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Roth conversion

Moving money from a traditional IRA or 401(k) to a Roth, paying tax now so future growth and withdrawals are tax-free.

What is Roth conversion?

Moving money from a traditional IRA or 401(k) to a Roth, paying tax now so future growth and withdrawals are tax-free.

Why it matters on your return

Conversions are a marginal-rate arbitrage: convert in low-income years, retire in high-income ones. They also stack on top of other income, so a conversion in a big crypto year is usually the wrong year.

Example

A retiree with $30,000 of income converts $40,000, filling the lower brackets at 12 and 22 percent, rather than converting in a year with a large capital gain.

Can I undo a conversion?

No. Recharacterization of conversions ended in 2018. The decision is final once made.

Last reviewed September 15, 2026. Tax rules change; confirm current law before acting.

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