TSP Roth In-Plan Conversions in 2026: What Federal Employees Need to Know

The federal Thrift Savings Plan just got a significant new feature — and if you're within 10 years of retirement, it's worth understanding.

Starting in 2026, federal employees can do something that wasn't possible before: move money directly from their Traditional TSP balance into their Roth TSP, inside the plan. No withdrawal. No rollover. No early-access complications. Just a conversion — with a tax bill attached.

This is called an in-plan Roth conversion, and it's one of the most consequential TSP changes in recent memory.

Here's what it means, how it works, and what questions to ask before you decide.

What Is a TSP Roth In-Plan Conversion?

Before we get to the new rule, a quick refresher:

• Traditional TSP: Contributions are pre-tax. You reduce your taxable income today, but you pay income taxes when you withdraw in retirement.
• Roth TSP: Contributions are after-tax. No tax break today, but your money grows tax-free and qualified withdrawals in retirement are completely tax-free — including the earnings.

An in-plan Roth conversion lets you take existing money in your Traditional TSP and move it into the Roth TSP — without withdrawing it from the plan or triggering early withdrawal penalties.

The trade-off: the amount you convert is treated as ordinary income in the year the conversion happens. So if you convert $50,000, that $50,000 gets added to your taxable income for that year.

Once converted, however, that money is done being taxed. It grows tax-free, and qualified distributions in retirement are completely tax-free. And unlike Traditional TSP or traditional IRAs, Roth accounts are not subject to Required Minimum Distributions (RMDs) — meaning you aren't forced to take money out at age 73.

Why Did This Change Happen Now?

The in-plan Roth conversion option is part of a broader evolution of federal retirement savings rules tied to the SECURE 2.0 Act. The TSP has been rolling out these changes in phases, and 2026 marks the year the in-plan conversion feature becomes available to federal employees and uniformed service members.

TSP is also rolling out new digital tools alongside this — including a Roth conversion estimator — to help participants model the tax impact before making a decision. That's helpful, because the math here isn't one-size-fits-all.

Who Might Benefit From a Roth In-Plan Conversion?

This strategy is worth exploring if one or more of the following is true for you:

You expect to be in a higher tax bracket in retirement than you are today. If your pension, Social Security, and TSP withdrawals will all hit at once and push you into a higher bracket, paying taxes on a conversion at today's lower rate can be a smart move.

You want to reduce your future RMD burden. Traditional TSP balances are subject to Required Minimum Distributions starting at age 73. Those forced withdrawals can push up your taxable income and even affect Medicare premiums (through IRMAA surcharges). Moving money to Roth eliminates that obligation.

You're in a low-income year. If you're between jobs due to a RIF, took a year off, or have lower income for any reason, that can be an ideal time to convert at a lower tax cost.

You have time for the converted balance to grow. The longer your money has to compound tax-free after a conversion, the more valuable the Roth treatment becomes. If you're 10+ years from retirement, that's a meaningful runway.

Who Should Proceed Carefully — or Wait

Conversions aren't the right move for everyone. Consider pumping the brakes if:

You're in a high tax bracket right now. Converting a large balance when you're already in the 32% or 37% bracket means you're paying a lot of tax today to avoid potentially less tax later. The math may not work in your favor.

You can't pay the tax bill from outside the TSP. Ideally, you'd pay the taxes on the conversion from funds you have outside the TSP — not by taking extra withdrawals. If you'd have to pull from the TSP itself to cover the tax bill, you lose some of the conversion's benefit.

You're close to retirement with a large Traditional balance. Converting a very large balance quickly can spike your taxable income dramatically. A more gradual, multi-year conversion strategy may make more sense.

You haven't modeled the impact on Medicare premiums. Higher income can trigger IRMAA surcharges on Medicare Part B and Part D premiums. If you're near the income thresholds, a large conversion could cost you more in premiums than you'd save in taxes.

The New Mandatory Roth Catch-Up Rule for High Earners

There's one more 2026 TSP change worth knowing: if your wages exceed $150,000, catch-up contributions must now go into the Roth TSP. This is mandatory — you no longer have the option to make pre-tax catch-up contributions if you're above that threshold.

For federal employees near the top of the pay scale — especially Senior Executive Service employees or those at GS-15 — this changes the calculation. It means more of your contributions will be taxed upfront, but your catch-up contributions will grow and be withdrawn tax-free.

Contribution Limits Have Also Increased

For 2026, the standard TSP contribution limit increased to $24,500 (up from $23,500). If you're age 50 or older, the catch-up contribution limit is $8,000 — or $11,250 if you're between ages 60 and 63, thanks to the enhanced catch-up provision from SECURE 2.0.

That means employees in the 60-63 age window can contribute up to $35,750 total to the TSP in 2026. If some of that is going into Roth, the tax-free compounding adds up quickly.

A Decision That Deserves a Real Conversation

The TSP in-plan Roth conversion is a powerful tool — but it's not a one-size-fits-all answer. The right strategy depends on your current income, your expected retirement income, your time horizon, and how the conversion interacts with Social Security, Medicare, and your FERS pension.

This is exactly the kind of decision FedSecure was built to help with. We don't just explain the rules — we help you apply them to your specific situation, with numbers that actually mean something.

If you want to know how the 2026 TSP changes affect your retirement plan, start with our free Retirement Snapshot quiz — it gives you a personalized snapshot of where you stand in about five minutes.

Or if you're ready to look at your full picture, book a free Retirement Review with Gigi Bodwin. We'll walk through your TSP strategy, tax outlook, FERS pension, and more — so your retirement decisions are based on clarity, not guesswork.

Take the Free Retirement Snapshot Quiz

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Frequently Asked Questions

Q: What is a TSP in-plan Roth conversion and when did it become available?
A: A TSP in-plan Roth conversion allows federal employees to move money from their Traditional TSP balance to their Roth TSP balance inside the plan, without withdrawing the funds. This feature became available in 2026 as part of SECURE 2.0 Act implementation.

Q: Do I pay taxes when I convert Traditional TSP to Roth TSP?
A: Yes. The amount you convert is treated as ordinary income in the tax year the conversion occurs. You'll owe income tax on the converted amount at your current marginal tax rate.

Q: Will a TSP Roth conversion affect my Medicare premiums?
A: Potentially. If the conversion pushes your income above certain thresholds, it could trigger IRMAA surcharges on Medicare Part B and Part D premiums. It's important to model the full income impact before converting.

Q: Who is required to make Roth catch-up TSP contributions in 2026?
A: Federal employees earning more than $150,000 in wages are required to direct all catch-up TSP contributions to the Roth TSP in 2026. This is a mandatory change — pre-tax catch-up contributions are no longer an option for high earners.

Q: Is a TSP Roth in-plan conversion the same as rolling over to a Roth IRA?
A: No. An in-plan conversion keeps your money inside the TSP — you're just moving it from the Traditional balance to the Roth balance. A rollover would move your money out of the TSP entirely into an outside account. Both strategies have different rules, benefits, and trade-offs.