For a full breakdown of IRA and Roth IRA rules, contribution limits, and conversion strategies, see the IRA and Roth IRA hub.
-nan Before you do a Roth conversion, calculate the tax cost and make sure you’re converting at a lower rate than you’d pay in retirement. A well-timed conversion can save tens of thousands in taxes over your lifetime — but doing it in the wrong year wastes money.
7 Things to Know Before Converting
| # | Key Point | Why It Matters |
|---|---|---|
| 1 | You’ll owe income tax on the converted amount | The conversion amount is taxed as ordinary income |
| 2 | There’s no income limit on conversions | Anyone can convert, regardless of income |
| 3 | There’s no dollar limit per year | But converting too much pushes you into a higher bracket |
| 4 | You should pay taxes from outside the account | Using conversion funds to pay taxes reduces the benefit |
| 5 | The 5-year rule applies to conversions | Each conversion has its own 5-year clock for penalty-free withdrawal |
| 6 | Conversions are irreversible | As of 2018, you cannot “recharacterize” (undo) a Roth conversion |
| 7 | The optimal time is when your income is low | Gap years, early retirement, before RMDs and Social Security start |
Tax Cost by Bracket
| Amount Converted | 12% Bracket | 22% Bracket | 24% Bracket | 32% Bracket |
|---|---|---|---|---|
| $10,000 | $1,200 | $2,200 | $2,400 | $3,200 |
| $25,000 | $3,000 | $5,500 | $6,000 | $8,000 |
| $50,000 | $6,000 | $11,000 | $12,000 | $16,000 |
| $100,000 | $12,000 | $22,000 | $24,000 | $32,000 |
Plus state income taxes. Convert only enough to fill your current bracket — don’t overflow into the next.
Bracket-Filling Strategy Example
| Scenario | Single Filer, 2026 |
|---|---|
| Taxable income (without conversion) | $50,000 |
| Top of 22% bracket | $103,350 |
| Room to convert in 22% bracket | $53,350 |
| Tax cost of converting $53,350 | $11,737 (federal) |
| Benefit: $53,350 grows tax-free forever | No taxes on withdrawals, no RMDs |
Converting $53,350 fills the 22% bracket without spilling into 24%. This is the optimal amount.
Best Times to Convert
| Situation | Why It’s Optimal |
|---|---|
| Between jobs (low-income year) | Lower bracket = lower conversion tax |
| Early retirement (before Social Security + RMDs) | Income is at its lowest |
| Year of large deductions (medical, charitable) | Deductions offset conversion income |
| Market downturn | Convert when account value is temporarily low — same shares, less tax |
| Before expected tax rate increases | Lock in today’s lower rates |
| Starting a business with early losses | Business losses offset conversion income |
When NOT to Convert
| Situation | Why It’s a Bad Idea |
|---|---|
| Already in a high tax bracket | Paying 32-37% on conversions rarely makes sense |
| You’d need to use conversion funds to pay the tax | Reduces the Roth benefit significantly |
| You’ll need the money within 5 years | 5-year rule may trigger penalties on earnings |
| You’re over 72 and RMDs push you into high brackets | RMD income + conversion income = very high tax bill |
| You expect to be in a lower bracket in retirement | Pay less tax later by leaving it traditional |
| Conversion pushes you above ACA subsidy cliff | Could lose $5,000-$15,000 in health insurance subsidies |
Roth Conversion vs. Traditional Comparison
| Factor | Keep Traditional | Convert to Roth |
|---|---|---|
| Tax paid now | $0 | Tax on converted amount |
| Tax in retirement | Ordinary income rates on withdrawals | $0 — tax-free |
| Required minimum distributions (73+) | Yes — forced taxable withdrawals | No RMDs for Roth IRAs |
| Estate benefit | Heirs pay income tax on withdrawals | Heirs get tax-free withdrawals |
| Social Security taxation | Withdrawals increase combined income | Roth withdrawals don’t count |
| Medicare premium surcharges (IRMAA) | Withdrawals can trigger surcharges | Roth withdrawals don’t count |
Multi-Year Conversion Strategy
| Year | Taxable Income | Convert | Tax Bracket | Tax Cost |
|---|---|---|---|---|
| Year 1 (retire at 60) | $20,000 | $75,000 | 12-22% | ~$11,500 |
| Year 2 | $20,000 | $75,000 | 12-22% | ~$11,500 |
| Year 3 | $20,000 | $75,000 | 12-22% | ~$11,500 |
| Year 4 | $20,000 | $75,000 | 12-22% | ~$11,500 |
| Year 5 (start SS at 65) | $45,000 | $50,000 | 22% | ~$11,000 |
| Total converted | — | $350,000 | — | ~$57,000 |
Without conversions, RMDs on $350K at 73 could be taxed at 24-32% — costing $84,000-$112,000. Conversion saved $27,000-$55,000.
The Bottom Line
A Roth conversion is one of the most powerful tax planning tools in retirement — but timing is everything. The ideal strategy is to convert during low-income years (early retirement, between jobs, market downturns) using a bracket-filling approach. Pay the taxes from a separate account, spread conversions over multiple years, and avoid converting so much that you jump into a higher bracket or lose ACA subsidies. Done right, a multi-year Roth conversion ladder can save you tens of thousands in lifetime taxes.
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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