A Roth conversion is worth it when your current tax rate is lower than your expected retirement tax rate. You pay taxes now at a known rate and get tax-free growth and withdrawals for life — plus no required minimum distributions.
Quick Decision Framework
| Your Situation | Roth Conversion? | Why |
|---|---|---|
| Low-income year (between jobs, early retirement) | ✅ Yes | Fill up low tax brackets with conversions |
| Currently in 12% or 22% bracket, expect higher in retirement | ✅ Yes | Lock in low rate now |
| Large traditional IRA/401(k), worried about RMDs | ✅ Yes | Reduces future required distributions |
| Currently in 32%+ bracket | ❌ Probably not | High tax cost now |
| Retiring soon, income will drop permanently | ❌ No | You’ll be in a lower bracket anyway |
| Need the money within 5 years | ❌ No | 5-year rule penalizes early withdrawal |
| Have to pay taxes from the IRA itself | ❌ No | Defeats the purpose |
| Expect tax rates to increase in the future | ✅ Yes | Pay known rate now |
How a Roth Conversion Works
| Step | What Happens |
|---|---|
| 1 | Move money from traditional IRA/401(k) to Roth IRA |
| 2 | Converted amount is added to your taxable income for the year |
| 3 | You pay income tax on the converted amount (no 10% penalty regardless of age) |
| 4 | Money grows tax-free in Roth IRA |
| 5 | Withdrawals are tax-free after age 59½ and 5-year rule is met |
| 6 | No required minimum distributions — ever |
Tax Cost by Conversion Amount
Single filer, $50,000 in existing taxable income (2026 brackets: 12% bracket runs $12,400–$50,400), converting additional amounts:
| Conversion Amount | Tax Bracket(s) Used | Federal Tax on Conversion | Effective Rate |
|---|---|---|---|
| $0 | 12% (existing income) | $0 | — |
| $10,000 | 12% → 22% | $2,160 | 21.6% |
| $25,000 | 12% → 22% | $5,460 | 21.8% |
| $50,000 | 12% → 22% | $10,960 | 21.9% |
| $100,000 | 12% → 22% → 24% | $22,846 | 22.8% |
Because the existing $50,000 in taxable income sits just below the top of the 2026 12% bracket ($50,400), even a small conversion pushes most of the converted amount into the 22% bracket.
Strategy: Convert just enough to fill your current bracket. In this example, converting up to about $55,700 keeps the household within the 22% bracket (total taxable income up to $105,700) without spilling into 24%.
Why 2026 Tax Rates Matter
The Tax Cuts and Jobs Act (TCJA) individual rate brackets (10%–37%) were originally scheduled to expire after 2025 and revert to higher pre-TCJA rates (up to 39.6%). The 2025 One Big Beautiful Bill Act (OBBBA) made the TCJA’s lower individual rate structure permanent, so that scheduled increase did not happen for 2026 — rates and bracket structure remain 10%, 12%, 22%, 24%, 32%, 35%, and 37%, with thresholds adjusted annually for inflation. This removes the “convert before rates jump in 2026” urgency that applied under prior law, though future legislation could still change rates — Roth conversions remain a hedge against that possibility.
The RMD Problem
At age 73 (75 starting 2033), you must take required minimum distributions from traditional IRAs and 401(k)s:
| Traditional IRA Balance at 73 | First-Year RMD (Uniform Lifetime Table, ~3.8%) | Tax at 22% | Tax at 24% |
|---|---|---|---|
| $500,000 | $18,870 | $4,151 | $4,529 |
| $1,000,000 | $37,740 | $8,303 | $9,058 |
| $2,000,000 | $75,470 | $16,603 | $18,113 |
| $3,000,000 | $113,210 | $24,906 | $27,170 |
The RMD divisor for age 73 comes from the IRS Uniform Lifetime Table (Pub. 590-B), a fixed actuarial table that doesn’t change annually the way contribution limits do — confirm the current published divisor before relying on this figure. Large RMDs can push you into higher brackets and trigger Medicare IRMAA surcharges. Roth conversions before 73 reduce this.
Best Timing for Roth Conversions
| Life Stage | Tax Opportunity | Conversion Strategy |
|---|---|---|
| Early career (20s-30s) | Low income, low bracket | Contribute directly to Roth; conversions less needed |
| Peak earning years (40s-50s) | High bracket | Usually not ideal — high tax cost |
| Early retirement (55-65) | Gap between career income and Social Security/RMDs | Prime conversion window — fill low brackets |
| Before Social Security (62-70) | Income may be very low | Excellent — convert at lowest rates |
| After 73 (RMDs begin) | Must take RMDs + conversion amount increases income | Still possible but more complex to manage brackets |
Example: The Early Retirement Conversion Ladder
Retired at 55, living on savings, no earned income, converting $50,000/year:
| Year | Conversion Amount | Taxable After Standard Deduction ($16,100 single, 2026) | Federal Tax |
|---|---|---|---|
| Age 55 | $50,000 | $33,900 | $3,820 |
| Age 56 | $50,000 | $33,900 | $3,820 |
| Age 57 | $50,000 | $33,900 | $3,820 |
| … | … | … | … |
| Ages 55-66 (12 years) | $600,000 total | — | ~$45,840 total |
Assumes the standard deduction offsets the conversion each year and no other income; the marginal bracket used stays within 12% throughout.
If that $600,000 stayed in traditional IRA and was withdrawn at 22-24% in retirement: $132,000-$144,000 in taxes. Conversion savings: roughly $86,000-$98,000.
The 5-Year Rule
Each conversion has its own 5-year clock:
| Rule | Details |
|---|---|
| What it applies to | Converted amounts (not earnings) withdrawn before age 59½ |
| Penalty | 10% on converted amount if withdrawn within 5 years AND before 59½ |
| When it doesn’t matter | If you’re already 59½+, no penalty regardless of 5-year rule |
| Strategy | Convert early; let the 5-year clock run |
The Bottom Line
Do a Roth conversion if you’re in a lower tax bracket now than you expect in the future — especially during early retirement, career gaps, or before RMDs kick in at 73. Convert just enough to fill your current bracket each year. Pay the taxes from a separate account, not the IRA itself.
The biggest opportunity remains the years between retirement and Social Security/RMDs, when income is naturally low. Tax brackets and the standard deduction are adjusted annually for inflation — confirm the current-year figures at irs.gov before finalizing a conversion amount.
Sources
For more on Roth IRA strategy and rules, see the Roth IRA hub.
For more on Roth IRA strategy and rules, see the Roth IRA hub.
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