Free Roth conversion tax calculator. Estimate the tax cost of converting a Traditional IRA to Roth IRA, find the optimal conversion amount, and project break-even years.
The Roth Conversion Tax Calculator estimates the incremental tax cost of converting a Traditional IRA or 401(k) to a Roth IRA. Because conversion amounts are added to your ordinary income for the year, the tax impact depends on your current marginal bracket and how much you convert.
A Roth conversion can be a powerful long-term strategy: you pay taxes now at today's rates, and all future growth is tax-free. This is especially attractive if you expect higher tax rates in retirement or want to eliminate Required Minimum Distributions (RMDs).
Enter your current income, filing status, and the amount you want to convert to see the bracket impact, conversion tax cost, and a break-even projection comparing the value of converting now versus keeping funds in a Traditional IRA. Converting at the right time and in the right amount can save tens of thousands of dollars in lifetime taxes, but converting too much in a single year can push you into higher brackets and trigger Medicare surcharges. Strategic partial conversions spread over multiple years often produce the best outcome.
Converting too much in a single year can push you into higher brackets, while converting too little may miss the window of opportunity. This calculator shows exactly how much tax each conversion layer costs and identifies the optimal amount to convert within your current bracket. Year-by-year optimization of conversion amounts can save tens of thousands in lifetime taxes.
Tax Before Conversion = Federal tax on current taxable income Tax After Conversion = Federal tax on (current taxable income + conversion amount) Conversion Tax Cost = Tax After − Tax Before Effective Conversion Rate = Conversion Tax Cost / Conversion Amount Break-Even Year: Future Roth Value × (1 − 0) = Traditional Value × (1 − future rate)
Result: Conversion tax: $8,907 | Break-even: ~8 years
With $85K income (single), the first $18,350 of conversion fills the 22% bracket, and the remaining $31,650 hits the 24% bracket. Total incremental tax cost is $8,907 (effective conversion rate: 17.8%). Assuming 7% returns over 20 years, the Roth value exceeds the after-tax Traditional value by year 8.
The most efficient approach is to convert just enough each year to fill your current bracket without spilling into the next one. For instance, if your taxable income is $85,000 and the 22% bracket ends at $103,350 (single), you could convert $18,350 at a 22% rate rather than pushing into the 24% bracket. Repeating this annually can convert a large Traditional balance over time at the lowest possible rates.
Large conversions can temporarily increase your Modified Adjusted Gross Income (MAGI), which affects: Medicare Part B and D premiums via IRMAA surcharges (based on income from 2 years prior), taxation of Social Security benefits, eligibility for certain deductions and credits, and Affordable Care Act premium subsidies. Always model the full income picture, not just the IRA conversion tax.
The years between retirement and age 72 (when RMDs begin) are often the optimal window for conversions. Income is typically lower, and filling the lower brackets each year can substantially reduce the RMD tax burden later.
A Roth conversion moves funds from a Traditional IRA (or other pre-tax retirement account) to a Roth IRA. The converted amount is added to your ordinary income for the year and taxed at your marginal rate. Once in the Roth, all future growth and qualified withdrawals are tax-free.
No. There is no annual limit on Roth conversion amounts. You can convert any portion of your Traditional IRA. However, converting large amounts pushes you into higher tax brackets, so strategic partial conversions over multiple years may be more tax-efficient.
Conversions tend to make sense when your current tax rate is lower than your expected future rate, when you have a long time horizon for tax-free growth to compound, when you want to eliminate RMDs, or when you're in a temporarily low-income year. The more of these factors that apply to your situation, the stronger the case for converting.
No. Since 2018 (Tax Cuts and Jobs Act), Roth conversion recharacterizations are no longer allowed. Once you convert, the tax liability is locked in. This makes it important to carefully plan conversion amounts before executing.
Each Roth conversion has its own 5-year clock. If you withdraw converted amounts within 5 years and are under 59½, a 10% early withdrawal penalty may apply (on the converted amount). Earnings withdrawn before age 59½ and before the 5-year period may also face penalties and taxes.
The break-even point is when the after-tax value of the Roth IRA (tax-free growth) equals the after-tax value of the Traditional IRA (growth minus future taxes). Beyond the break-even year, the Roth provides a net benefit. The longer your time horizon, the more valuable the conversion.