Building a Roth Conversion Ladder

01 The problem the ladder solves

Retire at 52 with a 401(k) and almost nothing taxable, and the money is there but not reachable. A withdrawal before 59½ generally carries a 10% additional tax on top of ordinary income tax, which is a heavy price to pay every year for eight years.

The alternatives are limited. A 72(t) schedule works but fixes the withdrawal amount for years and breaks expensively. The separation-from-service exception only helps from 55, and only for the plan you left.

The ladder is the flexible answer. It converts money you already own from one tax status to another, on a schedule you control, and nothing is locked once a rung matures.

Source: Publication 590-A

02 How each rung works

In year one, convert roughly one year of spending from a traditional IRA to a Roth IRA. That amount is ordinary income for that tax year and the tax is paid from taxable savings, not from the conversion.

Five years later, that converted amount can be withdrawn from the Roth free of the 10% early distribution penalty, whatever your age. Repeat the conversion each year and, from year six onward, a matured rung is available every year.

The Roth ordering rules make this work: withdrawals come out as contributions first, then conversions in the order they were made, then earnings. Because you only ever draw matured conversions, earnings are never touched and the second five-year rule — the one governing tax-free earnings — never comes into play.

Source: Publication 590-B

03 Filling the first five years

Nothing comes out of the ladder for five years, so those years have to be funded from somewhere else. In practice that is taxable brokerage savings, cash, Roth contributions already made, or a governmental 457(b), which has no early withdrawal penalty at all.

This is the constraint that decides whether the ladder is available. A household with five years of spending outside tax-deferred accounts can start immediately. One without has to build that first, or use a 72(t) schedule to cover the gap while the ladder matures behind it.

Roth contributions — as opposed to conversions — can be withdrawn at any time without tax or penalty, which makes an existing Roth a useful part of the bridge. Records of what was contributed versus converted matter here more than anywhere else.

Source: Publication 590-B

04 Getting the money into the IRA first

Conversions run from a traditional IRA, so an employer plan usually has to be rolled over first. That rollover is not itself taxable if done directly, and it is the step to complete in the year you leave work.

One trap sits here. If you have any pre-tax IRA balance, conversions are taxed pro rata across all traditional IRA money, which matters if you also hold non-deductible basis. The same aggregation rule that complicates a backdoor Roth applies to every conversion in the ladder.

The other consideration is what not to roll. A governmental 457(b) loses its penalty exception when rolled to an IRA, and that exception is more valuable than the conversion flexibility for exactly the person building a ladder.

Source: Rollovers of retirement plan and IRA distributions

05 Sizing each rung

The rung size is the year's spending, less whatever comes from taxable sources. Converting more than that pushes income into a higher bracket for no benefit; converting less leaves a shortfall in five years' time.

The competing claim on the same low-income years is ordinary Roth conversion for its own sake — reducing future required distributions rather than funding spending. Where both matter, the ladder rung comes first because it has a deadline, and additional conversion happens with whatever bracket space is left.

Two thresholds constrain how much space there really is. ACA premium tax credits fall as income rises, and for a household buying its own health insurance before Medicare, that can cost more than the income tax saved. The conversion plan and the health insurance plan have to be built together.

Source: FAQs on designated Roth accounts

06 Keeping the records the ladder depends on

A ladder is a claim about dates. When you withdraw a matured conversion at 56, the position you are taking is that this particular amount was converted more than five years earlier — and the burden of showing that sits with you, not with the custodian.

Custodians report a conversion in the year it happens and report a distribution in the year it happens, but nothing in their reporting connects the two. Brokers change, accounts get consolidated, and a statement from eight years ago is not always retrievable. Keep a single running record of every conversion: the date, the amount, and the taxable portion.

Form 8606 is where non-deductible basis is tracked, and it matters here because a conversion that included basis is not fully taxable. Filing it every year the ladder runs, even in years the arithmetic seems trivial, is what keeps that basis from being taxed a second time later. The same discipline that makes a backdoor Roth defensible makes a ladder defensible.

The practical habit is a one-page sheet updated each December, kept with the tax return rather than with the brokerage statements. It costs ten minutes a year and it is the only thing standing between a penalty-free withdrawal and an argument you cannot win.

Source: Publication 590-A