TSP Roth Conversion Calculator

Estimate the immediate tax impact of converting your Traditional TSP funds to a Roth TSP account.

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How to Use This Calculator

  • • Enter the amount you want to convert from Traditional to Roth TSP
  • • Include your other taxable income for the year
  • • Select your tax filing status
  • • See the immediate tax impact and long-term growth comparison
  • • Remember: You must pay the conversion tax with outside funds for maximum benefit

Should You Convert to a Roth TSP?

Estimate the immediate tax impact of converting your Traditional TSP funds to a Roth TSP account.

For Illustrative Purposes Only - Please Read

  • Official Rules Pending: The SECURE 2.0 Act authorized in-plan Roth TSP conversions, but the TSP has not yet released the official rules or timeline. This calculator operates under current IRS rules for 401(k)-to-Roth conversions, which may differ from the final TSP implementation.
  • Taxes Are Due Now: The entire amount you convert is added to your taxable income for the year of the conversion. You will owe federal (and potentially state) income tax on this amount.
  • Pay Taxes with Outside Funds: To get the full benefit, you must pay the conversion tax with money from a separate source (like a bank account). If you use money from your Traditional TSP to pay the tax, that portion is considered a taxable distribution and may be subject to a 10% early withdrawal penalty if you are under age 59½.

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Important Notes

  • This calculator uses 2024 federal tax brackets for illustrative purposes
  • State taxes are not included in these calculations
  • The TSP has not yet implemented in-plan Roth conversions - check TSP.gov for updates
  • Consult with a qualified tax professional before making any conversion decisions