Roth Conversion Ladder 5-Year Rule: Every Rung Starts Its Own Clock.

A founder sells their stake at 49. Most of the proceeds land in a taxable brokerage account, and $1.4 million sits in a rollover IRA that costs 10% on top of income tax to touch before 59½. Someone tells them about the Roth conversion ladder: convert a slice of the IRA every year, wait five years, then spend it with no tax and no penalty. The strategy is real and it is in the Code. What trips people is that the five years is not one waiting period. It is a separate clock for every rung.

The first clock belongs to you, not to any particular conversion. Under IRC §408A(d)(2)(B), no distribution is qualified until after the five-taxable-year period beginning with the first taxable year you contributed to any Roth IRA. Treas. Reg. §1.408A-6, Q&A-2 measures it from the first day of that year and counts a conversion as a start, so an account first funded by a 2026 conversion finishes at the end of 2030. You get one of these for life: it never restarts, and it controls whether earnings come out tax-free.

The second clock belongs to each conversion. Under §408A(d)(3)(F), if you take out money allocable to a conversion within the five-taxable-year period beginning with the year you converted, §72(t) is applied as if that money were includible in gross income. The distribution is not taxed again, because those dollars were taxed on the way in. The statute borrows the penalty and only the penalty, and §408A(d)(3)(F)(ii) limits it to the part of the conversion that was includible when you converted.

That last clause is why converted nondeductible basis, the kind left over from a backdoor Roth, carries no exposure: nothing was includible, so there is nothing for the 10% to attach to. Ladders run on pre-tax money, which is includible in full, so the whole rung is exposed for five years.

You do not get to pick which dollars come out. Treas. Reg. §1.408A-6, Q&A-8 stacks every distribution in a fixed order across all of your Roth IRAs treated as one account: regular contributions first, then conversions oldest to newest, then earnings. Within a year's conversions the taxable portion comes out first. That ordering is why a ladder works: the dollars you spend in 2031 are the 2026 rung whose clock finished, not the rung you converted last year.

Your old regular Roth contributions also sit in front of everything else. They come out tax-free and penalty-free at any age with no clock, so someone with fifteen years of contributions behind them often has part of the bridge already built.

This is what kills ladders in practice. Convert in 2026 and the first penalty-free dollar arrives January 1, 2031. Until then you need five years of living expenses from somewhere else: taxable brokerage money, existing Roth contributions, a severance, or the proceeds of the sale that started all of this. Retire at 49 with everything inside a traditional IRA and the ladder does nothing for half a decade.

Two alternatives cover the gap and both should be priced. A series of substantially equal periodic payments under §72(t)(2)(A)(iv) starts paying immediately and locks you into a fixed schedule for five years or until 59½, whichever is longer. If the money still sits in a 401(k) and you separated from that employer in or after the year you turned 55, the rule of 55 reaches it penalty-free now. Use those for the gap years and run the ladder behind them.

The clock runs on taxable years, not 365-day periods, and starts on the first day of the year you convert. A conversion made January 2, 2026 and one made December 31, 2026 both clear on January 1, 2031. The December one waited four years and one day. The January one waited four years and 364 days. Same tax, same rung, a year of difference in how long the money is locked up.

December also lets you size the rung against a year you have already lived through: dividends, realized gains, K-1s, and whether the consulting work you picked up in October moved you into the next bracket. The decision is permanent. Section 13611 of the Tax Cuts and Jobs Act repealed recharacterization for conversions made after 2017, and §408A(d)(6)(B)(iii) now says so in the Code.

• –Withholding out of the IRA. Tell the custodian to hold back 20% for taxes while you are under 59½ and that 20% never reaches the Roth. It is an early distribution, taxable and penalized, and the rung shrinks by the same amount. Pay the tax from outside money.
• –The ACA subsidy cliff. A conversion is ordinary income, and for 2026 the hard cliff at 400% of the federal poverty line is back with no cap on repaying advance credits. An early retiree on a marketplace plan can convert $20,000 and hand back a full year of subsidy.
• –Roth 401(k) money. The ordering rules above are IRA rules. A nonqualified distribution from a designated Roth account inside a 401(k) splits pro rata between basis and earnings under §72(e)(8), so there is no contributions-first layer. Roll it to a Roth IRA first.
• –Treating accounts as separate. The ordering rule is per person, not per account. A fresh Roth IRA for each year's conversion does not let you choose a rung, because every Roth IRA you own is aggregated before the layers apply.

The paperwork is what carries the plan through an IRS notice. The conversion lands on Form 1040 line 4b in the year you make it, and every later Roth distribution goes on Form 8606, Part III, where you walk the ordering rules yourself. A Form 1099-R coded J means an early Roth distribution with no known exception, which is what a custodian issues when it cannot see your clocks. It is on you to show on Form 5329 that the money was old conversion principal past its five years, so keep every conversion confirmation.