to convert $300,000 in a single year would push MAGI to $300,000, triggering IRMAA surcharges for two years at significant additional cost.

See the Pension Income & Medicare IRMAA Guide for the full 2026 IRMAA bracket table including the Tier 1 through Tier 5 surcharges.

Social Security coordination: the provisional income interaction

Once Social Security starts, Roth conversion income counts in the provisional income formula — the calculation that determines how much of your SS benefit is taxable:⁶

Provisional income = AGI (excluding SS) + tax-exempt interest + 50% of SS benefit

For a retiree with $36,000 in SS income and a $80,000 Roth conversion: provisional income = $80,000 + $18,000 = $98,000 → well above the $44,000 MFJ threshold → 85% of SS is taxable ($30,600 additional taxable income). This is manageable and expected, but it means conversions after SS starts are more tax-expensive than conversions before SS starts. One more reason to front-load Roth conversions in the early retirement years, before Social Security begins.

State tax on Roth conversions: the pension-exempt state trap

Several states exempt pension income from state income tax. But a pension lump sum rolled to a traditional IRA — and then converted to Roth — is no longer treated as "pension income" by most state revenue departments. It's IRA income, which may be fully taxable at the state level even if the original pension would have been exempt.

States where this gap is most consequential:

• Illinois: fully exempts pension income from all sources — but IRA distributions and Roth conversions are treated as ordinary income and fully taxable at the 4.95% flat rate.
• Pennsylvania: exempts employer pension income — but IRA distributions are taxable until age 59½; over 59½ they are generally exempt. A Roth conversion from a rolled-over pension IRA may still qualify for PA's over-59½ exemption in most cases, but confirm with a Pennsylvania CPA.
• Mississippi and Iowa: broadly exempt retirement income, and Roth conversions from IRAs are typically also exempt. Verify current rules with a state-specific tax professional.

Before executing a large Roth conversion, verify how your state treats IRA-to-Roth conversions specifically — not just how it treats "pension income."

Who benefits most from pension-to-Roth conversion

Strong candidates for conversion

• Large rollover relative to income needs. If the IRA balance will generate RMDs substantially larger than your spending needs, forced taxable distributions will compound in your later years. Conversion removes that pressure.
• Long time horizon. More years of tax-free Roth growth amplifies the benefit. Converting at 62 produces better outcomes than converting at 72, all else equal.
• Low current income in early retirement. If your only income in ages 62–67 is modest investment returns and you haven't claimed SS, your taxable income may be surprisingly low — making the cost of conversion lower than it will ever be again.
• Heirs in high brackets. Children in their 40s–50s inheriting a traditional IRA face 10-year mandatory distributions during their peak earning years. Roth conversion shifts the tax burden from their 32% bracket to your 22% bracket.
• IRMAA management priority. If you're already concerned about IRMAA in your 70s from RMD-level income, converting now to reduce the future traditional IRA balance is a structural solution, not a workaround.

Poor candidates for conversion

• Already in the 32% bracket or higher. If your pension annuity income, RMDs, and other sources put you in the 32%+ bracket today, converting additional income at 32% makes sense only if your future rate would be higher still — a more speculative bet.
• Short life expectancy. The tax-free growth benefit compounds over time. Shorter horizons mean less compounding, potentially not enough to justify the upfront tax cost.
• Needed liquidity. You pay income tax on converted amounts in the year of conversion. If you need that money to live on, using IRA funds to pay conversion taxes depletes the account you're trying to build. Conversion works best when you can pay the tax bill from other assets (taxable accounts, pension annuity income, etc.).
• No-income-tax state residents with pension-exempt rules. Florida, Texas, Nevada, Wyoming, South Dakota, Washington, Alaska, and Tennessee/New Hampshire have no state income tax. Illinois residents with large pensions face a state trap on conversions (see above). If you're in a zero-income-tax state and your current bracket is manageable, the case is clean. If you're in a pension-exempt state that taxes conversions, factor in the state tax cost.

The partial conversion strategy: fill brackets, not slam them

The most common mistake in Roth conversion planning is converting too much in a single year — pushing into a higher bracket, phasing out the OBBBA senior bonus, and triggering IRMAA. The better approach is to "fill" the most favorable bracket each year:

1. Calculate your estimated income from all non-conversion sources (SS, annuity payments, interest).
2. Determine how far you are from the top of the 22% bracket (or the IRMAA threshold, or the OBBBA phaseout — whichever comes first).
3. Convert exactly that amount — not more.
4. Repeat each year until RMDs start or the traditional IRA balance is where you want it.

This approach spreads the tax cost over multiple years, preserves OBBBA deductions while MAGI permits, avoids IRMAA surcharges, and keeps each year's tax bill within a predictable range. It requires annual recalibration — your income, bracket thresholds, and IRA balance change each year.

Sources

1. IRS — Rollovers of Retirement Plan and IRA Distributions. Official IRS guidance on direct rollover mechanics: employer plan to traditional IRA is tax-free when paid directly to custodian (no 20% withholding); 60-day indirect rollover rules; and the requirement that the taxpayer not take constructive receipt of funds for the rollover to be non-taxable. Values current as of May 2026.
2. IRS — Retirement Plans FAQs Regarding IRAs. Confirms: (a) there is no income limit on Roth IRA conversions from traditional IRAs (income limits apply only to direct Roth contributions); (b) Form 8606 must be filed in the year of conversion to report converted amounts; (c) converted amounts are included in gross income in the year of conversion at ordinary income rates. Authoritative IRS FAQ updated for 2026.
3. IRS — Retirement Topics: Required Minimum Distributions (RMDs). Confirms Roth IRA owners are not subject to RMDs during their lifetime (IRC §408A(c)(5)); SECURE 2.0 §107 RMD start ages of 73 (born 1951–1959) and 75 (born 1960 or later); and the rule that RMDs must be satisfied before converting any remaining balance to Roth in a given year.
4. IRS Rev. Proc. 2025-32 — 2026 Tax Inflation Adjustments. Official IRS Revenue Procedure establishing 2026 tax rate schedules, standard deduction amounts ($16,100 single; $32,200 MFJ), and additional standard deduction for taxpayers age 65+ ($1,650 per qualifying person). These values are used throughout this guide for bracket and deduction calculations.
5. IRS — One Big Beautiful Bill Provisions. IRS summary of OBBBA provisions including the senior bonus deduction: $6,000 per person age 65+ for tax years 2025–2028, phasing out for MAGI above $75,000 (single) / $150,000 (MFJ). The interaction with Roth conversion income (which increases MAGI and can phase out the deduction) is a key planning consideration for retirees doing partial conversions.
6. SSA.gov — Income Taxes and Your Social Security Benefits. SSA official explanation of provisional income formula and Social Security taxability thresholds: $25,000–$34,000 (single) triggers 50% SS taxability; over $34,000 triggers 85% taxability. MFJ thresholds: $32,000–$44,000 and over $44,000. Roth conversion income counts in full toward provisional income — a reason to front-load conversions before Social Security begins.

Tax brackets, standard deduction amounts, and OBBBA senior bonus deduction verified against IRS Rev. Proc. 2025-32 and IRS OBBBA provisions summary. IRMAA thresholds cross-referenced with the Pension Income & Medicare IRMAA Guide. Values current as of May 2026. Tax law changes frequently — verify with a CPA or fee-only financial advisor before implementing.

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