Traditional Versus Roth TSP in Retirement

Many federal employees who contributed to the TSP over their careers have both a Traditional balance and a Roth balance. The two are taxed differently — both during accumulation and at withdrawal — and that difference can affect how you plan distributions in retirement.

This article provides a neutral educational overview of Traditional and Roth TSP treatment in retirement. It is not tax advice and does not constitute a recommendation to favor one balance over the other. Tax rules are complex and change over time. Consult a qualified tax professional before making decisions based on your TSP balance composition.

General tax-treatment differences

Traditional TSP contributions are made on a pre-tax basis. The money goes in before federal income tax is applied, reducing your taxable income in the year of contribution. Withdrawals in retirement are taxed as ordinary income in the year you receive them.

Roth TSP contributions are made on an after-tax basis. You pay income tax on the money before it goes in. Qualified Roth withdrawals in retirement — including earnings — are generally tax-free, provided the account has been open for at least five years and you are at least 59½. See IRS Publication 721 and TSP.gov for current qualification rules.

Withdrawal considerations

When you take a distribution from the TSP, the plan applies a pro-rata rule: if you have both Traditional and Roth balances, each withdrawal is drawn proportionally from both. You cannot choose to withdraw only from one balance type while leaving the other untouched within the TSP.

This pro-rata treatment differs from how some IRAs work, where you may have more flexibility to direct withdrawals from a specific account. If separating your Traditional and Roth balances into different accounts would serve your tax planning, a rollover to an IRA may be worth discussing with a qualified financial and tax professional. A rollover is not automatically appropriate; evaluate the trade-offs carefully.

Required-distribution considerations

Traditional TSP balances are subject to required minimum distributions (RMDs) beginning at the age specified by current IRS rules. Failure to take the required amount results in a significant IRS penalty. The TSP will calculate and distribute your RMD automatically if you have not already begun withdrawals.

Roth TSP balances are also subject to RMDs while the funds remain in the TSP — unlike Roth IRAs, which are not subject to RMDs during the original owner's lifetime. If avoiding RMDs on your Roth balance is a planning priority, rolling the Roth TSP balance to a Roth IRA may be worth discussing with a qualified professional. See IRS.gov and TSP.gov for current RMD rules, as these rules have changed in recent years and may change again.

Coordinating Traditional and Roth balances

The presence of both Traditional and Roth balances gives you some flexibility in managing your taxable income in retirement — but only if you plan carefully. Because TSP withdrawals are pro-rata, the coordination often involves decisions about whether and when to roll balances to IRAs, how to sequence withdrawals across accounts, and how TSP distributions interact with Social Security, pension income, and other assets.

There is no single correct approach. The right strategy depends on your current and expected future tax brackets, your other income sources, your survivor and estate goals, and your timeline. These are questions for a qualified financial and tax professional who can review your complete picture.

Questions to discuss with qualified tax and financial professionals

• What is the approximate split between my Traditional and Roth TSP balances?
• What is my expected tax bracket in retirement, and how does it compare to my current bracket?
• How does the pro-rata withdrawal rule affect my distribution planning?
• Do I want to manage RMDs on my Roth balance, or would a Roth IRA rollover be worth evaluating?
• How do my TSP balances fit into my broader retirement income picture alongside my pension and Social Security?
• Have I reviewed the current IRS rules on Roth qualification and required minimum distributions?