Updated July 28, 2026. Quick answer: There are two, they measure different things, and they start on different dates. One decides whether earnings come out tax-free. The other decides whether converted principal escapes the 10% early-withdrawal penalty — and it starts fresh for each conversion.
Two clocks, two questions
| The earnings rule | The conversion rule | |
|---|---|---|
| Governs | Whether earnings are tax-free | Whether converted principal avoids the 10% penalty |
| Starts | Your first Roth contribution or conversion — once, ever | Each conversion separately |
| Applies if you are over 59½ | Yes — still needed for tax-free earnings | Generally no |
The consequence people miss: someone over 59½ who opens their first Roth today still waits five years for tax-free earnings. Age alone does not satisfy that clock. Opening a small Roth early — even with a token amount — starts it running years before you need it.
Why the conversion clock matters for early retirees
Each conversion carries its own five-year wait before that converted principal can come out penalty-free before 59½. That is the mechanism behind the conversion ladder, and it is why the ladder has to start five years before the money is needed.
Sources
IRC §408A (Roth IRAs); IRC §408A(d)(3) (conversions); IRC §1411 (net investment income tax); IRC §86 (taxation of Social Security benefits); IRC §6654 (estimated tax); Tax Cuts and Jobs Act (2017) §13611 (repeal of conversion recharacterisation). Cross-checked July 2026 against professional analyses. Indexed thresholds are described rather than asserted, because they change annually.
This states what the cited authority says. It is not tax advice, and a conversion interacts with the rest of your return in ways one page cannot see.