Roth TSP’s hidden second five-year clock

1. Two clocks, one word

The tax code uses one phrase, “five-year period,” for two different rules that live in two different sections. Section 402A governs designated Roth accounts inside employer plans, which is what the Roth TSP is. Section 408A governs Roth IRAs. Each section has its own five-year requirement for tax-free earnings, each starts on its own trigger, and neither knows the other exists. A distribution is qualified, and its earnings tax-free, only when the clock belonging to the account making the payment has run out and you are 59½, disabled, or deceased.

That is the whole problem in one sentence: the clock that matters is the clock attached to the account the money is in when you take it out. Money that was qualified in the TSP can become nonqualified in a Roth IRA, and the reverse. Everything else in this guide follows from that.

2. The Roth TSP clock

The Roth TSP five-year period begins on January 1 of the first tax year in which you made a Roth contribution to the TSP, or, if you never contributed, the first tax year in which you made an in-plan Roth conversion. It runs across your civilian and uniformed-services TSP accounts together, and it does not restart if you separate and later return to federal service. If you roll a Roth 401(k) or 403(b) from a former employer into the Roth TSP, the TSP uses the earlier of the two plans’ start dates, so a rollover into the TSP can only help you.

Two features of the TSP clock catch people out.

The January 1 rule works in your favor. A Roth contribution from your last paycheck of December 2026 starts the clock on January 1, 2026. It is satisfied on January 1, 2031, four years and a few weeks after the money went in. One pay period of Roth contributions, timed at year-end, buys almost a full year of clock.

Every Roth TSP payment is pro rata. A Roth IRA lets you take contributions out first, tax-free, before touching earnings. The TSP does not. Each payment from your Roth balance is a proportional slice of contributions and earnings, in the same ratio they hold in the account. If your Roth TSP is $100,000 of which $70,000 is contributions and $30,000 is earnings, a $10,000 payment before the clock is satisfied is $7,000 of tax-free contributions and $3,000 of taxable earnings, and if you are under 59½ without an exception, the $3,000 may carry the 10% penalty as well. There is no way to draw only the contributions. See Roth vs. traditional TSP for how the Roth and traditional balances are tracked separately.

3. The Roth IRA clock

The Roth IRA five-year period begins on January 1 of the tax year of your first contribution or conversion to any Roth IRA you have ever owned. It is a single clock for all of your Roth IRAs combined, it never restarts, and it survives closing an account: if you opened a Roth IRA in 2009, contributed $500, and later withdrew it and closed the account, your Roth IRA clock still started in 2009. This is why the advice in this guide is so cheap to follow. Any contribution, at any time in your life, starts a clock that then counts for every Roth IRA dollar you will ever hold.

Roth IRAs also follow ordering rules that the TSP does not. Withdrawals are treated as coming first from regular contributions (always tax- and penalty-free), then from converted amounts (oldest first), and only last from earnings. So a nonqualified Roth IRA distribution is tax-free until you have withdrawn every dollar you ever contributed or converted. That is a meaningful advantage over the TSP’s pro-rata rule, and it is one of the legitimate reasons some retirees roll Roth TSP to a Roth IRA, provided the IRA clock is already satisfied.

Converted amounts carry one extra rule. Each conversion has its own five-year period for the 10% penalty, separate from the earnings clock: withdraw converted money within five years of that conversion while under 59½ and the penalty applies to the converted amount, even though it was already taxed when converted. Once you are 59½ this conversion-penalty clock is irrelevant. The earnings clock, the one that starts with your first-ever Roth IRA dollar, still applies at any age.

4. The rollover: what resets and what doesn’t

When Roth TSP money moves to a Roth IRA, the Roth IRA’s clock governs from that point. Three cases cover nearly everyone.

Case 1: you already had a Roth IRA for five or more years

Nothing bad happens. The IRA clock is satisfied. If you are also 59½, every dollar, including the TSP earnings you rolled in, is qualified and tax-free immediately. This is the outcome the rest of this guide is trying to arrange for you.

Case 2: your Roth TSP distribution was already qualified when you rolled it

If you were 59½ and the TSP clock was satisfied at the time of the rollover, the TSP paid you a qualified distribution, and the IRS treats the entire rolled amount, earnings included, as regular contributions in the Roth IRA. Under the ordering rules, regular contributions come out first and are always tax-free. So even if the Roth IRA is brand new, the rolled money itself can be withdrawn without tax at any time. Only the earnings that money generates inside the new IRA are subject to the IRA’s fresh five-year clock. This softens the problem considerably, but does not eliminate it: those new earnings are taxable if touched in the first five years, and many retirees do not realize they are drawing them.

Case 3: your Roth TSP distribution was not yet qualified when you rolled it

This is the expensive one. If you rolled before 59½, or before the TSP clock ran, the TSP paid a nonqualified distribution. In the Roth IRA, your original TSP contributions are treated as regular contributions (tax-free under the ordering rules), but the TSP earnings arrive as earnings, and they sit behind a Roth IRA clock that, if the IRA is new, started on the day you opened it. Draw on them in the next five years and they are taxable. A retiree at 57 who separates under the Rule of 55, rolls everything to a new IRA, and starts living on it has done exactly this, and has also reinstated the 10% penalty the Rule of 55 had removed.

5. The two clocks on a timeline

The figure follows one employee through both clocks. She starts Roth TSP contributions in 2022. She opens a Roth IRA with a small contribution in 2027 on this guide’s advice. She retires and rolls Roth TSP to the Roth IRA in 2032. Because the IRA clock started in 2027, it is satisfied on January 1, 2032, before the rollover. Had she waited to open the IRA until retirement, the IRA clock would run to 2037.

6. In-plan conversions and the recapture rule

Since January 28, 2026, TSP participants can convert traditional balances to Roth without leaving the plan. Conversions interact with the clock in two ways, one helpful and one that bites.

Helpful: if you have never had Roth TSP money, your first in-plan conversion starts the Roth TSP five-year clock, on January 1 of that tax year. A small conversion in December 2026 starts the clock on January 1, 2026, exactly as a contribution would. If you are retired, in a low bracket, and planning a multi-year conversion ladder, converting a token amount in year one starts the clock for everything that follows.

Bites: each converted amount carries its own five-year recapture period for the 10% penalty. If you withdraw the converted amount within five years of the conversion and you are under 59½, the 10% penalty applies to that amount, even though you already paid income tax on it when you converted. This mirrors the Roth IRA conversion rule and exists to stop people using a conversion as a way around the early-withdrawal penalty. After 59½ the recapture rule falls away; the earnings clock does not. A retiree converting at 57 under the Rule of 55 should therefore treat converted dollars as untouchable until 59½ or until five years pass, whichever comes first, and draw traditional dollars in the meantime. The mechanics of the conversion itself, including the 26-per-year limit and the $500 minimum, are in the in-plan conversions guide.

One more interaction, because the TSP’s pro-rata rule applies here too: converted amounts join the Roth balance and are paid out pro rata with everything else. You cannot direct the TSP to leave the recently converted dollars alone. If you expect to draw Roth TSP before 59½, keep conversions small or defer them.

7. Starting both clocks today

The entire fix costs one small Roth TSP election and one small Roth IRA contribution, ideally at least five years before you expect to touch either account. Here is the sequence.

• Check whether a clock is already running. Log in to tsp.gov: your account history shows the first Roth contribution date, if any. For the IRA, any Roth IRA you have ever funded, at any custodian, started the clock; find the year of the first contribution. If you have a satisfied clock in both accounts, you are done.
• Start the TSP clock if it isn’t running. Change one pay period of contributions to Roth, then change it back if you prefer traditional. December is the cheapest month to do it, because January 1 of that year becomes your start date.
• Open a Roth IRA and fund it with any amount. $100 is enough. Direct contributions are allowed in 2026 up to $7,500 ($8,600 at 50+) if your MAGI is below $153,000 single or $242,000 joint, with a partial contribution up to $168,000 and $252,000. Designate the contribution for the earliest tax year still open: a contribution made by April 15, 2027 can be designated for 2026, and the clock starts January 1, 2026.
• Over the limit? Use the backdoor. Contribute to a traditional IRA (no income limit on contributing, only on deducting), then convert it to a Roth IRA. If you have no other pre-tax IRA money the conversion is essentially tax-free and it starts the Roth IRA clock. If you do hold pre-tax IRA balances, the pro-rata rule makes part of the conversion taxable; roll those balances into the TSP first, since TSP balances are not counted, and the backdoor becomes clean.
• Write down both start dates and put them with your retirement papers. You will need them the day someone hands you a rollover form.
• At retirement, roll only when the IRA clock is satisfied and you are 59½, or roll only the traditional balance and leave Roth TSP in the TSP until both tests are met. A partial rollover is allowed and often the right answer.

8. Three worked cases

Case A: the seminar rollover

Dana, 58, separates under the Rule of 55 with $220,000 in Roth TSP ($160,000 contributions, $60,000 earnings), first Roth contribution 2015. She has never had a Roth IRA. At a retirement seminar she rolls everything into a new Roth IRA. The TSP clock was satisfied, but she was under 59½, so the distribution was nonqualified: her $160,000 arrives as contributions, the $60,000 as earnings behind a 2026 IRA clock. She draws $30,000 a year. Under the ordering rules, the first five years of draws come entirely from the $160,000 of contributions and are tax-free, so the IRA clock never actually costs her tax. But she has lost the Rule of 55: every dollar she takes before 59½ from the IRA is potentially penalized, though contributions are exempt from penalty under the ordering rules too. She escaped by the narrow margin of having a large contribution basis. A colleague with $60,000 of contributions and $160,000 of earnings would not.

Case B: the token IRA

Marcus, 55, has $300,000 in Roth TSP with a 2019 start date and no Roth IRA. He opens one in 2026 with $500 and designates it for tax year 2026. His IRA clock runs from January 1, 2026 to January 1, 2031. He retires at 60 in 2031. Both clocks are satisfied and he is over 59½: he can roll all, some, or none of his Roth TSP to the IRA, and every dollar is qualified wherever it sits. Total cost of the fix: $500 he still owns, plus fifteen minutes.

Case C: the retired converter

Priya retires at 57 with $900,000 in traditional TSP and no Roth anything. Her pension is $42,000, so she has room to convert about $40,000 a year at 12%. Her first in-plan conversion in 2026 starts the Roth TSP clock on January 1, 2026; it is satisfied January 1, 2031, when she is 62. Each year’s conversion also carries its own five-year recapture period for the penalty, but that stops mattering at 59½ in 2028. Her plan: convert annually, draw traditional TSP for income until 59½, and leave every Roth dollar untouched until 2031. In parallel she does a $100 backdoor Roth IRA in 2026, so that if she ever wants Roth IRA ordering rules or a consolidation, that clock is satisfied on the same day.

9. Frequently asked questions