Roth Conversion Calculator

Q: How is a Roth conversion taxed?

The converted amount is added to your taxable income for the year and taxed at your ordinary federal income tax rates — there's no separate 'conversion tax rate.' It's simply treated as additional income on top of whatever else you earn that year.

Q: Can a Roth conversion push me into a higher tax bracket?

Yes. Because the converted amount stacks on top of your existing income, a large enough conversion can push part of it — or all of it — into a higher marginal bracket than your regular income alone would reach.

Q: Is there a penalty for converting to a Roth?

No early withdrawal penalty applies to the conversion itself, regardless of age. However, if you withdraw the converted funds within 5 years of the conversion and you're under 59½, a 10% penalty can apply to that withdrawal under the 'five-year rule.'

Q: Why would someone convert to a Roth and pay tax now?

To get tax-free growth and withdrawals in retirement, and to avoid required minimum distributions that traditional accounts have. It tends to make the most sense when you expect to be in a higher tax bracket in retirement than you are now, or want to reduce future RMDs.

See exactly how much extra federal tax a Roth conversion costs, and whether it pushes part of your income into a higher bracket.

Written by the Calculator Index team · Source: IRS ordinary income tax treatment of Roth conversions; 2025 federal brackets · Last reviewed September 2026

Extra federal tax from the conversion

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Federal tax without conversion

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Federal tax with conversion

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Effective rate on the converted amount

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How Roth conversion tax is calculated

Extra tax = Federal tax on (Other income + Conversion amount) − Federal tax on (Other income alone)

A Roth conversion is taxed by simply adding the converted amount to your other taxable income for the year, then applying the regular federal bracket schedule to the combined total. The "cost" of the conversion is the difference between what you'd owe with it and without it — which is usually a blend of your current marginal rate and possibly a higher rate if the conversion is large enough to spill into the next bracket.

Worked example — $61,000 other income, $30,000 conversion, single

Federal tax on $61,000 alone: $8,334. Federal tax on $91,000 ($61,000 + $30,000 conversion): $14,934.

Extra tax from the conversion: $6,600 — an effective rate of 22% on the converted amount, since the entire $30,000 falls within the 22% bracket in this example.

Why the effective rate on a conversion can be higher than your current bracket

If your other income is near the top of one bracket, converting a large enough amount pushes part of the conversion into the next higher bracket — meaning the effective rate on the conversion itself can exceed your regular marginal rate. This is why converting in smaller pieces across multiple years, staying within a target bracket each year, is a common strategy for people doing large multi-year conversions.

Common mistakes when estimating Roth conversion cost

Assuming a flat rate applies to the whole conversion. If the conversion spans two brackets, part of it is taxed at each rate.
Forgetting state income tax. This calculator covers federal tax only — most states with an income tax will also tax the conversion as ordinary income.
Ignoring the 5-year rule on withdrawing converted funds. Withdrawing converted amounts within 5 years while under 59½ can trigger a 10% penalty even though the conversion itself wasn't penalized.

Frequently asked questions

How is a Roth conversion taxed?

The converted amount is added to your taxable income and taxed at ordinary federal rates — no separate conversion tax rate exists.

Can a Roth conversion push me into a higher tax bracket?

Yes — a large enough conversion can push part of your income into a higher marginal bracket.

Is there a penalty for converting to a Roth?

No penalty on the conversion itself, but withdrawing converted funds within 5 years while under 59½ can trigger a 10% penalty.

Why would someone convert to a Roth and pay tax now?

To get tax-free future growth and withdrawals, and reduce future required minimum distributions — especially useful if you expect a higher tax bracket in retirement.

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Note: Simplified estimate using 2025 federal brackets; excludes state income tax, the standard deduction (assumed already applied to "other income"), and other credits. Not tax advice. Last reviewed: September 2026.