Roth Conversion Ladder Calculator

Early retirees face a structural problem: most savings are locked in traditional IRAs and 401(k)s, where withdrawals before age 59½ trigger a 10% penalty. The Roth conversion ladder is the standard solution — but it requires 5 years of patience and the right amount of bridge funding. This calculator shows you exactly what you need.

How the Roth conversion ladder works

Under IRC §408A(d)(3), each Roth conversion starts its own 5-year holding period. After 5 years (measured from January 1 of the conversion tax year), that conversion's principal can be withdrawn without the 10% early distribution penalty — even if you're under 59½. Earnings on those converted amounts stay locked until 59½ or the penalty exception applies.

The ladder works by converting one year's worth of spending every year, starting 5 years before you'll need it:

• Convert $75,000 at age 47 → accessible penalty-free at age 52
• Convert $75,000 at age 48 → accessible at age 53
• Convert $75,000 at age 49 → accessible at age 54
• …and so on, self-sustaining from year 5 onward

The ladder "fills itself" — each year you convert the next rung while drawing from the rung that matured 5 years ago.

The bridge funding problem

The critical constraint most people miss: you need assets to live on during the 5-year fill period. If you retire at 52 and start converting at 52, your first rung isn't accessible until 57. You need 5 full years of spending covered by something else — taxable brokerage accounts, Roth contribution basis (not earnings), cash savings, rental income, or part-time work.

The smartest FIRE practitioners start converting while still working, often in lower-income years. If you can convert for 5 years before retirement, you arrive at retirement day with the first rung already mature. Bridge gap: zero.

ACA subsidy coordination — the hidden trap

Roth conversions count as ordinary income and raise your Modified Adjusted Gross Income (MAGI). This directly affects ACA marketplace premiums and subsidies:

• Premium Tax Credits under IRC §36B phase based on income relative to the Federal Poverty Level.
• Converting $75,000/year in a household spending $75,000/year may push you off the subsidy cliff entirely, adding $12,000–$24,000/year to your healthcare costs.
• The coordination: convert less in ACA-sensitive years, draw more from taxable. Convert more in years when you have higher income anyway (capital gains harvesting years, part-time work).

This is where specialist planning earns its value. The optimal conversion amount is not "annual spending" — it's a dynamic number that balances Roth conversion tax cost, ACA subsidy impact, and Roth growth compounding.

72(t) SEPP — the alternative if you haven't started the ladder

If you're already retired with no bridge funding and no ladder built, IRC §72(t)(2)(A)(iv) Substantially Equal Periodic Payments (SEPP) is the other escape hatch. You elect a fixed distribution schedule from your IRA using one of three IRS-approved methods (RMD, annuitization, or amortization). The schedule must run for 5 years or until age 59½, whichever is longer. Deviate from it and the penalty applies retroactively to all prior distributions plus interest. The ladder is more flexible; SEPP is the fallback.

One important rule: the Roth account 5-year clock

Separate from the per-conversion 5-year rule, there is a Roth account 5-year rule under IRC §408A(d)(2): the account itself must be open for 5 years before any tax-free distributions apply to earnings. This clock runs from January 1 of the year you first funded any Roth IRA. If you've never had a Roth IRA and open one at age 50 purely for conversions, the account rule starts then. Open a Roth IRA as early as possible — even a $1 contribution — to start this clock.