The Five-Year Rule for Roth TSP Conversions

The "five-year rule" sounds like a single tidy deadline. In reality, Roth accounts carry two different five-year clocks that do two different jobs, and most of the confusion around Roth conversions comes from mixing them up. This guide separates them, shows how each one touches money you convert inside your TSP, and gives you the practical takeaway so you do not trip a tax or penalty by withdrawing too soon.

Why there are two clocks, not one

Roth money gets its tax-free treatment only when you follow the rules on when you take it out. Two separate five-year periods govern that, and they answer two separate questions:

• The first clock decides whether your earnings come out completely tax-free.
• The second clock decides whether money you converted can avoid an early-withdrawal penalty.

They can run at the same time, but they are not the same rule. Let us take them one at a time.

Clock one: the five-year rule for tax-free earnings

For the growth inside a Roth account to come out entirely tax-free, two things generally have to be true: you must be at least 59 and a half, and your Roth account must have been open for at least five years. For a Roth balance inside the TSP, that five-year clock starts on January 1 of the year you made your first Roth TSP contribution.

The important detail for converters: your contributions and converted amounts can generally be accessed without income tax because they were already taxed, but the earnings on them are what the five-year-and-59-and-a-half test protects. Pull earnings out before you satisfy both conditions and that portion can become taxable.

One more wrinkle worth knowing: a Roth IRA and a Roth TSP keep separate clocks. If you later roll a Roth TSP into a Roth IRA, the timing does not automatically carry over the way people assume, so confirm how your clock is counted before you move money between them.

Clock two: the five-year rule for converted amounts

The second clock exists to stop people from using a conversion as a side door around the early-withdrawal penalty. Here is the logic. If you are under 59 and a half and take money straight out of a traditional balance, you generally owe a 10 percent penalty. The rule prevents you from converting that money to Roth and then immediately withdrawing it penalty-free.

So each conversion starts its own five-year clock. If you are under 59 and a half and withdraw converted money within five years of converting it, the 10 percent penalty can apply to that amount, even though you already paid income tax at conversion. Every separate conversion has its own separate clock, which is one reason people who convert across several years keep careful records.

What this means in practice

The five-year rules do not change whether a conversion is a good idea. They change the timeline on which it works. The practical guidance falls out cleanly:

• Convert money you will not need for a long while. A conversion is a long-horizon move, and these rules are exactly why.
• Do not convert dollars you might have to withdraw within five years, especially if you are under 59 and a half.
• Keep records of each conversion and its date, so you always know which clock applies to which dollars.
• If you are close to 59 and a half or close to a five-year mark, get the timing checked before you withdraw, because being off by a few months can matter.

Because these rules have age and timing details that depend on your exact situation, treat this as the map, not the turn-by-turn. Confirm the specifics with the official resources below and a professional before you rely on a withdrawal.

Frequently asked questions

Does the five-year rule mean I lose my money if I withdraw early?

No. It means part of an early withdrawal can be taxed or hit with a 10 percent penalty, depending on which clock and your age. You do not forfeit the balance, but you can lose some of the tax advantage that made converting worthwhile.

If I am already over 59 and a half, do these rules still matter?

The conversion penalty clock generally stops mattering once you are past 59 and a half, since the early-withdrawal penalty no longer applies. The account's own five-year clock for fully tax-free earnings can still apply if your Roth is newer than five years.

Do multiple conversions share one clock?

No. Each conversion starts its own five-year clock. If you convert in several different years, you are tracking several separate clocks, which is worth keeping clear records of.

Where can I read the official rules?

Start with the Thrift Savings Plan and the IRS resources below, and confirm your specific timing with a qualified professional. For the broader conversion decision, see our guides to the 401(k) in-plan Roth conversion and the backdoor Roth for federal employees.

Sources

• Thrift Savings Plan, Roth in-plan conversions: tsp.gov
• Internal Revenue Service, designated Roth accounts: irs.gov designated Roth account FAQs
• Internal Revenue Service, Roth IRA distributions: irs.gov IRA FAQs