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 regular income, converting additional amounts:
| Conversion Amount | Tax Bracket Used | Federal Tax on Conversion | Effective Rate |
|---|---|---|---|
| $0 | 22% (existing income) | $0 | — |
| $10,000 | 22% | $2,200 | 22% |
| $25,000 | 22% | $5,500 | 22% |
| $50,000 | 22% ($48K) + 24% ($2K) | $11,040 | 22.1% |
| $100,000 | 22-32% | $24,340 | 24.3% |
Strategy: Convert just enough to fill your current bracket. Converting $48,000 stays in the 22% bracket. Converting $50,000+ pushes into 24%.
2026 Tax Bracket Opportunity
The 2017 Tax Cuts and Jobs Act (TCJA) provisions are set to expire after 2025. If Congress doesn’t extend them:
| Bracket (2025) | Bracket (2026 if TCJA expires) | Change |
|---|---|---|
| 10% | 10% | Same |
| 12% | 15% | +3% |
| 22% | 25% | +3% |
| 24% | 28% | +4% |
| 32% | 33% | +1% |
| 35% | 35% | Same |
| 37% | 39.6% | +2.6% |
If rates increase, Roth conversions done at 2025 rates will look very smart in hindsight.
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 (~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 |
Large RMDs can push you into higher brackets and trigger Medicare IRMAA surcharges ($2,000+/year). 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:
| Year | Conversion Amount | Tax Bracket | Federal Tax |
|---|---|---|---|
| Age 55 | $50,000 | 12% | $4,200 |
| Age 56 | $50,000 | 12% | $4,200 |
| Age 57 | $50,000 | 12% | $4,200 |
| … | … | … | … |
| Ages 55-67 | $600,000 total | 12% | $50,400 total |
If that $600,000 stayed in traditional IRA and was withdrawn at 22-24% in retirement: $132,000-$144,000 in taxes. Conversion savings: ~$82,000-$94,000.
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 opportunities: the years between retirement and Social Security, and the potential of higher tax rates after 2025 TCJA expiration.
Related: Should I Contribute to Roth or Traditional? | Roth IRA Contribution Limits