Roth vs. Traditional TSP: Which Should You Choose?

The short version

The choice comes down to when you pay tax. Roth TSP takes tax now and can pay out tax free in retirement when the rules are met. Traditional TSP skips tax now and taxes the money when you withdraw it. A common way to frame it: if your tax rate is lower today than you expect it to be later, Roth can make sense, and if it is higher today, traditional can. A combat zone changes the math, because pay that is already tax free going into a Roth can come out tax free too. This is education, not a recommendation for your situation.

Source: TSP.gov

What is the real difference between Roth and traditional TSP?

It is the timing of the tax. Roth contributions come out of your pay after tax, so you pay now, and qualified withdrawals later can be tax free, including the earnings. Traditional contributions come out before tax, so you lower your taxable income now, and you pay ordinary income tax on the money when you take it out. Both live inside the same TSP account, share the same fund choices, and share the same annual contribution limit. You can split your contributions between them.

Source: TSP.gov

How do I think about my tax bracket now versus later?

Junior enlisted pay often sits in a lower tax bracket, and a big share of your compensation, like BAH and BAS, is not taxed at all. That can keep your taxable income low early in a career. If you expect to earn more later, in or out of uniform, paying tax now at a lower rate through Roth can look attractive. If you are in a higher bracket today, the up front deduction from traditional can matter more. Nobody can predict future tax law, so many members hedge by using some of each.

Source: TSP.gov

Why does a combat zone favor Roth for many troops?

When you serve in a designated combat zone, your pay can be tax exempt. If you route that tax exempt pay into the Roth TSP, the money went in without tax and qualified withdrawals can come out without tax, which is a rare setup. The TSP notes that traditional contributions from tax exempt combat pay do not count against the yearly elective deferral limit, while Roth contributions do count even when they come from tax exempt pay. That is a detail worth planning around before you deploy.

Source: TSP.gov

Does my choice change the government match?

No. Under the Blended Retirement System, the government's automatic and matching contributions go into your traditional balance, no matter whether your own contributions are Roth or traditional. That is a tax rule, not a penalty. To capture the full match, the key is to contribute at least 5 percent of your basic pay each pay period, in whichever type you choose.

Source: TSP.gov

Common questions

Can I contribute to both Roth and traditional at once?

Yes. You can split your contributions, and the combined total counts against the same annual elective deferral limit.

What is the 2026 contribution limit?

The TSP set the 2026 elective deferral limit at $24,500 for those under age 50. Catch-up limits apply for older members. Check tsp.gov for current figures, since they change yearly.

When are Roth earnings tax free?

Roth earnings are generally tax free once it has been 5 years since January 1 of your first Roth contribution and you are at least age 59 and a half, with other qualifying conditions.

If I deploy, should all my contributions be Roth?

Not necessarily. The combat zone Roth angle is powerful, but the right mix depends on your full tax picture. A free financial counselor can model it before you deploy.

Can I change my election later?

Yes. You can adjust your Roth and traditional split going forward at any time through your pay system, though you cannot re-label past contributions without a separate Roth in-plan conversion.

Does the match go into Roth if I choose Roth?

No. Government contributions go into the traditional balance regardless of your own election.

Where to get help

• Your installation personal financial counselor, free, through the Military and Family Support Center.
• TSP.gov, for calculators, limits, and account tools.
• Military OneSource, 800-342-9647.
• The IRS or a tax advisor for questions about your specific tax situation.

Verification Notes

• The 2026 elective deferral limit of $24,500 is drawn from TSP.gov guidance for 2026 and the January 2026 elective deferral fact sheet. Limits change annually. Re-verify before publish.
• Combat zone treatment of traditional versus Roth contributions is from the TSP January 2026 fact sheet (TSPFS7). Reviewer should confirm the current version.

Sources & links

• TSP.gov: Thrift Savings Plan
• TSP.gov: Annual Limit on Elective Deferrals fact sheet (January 2026)
• TSP.gov: 2026 TSP contribution limits

VetraFi does not provide financial, investment, tax, legal, or accounting advice. The content provided is for informational purposes only. You should consult your own advisors before engaging in any transaction.

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