Roth TSP vs. Roth IRA: which to fund first (or both)
They sound like the same thing, and the tax deal is the same — money in after tax, growth out tax-free. But the rules diverge in ways that decide which one deserves your next dollar: contribution limits, income caps, investment choice, and access. Here’s the head-to-head, and the order that works for most federal savers in 2026.
1. Same tax deal, different rules
Both accounts work the same way at the core: you contribute money you’ve already paid tax on, it grows, and qualified withdrawals in retirement come out completely tax-free. If that were the whole story, it wouldn’t matter which you used. It isn’t — the rules around limits, income eligibility, investment choice, and access are different enough to change the answer for most people.
Get those differences straight and the “which first” question mostly answers itself.
2. The head-to-head
| Feature | Roth TSP | Roth IRA |
|---|---|---|
| 2026 contribution limit | $24,500 (shared with traditional TSP) | $7,500 ($8,600 at 50+) |
| Income limit to contribute | None | Phases out $153–168k single / $242–252k joint |
| Investment choice | 5 core funds + lifecycle | Nearly any fund or ETF |
| Fees | Among the lowest anywhere | Depends on what you buy |
| Access to contributions | Locked until 59½ (with rules) | Withdraw contributions anytime, tax/penalty-free |
| Employer match | Yes — but match goes to traditional | N/A |
| Lifetime RMDs | None (since 2024) | None, ever |
3. Where the Roth IRA wins
Investment freedom. The TSP’s five funds are a feature — simple and cheap — but also a ceiling. A Roth IRA at any brokerage lets you hold essentially any low-cost index fund, sector, or ETF you want.
Access. This is the underrated one. You can withdraw your Roth IRA contributions (not earnings) at any time, for any reason, with no tax and no penalty. That makes the Roth IRA double as a deep backstop — retirement money that’s also reachable in a true emergency. The Roth TSP doesn’t offer that kind of flexible access.
Tax diversification. Most federal savers are heavy in traditional balances, because the match always lands in traditional and many contribute traditional too. A Roth IRA builds a genuinely tax-free pool that gives you control over your tax bracket in retirement.
4. Where the Roth TSP wins
Capacity. It’s not close. The Roth TSP shares the $24,500 TSP limit, more than triple the Roth IRA’s $7,500. If you want to move serious money into tax-free space, the Roth TSP is where the room is.
No income limit. A Roth IRA phases out at higher incomes; the Roth TSP has no income cap at all. A dual-income federal household can easily earn its way out of direct Roth IRA eligibility while still pouring money into the Roth TSP.
Fees. TSP expense ratios are among the lowest in the world. For large, decades-long balances, that fee advantage quietly compounds in your favor.
Think of it this way: the Roth IRA is the flexible bucket, the Roth TSP is the big bucket. Most federal savers want some of each — flexibility for the near term, capacity for the long haul.
5. Which to fund first — or both
For most federal employees, the sequence is:
| Step | Do this | Why |
|---|---|---|
| 1 | TSP to 5% (the match) | An instant 100% return — always first, Roth or traditional |
| 2 | Max the Roth IRA | Flexibility, full investment choice, penalty-free access to contributions |
| 3 | Add to the Roth TSP | Now use the big, low-fee bucket for the rest of your tax-free savings |
And “both” is the common answer. Because the limits are separate, an eligible saver can fund the Roth IRA and the Roth TSP in the same year — the flexible bucket and the big bucket, working together.
6. The high-earner angle
If your income is above the Roth IRA phase-out — over $168,000 single or $252,000 married filing jointly in 2026 — the calculus shifts. You can’t contribute to a Roth IRA directly, so the Roth TSP does the heavy lifting, since it has no income cap. Many high earners still get money into a Roth IRA through the “backdoor” conversion, but that has its own pitfalls; the Roth TSP is the simpler, larger tax-free home when your income closes the front door on the Roth IRA.
Both Roth accounts now share a nice feature: no lifetime required minimum distributions. The Roth IRA never had them, and thanks to SECURE 2.0, the Roth TSP shed them in 2024 — so both can compound tax-free for as long as you want.
7. FAQ
What's the difference between a Roth TSP and a Roth IRA?
Both are after-tax with tax-free qualified growth. The Roth TSP shares the $24,500 TSP limit, has no income cap, offers five low-cost funds, and gets no direct match. The Roth IRA has a $7,500 limit ($8,600 at 50+), lets you invest in almost anything, has income limits, and lets you withdraw contributions anytime tax- and penalty-free.
Which do I fund first?
After the 5% match, most savers max the Roth IRA first (flexibility and access), then add to the Roth TSP (capacity and low fees). High earners over the Roth IRA income limit lean on the Roth TSP, which has no income cap.
What are the 2026 Roth IRA income limits?
Direct contributions phase out between $153,000 and $168,000 (single/HoH) and $242,000 and $252,000 (married filing jointly). Above those, use a backdoor conversion — or lean on the Roth TSP, which has no income limit.
Does the Roth TSP have RMDs?
No. SECURE 2.0 removed lifetime RMDs from Roth employer-plan balances, including the Roth TSP, starting in 2024 — matching the Roth IRA, which never had them.
Can I use both?
Yes. Separate limits mean an eligible saver can fund the Roth TSP up to its limit and a Roth IRA up to $7,500 ($8,600 at 50+) in the same year — the standard move for building a large tax-free bucket.