Roth IRA Conversion Calculator

How to Use This Tool

Follow these steps to get accurate Roth IRA conversion estimates:

• Enter your total traditional IRA balance you plan to convert.
• Select your current federal income tax bracket from the dropdown.
• Input your state income tax rate (use 0 if your state has no income tax).
• Enter your expected annual investment return (7% is a common long-term stock market average).
• Input the number of years until you plan to retire and start taking withdrawals.
• Select your expected federal tax bracket in retirement.
• Choose whether you will pay conversion taxes from the IRA balance or from external savings.
• Click Calculate to see your detailed results, or Reset to clear all inputs.

Formula and Logic

This calculator uses standard compound interest and tax rules for US retirement accounts:

• Conversion tax owed = (Traditional IRA balance × Current federal tax rate) + (Traditional IRA balance × State tax rate)
• Net Roth conversion amount = Traditional IRA balance - Conversion tax (if paying taxes from IRA) or full Traditional IRA balance (if paying taxes externally)
• Projected Roth balance = Net Roth conversion amount × (1 + Expected annual return) ^ Years until retirement
• Projected traditional IRA balance (if not converted) = Traditional IRA balance × (1 + Expected annual return) ^ Years until retirement
• Future traditional IRA tax bill = Projected traditional IRA balance × Expected retirement federal tax rate
• Net after-tax retirement savings (traditional) = Projected traditional IRA balance - Future traditional IRA tax bill

All growth calculations assume annual compounding with no additional contributions or withdrawals during the time horizon.

Practical Notes

• Roth IRA conversions are taxable as ordinary income in the year of conversion, which may push you into a higher tax bracket if you convert a large amount.
• You must wait 5 years from the conversion date to withdraw converted amounts tax-free, even if you are over 59.5.
• Paying conversion taxes from external funds preserves more of your IRA balance for tax-free growth, but requires liquid savings.
• State tax treatment of Roth conversions varies: some states do not tax conversions, while others follow federal rules.
• Required Minimum Distributions (RMDs) apply to traditional IRAs starting at age 73 (as of 2024), but Roth IRAs have no RMDs for the original owner.
• This calculator assumes a constant tax rate and investment return, which may not reflect real-world fluctuations.

Why This Tool Is Useful

• Quantifies the upfront tax cost of a Roth conversion against long-term tax-free growth benefits.
• Helps you avoid unexpected tax bills by modeling conversion tax owed before you file.
• Compares your net retirement savings under both conversion and no-conversion scenarios.
• Accounts for tax payment method, which significantly impacts your final Roth balance.
• Useful for financial planners and individuals to model "what-if" scenarios for retirement planning.

Frequently Asked Questions

Will a Roth IRA conversion increase my taxable income this year?

Yes, the amount you convert from a traditional IRA to a Roth IRA is added to your ordinary income for the tax year of the conversion. This may push you into a higher tax bracket if the conversion amount is large, so it is often beneficial to spread conversions over multiple years to stay in a lower bracket.

Can I undo a Roth IRA conversion if I change my mind?

You can recharacterize a Roth conversion back to a traditional IRA by the tax filing deadline (including extensions) for the year of the conversion. However, this option is only available if you meet IRS eligibility rules, and you must pay any taxes owed on the original conversion when recharacterizing.

Is a Roth IRA conversion worth it if I expect my tax bracket to be lower in retirement?

Generally, a conversion is most beneficial if you expect your retirement tax bracket to be higher than your current bracket. If your retirement bracket is lower, you may pay more in upfront taxes than you save in retirement, making the conversion less advantageous. This tool lets you model both scenarios to see the net impact.

Additional Guidance

• Consult a tax professional before making large Roth conversions, as they can impact your eligibility for other tax benefits (such as the Child Tax Credit or deductibility of IRA contributions).
• Consider spreading large conversions over multiple years to avoid jumping into a higher tax bracket.
• If you are close to retirement, a conversion may still be beneficial if you expect to leave Roth assets to heirs, as inherited Roth IRAs have tax-free growth for beneficiaries.
• Remember that this calculator is for estimation purposes only and does not account for changes in tax law, investment fees, or inflation.