Key Takeaways
- Traditional and Roth TSP accounts are taxed differently at both contribution and withdrawal stages.
- Choosing between them depends on your current tax situation, expected retirement income, and federal employment status.
For federal employees, understanding your Thrift Savings Plan (TSP) choices is a foundation for future retirement security. The tax treatment and withdrawal rules for Traditional and Roth TSP accounts can shape your after-tax income for years to come. This article breaks down how each works so you can make clear, educated decisions about your savings.
What Is a Traditional TSP Account?
Contribution basics and eligibility
The Traditional TSP account has long been available to federal employees and members of the uniformed services. If you’re eligible to contribute to TSP, you can choose to direct part of your salary to the Traditional TSP. All federal employees with TSP access, whether under FERS, CSRS, or as uniformed services personnel, can contribute—subject to annual IRS limits.
Overview of tax treatment
Contributions to a Traditional TSP account come from your pay before federal income taxes apply. This means your taxable income for the year is lowered by the amount you contribute, up to those annual limits. Over time, both your contributions and any investment growth remain tax-deferred, so you don’t owe taxes while your savings grow. Taxes are applied only when you make withdrawals, typically in retirement.
What Is a Roth TSP Account?
Contribution qualifications
Roth TSP was introduced as an option for those who want different tax treatment on their retirement savings. Like the Traditional TSP, any eligible federal employee or service member can make Roth contributions—no additional requirements beyond TSP participation. However, keep in mind the combined annual IRS limit applies to your total Traditional plus Roth TSP contributions.
How Roth tax features work
Roth TSP contributions are made with money that’s already been taxed. This means your take-home pay is reduced by the amount you choose to contribute (since taxes are withheld first). Both your contributions and any earnings in the Roth TSP grow tax-free. Withdrawals can be tax-free, too, if specific federal requirements are met: you must have held the Roth TSP for at least five years, and you must be age 59½ or older (or meet certain disability or beneficiary conditions).
How Do Tax Rules Differ Between Options?
Taxation during contributions
The main difference begins at the moment you contribute. For Traditional TSP, contributions lower your current taxable income—immediate tax savings. Roth TSP contributions, by contrast, are made after taxes are taken, offering no upfront tax benefit. Your paycheck is taxed in full, then your Roth contribution is withheld.
Taxation at withdrawal
When you take money out in retirement, Traditional TSP withdrawals are fully taxable as ordinary income. The IRS treats these distributions much like a paycheck. For Roth TSP withdrawals, qualified distributions are federal income tax-free. To be qualified, the following must be true:
- The withdrawal occurs at least five years after your first Roth contribution, and
- You are at least 59½, permanently disabled, or deceased (beneficiary withdrawals).
If you don’t meet these qualifiers, earnings withdrawn from the Roth TSP may be subject to taxes and potential penalties.
How Are Withdrawals Handled?
TSP withdrawal process overview
Both Traditional and Roth TSP participants have similar choices for accessing funds. Once you are eligible, you may opt for installment payments, partial lump sums, or annuity purchases directly through TSP. Withdrawals can be split between Traditional and Roth, and you can decide how much comes from each source if both are present in your account.
When requesting a distribution, care is needed to ensure the right mix for your tax goals. The TSP provides clear forms and online management tools to facilitate these actions. Keep in mind, you typically cannot selectively withdraw only contributions or only earnings from your Roth TSP—they are distributed proportionately.
Required minimum distributions
Federal rules require you to begin taking minimum distributions (RMDs) from your TSP accounts, Traditional or Roth, starting by April 1 following the calendar year you turn age 73 (as of 2026). While the Traditional TSP RMDs are fully subject to income tax, Roth TSP RMDs are not taxed if the distribution is qualified. You must take RMDs from both types if you hold balances in each, regardless of whether you need the income at that time.
Which Option Fits Your Retirement Goals?
Factors to consider
Choosing between Traditional and Roth TSP contributions involves some self-assessment. Important factors to weigh include:
- Current income versus anticipated retirement income
- Likelihood of being in a higher or lower tax bracket in retirement
- Need for tax diversification and flexibility later
- How much time you have until retirement (especially with regard to the Roth’s five-year rule)
For some, maximizing take-home pay now (Traditional) matters more, while others may value tax-free withdrawals in the future (Roth). Some federal employees choose to split contributions between both options for flexibility.
Federal employment scenarios
If you expect your federal salary to rise over time, or if you think tax rates will increase in the future, Roth TSP contributions may appeal to you. If you’re close to retirement, or expect income (and taxes) to go down in retirement, Traditional contributions might be more attractive. Your years of service, FERS or CSRS coverage, and expected pension benefits can all play a role in your decision.
Can You Switch Between Roth and Traditional?
Examining transfer and conversion rules
While you can change how your new contributions are allocated between Traditional and Roth at any time, you cannot convert existing Traditional TSP balances to Roth within the TSP itself. New contributions made after changing your election will follow your updated choice, but no in-plan conversion feature is currently available, as of 2026.
Important considerations and constraints
Should you leave federal service, you may have additional choices—such as rolling your TSP into an IRA that does permit conversions. Always check current rules with TSP or OPM resources before making changes, as plan features can evolve. Remember, transferring funds out may alter fees, protections, or plan benefits unique to TSP accounts.
Frequently Asked Questions About TSP Tax Rules
Federal tax impacts
The TSP accounts are governed by federal laws, and withdrawal rules align with IRS guidelines. For both account types, qualified withdrawals avoid early-withdrawal penalties after age 59½. State tax rules on withdrawals may differ—always refer to state guidance for your specific situation.
Common withdrawal questions
All regular withdrawals are processed by the TSP (not an outside provider), and split proportionally between Traditional and Roth balances unless you specify otherwise. The five-year Roth tax qualification period starts with your first Roth contribution—not each deposit.
