The Roth conversion ladder, explained

Many people reach financial independence with most of their money in a traditional 401(k), 403(b) or IRA. Those accounts are great for saving. They're awkward for spending before 59½, because withdrawals generally come with a 10% additional tax on top of income tax.

The Roth conversion ladder is one of the ways early retirees work around that. It isn't a loophole: it uses rules the IRS publishes. But it takes patience, careful records and a tax plan that also thinks about health insurance.

This is general education, not advice. Roth conversions are permanent and their tax effects can be large. Please run your own numbers with a tax professional before converting.

How the ladder works

Here's the basic pattern, step by step:

1. Start in lower-income years. The ladder usually begins once you've left full-time work or your earnings have dropped, so your taxable income is lower, often a lot. Stopping work isn't a requirement for converting; it's just when the numbers tend to work best.
2. Move old workplace plans to a traditional IRA if that's what you're converting from. Some plans offer an in-plan Roth rollover into a designated Roth account inside the plan, but that money stays under the plan's own distribution rules, so it doesn't work like the IRA ladder described here (IRS). Most people building a ladder convert inside IRAs. Check first whether moving a plan would lose something useful, such as the rule of 55 or a governmental 457(b)'s freedom from the 10% additional tax; see Getting to your money before 59½.
3. Convert a slice to a Roth IRA each year, often sized to stay within a low tax bracket.
4. Pay the income tax on each conversion, ideally from cash or a taxable account.
5. Wait five tax years. Then the converted amount from that year can come out without the 10% additional tax.
6. Repeat every year, so each year a new rung becomes available.

A made-up timeline for someone who stops working in 2026 at 45:

• 2026: converts $40,000. That rung clears January 1, 2031.
• 2027: converts another $40,000. That rung clears January 1, 2032.
• 2028 onward: and so on, one rung each year.
• 2026 to 2030: lives on a taxable account, cash and any Roth IRA contributions made over the years, while the first rungs ripen.

That five-year gap is the part people underestimate. A ladder doesn't help in the first five years; you need a bridge for those years.

The rules, from the IRS

Three rules from IRS Publication 590-B make the ladder work:

• Ordering rules. Money comes out of a Roth IRA in a set order: first your regular contributions, then conversions and rollovers, oldest first, and only then earnings.
• The conversion clock. A distribution allocated to a conversion made within the five-year period beginning with the first day of the tax year of the conversion can be subject to the 10% additional tax, if you're under 59½ and no other exception applies. The period is counted separately for each conversion.
• A different five-year rule for earnings. Tax-free withdrawal of earnings requires a "qualified distribution": generally age 59½ or older, and at least five years since the first tax year you contributed to any Roth IRA. That clock is separate from the conversion clocks.

In practice, a ladder pulls out converted principal. Growth on that money generally stays put until you meet the qualified-distribution rules.

What it costs in tax

The converted amount, to the extent it hadn't been taxed before, is added to your ordinary income for the year. That's the price of admission.

The good news for early retirees is that a year with little other income can be a cheap year to convert. For 2026, the basic standard deduction is $16,100 for a single filer and $32,200 for married filing jointly (IRS Rev. Proc. 2025-32). A married couple with no other income who converted $32,200 in 2026 would, as simple arithmetic, have no federal taxable income from it. Convert more, and the excess is taxed starting in the lowest brackets. State income tax rules differ.

Details to know:

• No take-backs. Conversions made after 2017 can't be recharacterized (undone) (IRS Publication 590-A). Convert carefully, especially late in a year when your income is known.
• After-tax money in your IRAs? If you've ever made nondeductible traditional IRA contributions, part of each conversion may be non-taxable, figured across all your traditional IRAs together. The calculation is on Form 8606.
• Paying the tax. Many people pay the conversion tax from a taxable account, so the whole amount gets into the Roth. Tax withheld from the conversion itself isn't converted, and if you're under 59½ the withheld amount can be subject to income tax and the 10% additional tax (IRS Roth conversion forum transcript). Ask a tax professional how this applies to you.
• Capital gains space. Conversions are ordinary income, and ordinary income fills the tax brackets first. That can push long-term capital gains out of the 0% bracket: the IRS's Qualified Dividends and Capital Gain Tax Worksheet stacks gains on top of your other taxable income (IRS Form 1040 instructions), and the 2026 thresholds are in IRS Rev. Proc. 2025-32. Conversions and gains from a taxable account have to be planned together.

The health insurance catch

This is the part that changes the math the most for early retirees in 2026.

Marketplace coverage. Premium tax credits for marketplace plans are based on your household income, and HealthCare.gov counts most IRA and 401(k) withdrawals as income (HealthCare.gov). A taxable conversion raises the same income figure.

For 2026, the enhanced subsidies have expired, and household income generally has to be between 100% and 400% of the federal poverty level to qualify for a premium tax credit (IRS). Income above 400% means no credit at all. For 2026 coverage, Marketplace savings use the 2025 poverty guideline of $15,650 for one person in the 48 contiguous states (HealthCare.gov), so 400% is $62,600 ($15,650 × 4). And starting with 2026, there's no cap on paying back an advance credit that turns out too large (same IRS source).

So a conversion that looks tax-efficient on its own can cost thousands in lost subsidies. Many early retirees size their conversions around health insurance first and the tax bracket second. See Health insurance before Medicare.

There's also a lower boundary: income below 100% of the poverty level generally doesn't qualify for a premium tax credit either, and may point toward Medicaid depending on your state (HealthCare.gov). Some early retirees deliberately convert enough to stay above that floor.

Medicare, later. Medicare's income-related surcharge (IRMAA) generally uses your tax return from two years earlier (SSA). Large conversions at 63 or 64 can raise your Part B and Part D premiums at 65 and 66. See Medicare in plain English.

Who it fits, and who it doesn't

A ladder tends to fit people who:

• retire well before 59½ with large pre-tax balances,
• have five years of bridge money in taxable accounts, cash or Roth contributions,
• expect several years of low income, and
• are willing to keep careful records (Form 8606 and a simple spreadsheet of each year's conversion).

It may fit less well if most of your savings are already in Roth or taxable accounts, if you have a governmental 457(b) or rule-of-55 access that already solves the problem, or if your income will stay high anyway. 72(t) payments are another route to IRA money before 59½; Getting to your money before 59½ compares them.

Next step

Map which accounts pay for which years: the bridge first, then the rungs. Then check what that spending means for your number.

Work out your FIRE number →

Related: Which account do you spend first? and The HSA as a long-term account.