💰 Roth IRA Conversion Calculator
Estimate taxes and long-term savings from converting traditional IRA funds to Roth
Conversion Results
How to Use This Tool
Enter your current traditional IRA balance that you plan to convert to a Roth IRA. Select your current federal income tax bracket from the dropdown, and enter your state’s income tax rate (use 0 if your state does not collect income tax).
Input your expected annual investment return, the number of years until you plan to retire, and your expected federal tax bracket during retirement. Choose whether you will pay conversion taxes from funds outside the IRA or from the IRA balance itself.
Click the Calculate Conversion button to see a detailed breakdown of taxes owed, net converted amounts, and long-term savings comparisons. Use the Reset button to clear all inputs and start over.
Formula and Logic
The calculator uses standard time value of money and tax rules for IRA conversions:
- Conversion tax owed = Traditional IRA balance × (Federal tax bracket + State tax rate)
- If paying taxes from outside the IRA: Net converted balance = Full traditional IRA balance
- If paying taxes from inside the IRA: Net converted balance = Traditional IRA balance - Conversion tax owed
- Future value of investments = Present value × (1 + Annual return)^Years to retirement
- Roth IRA future value = Net converted balance × (1 + Annual return)^Years to retirement (tax-free withdrawals)
- Traditional IRA future after-tax value = (Traditional IRA balance × (1 + Annual return)^Years to retirement) × (1 - Retirement tax bracket)
- Net savings = Roth future value - Traditional after-tax future value
Practical Notes
Keep these finance-specific factors in mind when using this calculator:
- Conversion taxes are due in the year of the conversion, so ensure you have liquid funds if paying from outside the IRA to avoid underpayment penalties.
- Roth IRA withdrawals are tax-free in retirement if the account is held for at least 5 years and you are over 59.5 years old.
- Traditional IRA required minimum distributions (RMDs) start at age 73, while Roth IRAs have no RMDs during the owner’s lifetime.
- State tax treatment of Roth conversions varies: some states do not tax Social Security or retirement income, which may affect your effective rate.
- Expected returns are not guaranteed: historical S&P 500 returns average ~10% annually, but adjust this value based on your risk tolerance.
Why This Tool Is Useful
This calculator eliminates guesswork when deciding whether a Roth IRA conversion makes sense for your financial situation. It accounts for key variables like tax brackets, investment growth, and tax payment sources to give a personalized projection.
Financial planners often use similar calculations to help clients minimize lifetime tax liability, and this tool makes that same analysis accessible to individual savers without complex spreadsheets.
You can test multiple scenarios (e.g., changing retirement tax brackets or time horizons) to see how different choices impact your long-term savings.
Frequently Asked Questions
Is a Roth IRA conversion right for everyone?
No. Conversions are most beneficial if you expect to be in a higher tax bracket in retirement than you are currently, or if you want to avoid RMDs. If your retirement tax bracket is lower than your current bracket, a traditional IRA may be more advantageous.
Do I have to convert my entire traditional IRA balance?
No. You can convert any portion of your traditional IRA to a Roth. Partial conversions let you spread tax liability across multiple years to stay in a lower tax bracket.
Can I undo a Roth IRA conversion?
Yes, through a recharacterization, but this must be done by the tax filing deadline (including extensions) for the year of the conversion. After that, conversions are permanent.
Additional Guidance
Always consult a qualified tax professional before making large IRA conversions, as this tool provides estimates only and does not account for individual circumstances like other income sources, deductions, or changing tax laws.
Consider spreading conversions over multiple years if your traditional IRA balance is large, to avoid pushing yourself into a higher tax bracket in a single year.
Track your conversion results annually and adjust inputs as your financial situation, tax brackets, or retirement timeline changes.