In this guide
What a Roth conversion ladder actually is
A Roth conversion ladder is not a product or an account type. It is a schedule — converting a deliberate slice of a traditional IRA or 401(k) into a Roth every year for a run of years, instead of converting once. The mechanics of a single rung are ordinary, and covered in the Roth conversion guide. What makes the ladder its own strategy is why you repeat it: you stopped working before 59½ and need to reach pre-tax money without paying a 10% penalty for the privilege. It does two jobs at once — converting at rates only a retiree with no paycheck can access, and manufacturing a stream of penalty-free principal that begins exactly five years after you start.
The rule the whole thing hangs on
Every conversion carries a separate five-year clock — one per conversion, per year. Under the ordering and recapture rules in IRS Publication 590-B, converted principal withdrawn before its own clock finishes and before 59½ gets the 10% additional tax under §72(t), even though you already paid income tax on it. Three details do the work:
- The clock starts January 1 of the conversion's tax year, not the day the transfer settles. A conversion executed December 20, 2026 is treated as starting January 1, 2026 — penalty-free on January 1, 2031. Convert late and roughly eleven months of the wait are free.
- Rungs come out oldest first. Conversions are withdrawn FIFO, which is exactly what makes a ladder work.
- 59½ switches the rule off entirely.
This is the conversion clock — the one about the penalty — a different rule from the clock governing when earnings turn tax-free. The order-of-money guide separates the two side by side and lists every penalty exception; the pillar guide covers how both apply to conversions generally.
The ladder year by year (retiring at 45)
A couple retires at 45 in 2026, spends $60,000 a year, and converts one year of expenses annually. Read the fourth column as the promise the ladder makes: convert in year N, spend it in year N+5.
| Year | Age | Convert | That rung unlocks | Spending comes from |
|---|---|---|---|---|
| 2026 | 45 | $60,000 | Jan 1, 2031 | Taxable brokerage |
| 2027 | 46 | $60,000 | Jan 1, 2032 | Taxable brokerage |
| 2028 | 47 | $60,000 | Jan 1, 2033 | Taxable brokerage |
| 2029 | 48 | $60,000 | Jan 1, 2034 | Taxable brokerage |
| 2030 | 49 | $60,000 | Jan 1, 2035 | Taxable — last bridge year |
| 2031 | 50 | $60,000 | Jan 1, 2036 | The 2026 rung — penalty-free |
| 2032 | 51 | $60,000 | Jan 1, 2037 | The 2027 rung |
| … | … | … | … | …each rung, five years later |
| 2035 | 54 | Last rung needed | Jan 1, 2040 | The 2030 rung |
| 2040 | 59½ | Bracket reasons only now | — | Any Roth dollar — clocks no longer apply |
Illustrative only. Amounts are held flat for clarity; in practice re-size each rung annually.
Notice the shape: the last rung you strictly need is the one unlocking the year before you turn 59½. Converting past that point is often still smart — shrinking the pre-tax balance before RMDs arrive — but that is a bracket decision, not a ladder decision.
The first five years: the bridge
The ladder's one genuine weakness is the gap at the start. For five years you convert money you cannot touch, pay tax on it, and live on something else. If the bridge runs out in year four the ladder collapses — you pull an unseasoned rung and pay the 10% you spent four years avoiding. Size it as five years of spending plus five years of conversion tax: at $60,000 of spending and roughly $6,000 of tax per rung, about $330,000 outside the ladder. What qualifies:
- Taxable brokerage — the primary bridge. Long-term gains can be taxed at 0% federally in a low-income year, but they still stack into the MAGI that governs your ACA subsidy.
- Roth contributions you already made. Tax- and penalty-free at any age, ahead of everything else in the ordering rules — the cleanest bridge dollar there is.
- Cash and short-duration bonds — boring, and exactly right for a liability with a known five-year date.
- 72(t) / SEPP payments as a fallback: pre-tax money penalty-free without waiting, but locked into a fixed distribution for five years or until 59½, whichever is longer.
Pay the conversion tax from the bridge, never from the conversion. Tax withheld from the converted amount while you are under 59½ is treated as a distribution — taxable and penalized — instead of a conversion. Convert the gross amount, pay the tax from taxable money, and the full rung seasons.
How big should each rung be?
Not "one year of expenses" — that is the shape of the ladder, not the size of the rung. Rungs are sized by the bracket you are willing to pay, and an early retiree with no wages has unusual amounts of cheap room to fill. Using the 2026 figures in IRS Rev. Proc. 2025-32 — the brackets our calculator runs on — here is the most you can convert before the next dollar costs 22%:
| Filing status | Standard deduction | Top of the 12% bracket | Max conversion at ≤12% | Federal tax | Effective rate |
|---|---|---|---|---|---|
| Married filing jointly | $32,200 | $100,800 taxable | $133,000 | $11,600 | 8.7% |
| Single | $16,100 | $50,400 taxable | $66,500 | $5,800 | 8.7% |
Federal only, no other income, no state tax. State income tax can add several points.
That is bracket-filling: dollars a household paid 22% or 24% on while working, handed back at a blended 8.7%. Two caveats. Anything else in income that year — bridge capital gains, a spouse's part-time work, a pension — stacks underneath the conversion and eats the cheap room first. And filling the bracket to the brim is only right if your future rate really is higher.
This is what the calculator was built for. Its "spread conversion over several years" path is a real laddered model, not a lump sum with a footnote: set the number of rungs from 1 to 15 and your income for the year, and it re-slices the balance, re-taxes each rung against the 2026 brackets, and shows the blended result against converting all at once. No other article on this topic gives you an interactive ladder. Run your own rather than borrowing someone else's.
The ACA subsidy problem
Here is the part most FIRE explainers wave at, and it can be the largest number in the plan. Retire before 65 and you are probably buying marketplace coverage, where the premium tax credit is calculated from modified adjusted gross income. A conversion is ordinary income, so every dollar you convert raises the MAGI that sets your subsidy — the IRS says so plainly in its premium tax credit guidance.
The arithmetic is unforgiving in 2026: the enhanced subsidies that ran from 2021 through 2025 expired, and the original structure — including the hard cutoff at 400% of the federal poverty level — is back. Cross that line by a dollar and the credit does not taper; it goes to zero. A rung that costs a nominal 12% federally can carry 15, 20 or more points of lost subsidy on top.
The honest answer: for an early retiree on marketplace coverage, "convert to the top of the 12% bracket" is frequently the wrong instruction. The right rung is often much smaller — sized to hold MAGI at a subsidy-friendly level — or, in a year with an expensive plan, zero. Price the lost credit alongside the tax; the two decisions cannot be made separately. If your household sits above 400% FPL anyway, there is no credit to lose and pure bracket-filling wins again.
Ladders that run into your 60s
Past 59½ the ladder stops being about the penalty and becomes ordinary bracket management: convert while income is low, before Social Security and RMDs push it back up. Same slices, different purpose — and one new constraint. Medicare's IRMAA surcharge uses a two-year lookback, so the income on your 2026 return sets your 2028 Part B and Part D premiums. A conversion at 63 is the first that can raise a Medicare bill, and a large rung at 64 can quietly add thousands per person per year. The IRMAA calculator shows the largest conversion that stays inside your tier; the rest of the sequencing is in the withdrawals and taxes guide.
Building one, step by step
- Consolidate the pre-tax money. Roll old 401(k)s into a traditional IRA so each conversion is one instruction to one custodian. (Separated from service at 55 or later? Check the rule-of-55 exception first.)
- Count the bridge honestly. Short by a year? Shrink the rungs — do not start a ladder you cannot finish.
- Size the first rung against both constraints — bracket and ACA cliff — using that year's projected income, not last year's.
- Convert late in the calendar year. December, once income is known, buys the most information for the least cost; the clock still backdates to January 1.
- Pay the tax from outside funds, using quarterly estimates or a safe-harbor payment so a December conversion does not create an underpayment penalty.
- Keep a conversion log — year, gross amount, taxable amount — and file Form 8606 every conversion year. No custodian tracks your clocks, and a second account does not create a second set: multiple Roth IRAs are aggregated.
- Re-run the plan annually. The rung that was right in year one is rarely right in year four.
Where ladders break
- A bridge that is four years long — the most common failure, and the most expensive.
- Counting five calendar years from the transaction date. It is five tax years from January 1 of the conversion year. Erring conservatively wastes a year; erring the other way costs 10%.
- Converting into the subsidy cliff — a rung that reads 12% on the return and 30%+ once the lost premium credit is priced in.
- Forgetting conversions are permanent. Recharacterization ended in 2018.
- Emptying the traditional IRA completely. Some pre-tax balance is useful later — it fills the standard deduction at a 0% rate, absorbs large medical deductions, and is the only money eligible for qualified charitable distributions after 70½.
Built properly, the ladder is the cleanest answer early retirement has to the 59½ problem: no penalty, no rigid 72(t) schedule, no principal touched that you did not mean to touch. It asks for five years of patience up front and a rung sized with real numbers every December. Do that part with your own figures — set your balance, income, and number of rungs in the Roth conversion calculator, then take the schedule to your CPA.