Roth IRA Conversion Basics

A Roth IRA conversion moves money from a traditional IRA (or another pre-tax retirement account, such as a traditional 401(k) rolled into an IRA) into a Roth IRA. The amount converted is treated as ordinary income in the year of the conversion, but once the money is inside the Roth account it grows tax-free and, after the account meets the five-year and age-59-and-a-half rules, comes out tax-free as well.

Why Convert?

The core trade-off is paying tax now instead of later. A conversion tends to make the most sense when:

• You expect to be in a higher tax bracket in retirement than you are today — for example, early-career savers or anyone with an unusually low-income year.
• You want to reduce future required minimum distributions (RMDs), since Roth IRAs are not subject to RMDs during the original owner's lifetime.
• You want to leave tax-free assets to heirs, who otherwise inherit a traditional IRA's deferred tax liability along with the account.

How the Tax Bill Is Calculated

The converted amount is added to your other taxable income for the year, which can push you into a higher marginal bracket if the conversion is large. A common strategy is a partial conversion: converting only enough each year to "fill up" a target tax bracket, spreading a large traditional IRA balance across several years instead of converting it all at once.

If you have ever made non-deductible (after-tax) contributions to a traditional IRA, part of the conversion may already be tax-free — but only in proportion to your total pre-tax and after-tax IRA balances across every traditional IRA you own, not just the account being converted. This "pro-rata rule" trips up many savers attempting a so-called backdoor Roth contribution, since the IRS treats all of your traditional IRAs as one combined pool for this calculation.

The Five-Year Rule

Each Roth conversion starts its own five-year clock for penalty-free withdrawal of the converted principal if you are under age 59½. Withdrawing converted funds before that clock runs out can trigger a 10% early-withdrawal penalty on the converted amount, even though it is not taxed again as income. This is separate from the five-year rule that applies to Roth earnings.

Practical Steps

1. Estimate your current-year taxable income and identify how much room remains before the next tax bracket.
2. Decide whether to pay the conversion tax from outside the IRA (generally preferable) or by withholding from the converted funds themselves (which reduces the amount actually invested).
3. Complete the conversion directly between custodians (a trustee-to-trustee transfer) to avoid the 60-day rollover rules and mandatory withholding that can apply to an indirect rollover.
4. Track each conversion's date and amount separately, since each one has its own five-year clock.

Roth conversions are irreversible — the IRS eliminated the ability to "recharacterize" a conversion back to a traditional IRA starting with tax year 2018 — so the decision deserves careful modeling of your current and expected future tax brackets before you act.

Sample content for demonstration purposes — not financial advice.