Yes, Roth conversions are taxable in the year you move money from a traditional IRA to a Roth IRA

When you convert funds from a traditional IRA to a Roth IRA, the IRS treats the money you move as income on your tax return for that year. You owe federal income tax on the full amount converted, calculated at your ordinary income tax rate. This is true even though you are moving money between accounts you already own — the conversion itself is a taxable event.

The tax bill arrives in the year you do the conversion, not later. If you convert $50,000 in January 2024, you report that $50,000 as income on your 2024 tax return, filed in 2025. You do not defer the tax or pay it over time; it is due when you file.

The amount you owe depends on your total income that year and your tax bracket. A $50,000 conversion might cost you $10,000 to $20,000 in federal tax, depending on your other income and whether you are single or married. State income tax may apply on top of that in most states.

Key Takeaways

  • The full amount you convert counts as ordinary income in the year you convert, taxed at your regular income tax rate.
  • You owe the tax bill in the year of conversion, not in future years when you withdraw the money from the Roth.
  • If you have a traditional IRA with pre-tax contributions and a SEP-IRA or SIMPLE IRA, the pro-rata rule may increase your tax bill beyond the amount you convert.
  • You can pay the tax from outside the IRA (recommended) or from the IRA itself, but paying from the IRA counts as an additional withdrawal and may trigger penalties.
  • The tax you owe is separate from any early withdrawal penalty; you may face both if you are under 59½ and do not meet an exception.

How the tax is calculated when you have multiple IRAs

If you have only one traditional IRA and no other IRAs, the calculation is straightforward: convert $50,000, report $50,000 as income. But if you have a mix of pre-tax and after-tax money across multiple IRAs, the pro-rata rule changes what you owe.

The pro-rata rule says you cannot convert only the after-tax portion of your IRAs and leave the pre-tax portion behind. Instead, the IRS treats all your IRAs as one pool. If 80 percent of your total IRA balance is pre-tax money and 20 percent is after-tax, then 80 percent of any conversion is taxable and 20 percent is not.

Example: You have $100,000 in a traditional IRA (all pre-tax) and $50,000 in a SEP-IRA (all pre-tax). You also have $10,000 in a Roth IRA (already after-tax, not counted). Your total pre-tax IRA balance is $150,000. If you convert $30,000 from the traditional IRA, all $30,000 is taxable because 100 percent of your IRA pool is pre-tax money. You cannot avoid the tax by converting only a portion.

If instead you had $100,000 pre-tax in a traditional IRA and $50,000 after-tax in a traditional IRA (basis), and you convert $30,000, then $20,000 of the conversion is taxable (because two-thirds of your pool is pre-tax) and $10,000 is not (because one-third is after-tax basis).

Paying the tax from your IRA versus paying from outside funds

You have two ways to pay the tax bill: use money from outside the IRA, or use money from the IRA itself. The IRS does not care which you choose, but the consequences are very different.

Paying from outside funds is the standard approach. You convert $50,000 to the Roth, owe $12,000 in tax, and pay that $12,000 from your checking account or other savings. The full $50,000 stays in the Roth and grows tax-free. This is the cleanest path.

Paying from the IRA itself means you tell the financial institution to withhold tax from the conversion. If you convert $50,000 and ask them to withhold $12,000 for tax, only $38,000 goes into the Roth. The $12,000 withheld is treated as a withdrawal from your IRA, not as payment of your tax bill. You still owe the full $12,000 in tax when you file, and you have lost $12,000 of retirement savings. This approach is rarely worth it unless you have no other way to pay.

If you are under 59½, paying from the IRA also exposes the withheld amount to the 10 percent early withdrawal penalty, on top of income tax. A $12,000 withhold could cost you an extra $1,200 in penalty.

Whether you owe an early withdrawal penalty on top of income tax

The income tax on a conversion is separate from the early withdrawal penalty. You may owe both, or neither, depending on your age and circumstances.

If you are 59½ or older, you owe only the income tax on the conversion. No penalty applies.

If you are under 59½, you normally owe both the income tax and a 10 percent penalty on the amount converted. A $50,000 conversion at age 45 costs you $50,000 in taxable income plus $5,000 in penalty (10 percent of $50,000), on top of the income tax itself.

However, Roth conversions are exempt from the early withdrawal penalty — but only if you follow the rules. You can convert at any age without penalty. The penalty applies only if you withdraw the converted money from the Roth before age 59½ and before five years have passed since the conversion. The five-year rule is per conversion, not per account: a 2024 conversion can be withdrawn penalty-free starting in 2029, even if you did a 2020 conversion that is already past five years.

The income tax still applies at any age. The penalty is what you avoid by converting instead of withdrawing.

State income tax on conversions

Most states tax Roth conversions as ordinary income in the year of conversion, just as the federal government does. The state tax rate varies by state and by your income level, typically ranging from 3 to 13 percent of the conversion amount.

A handful of states do not tax retirement income at all — including Florida, Texas, Wyoming, and South Dakota — and do not tax conversions either. If you live in one of these states, you owe only federal tax on the conversion.

A few states have special rules. Illinois does not tax IRA withdrawals or conversions for residents, even though it taxes other income. New Hampshire taxes only interest and dividends, not IRA conversions. Check your state's tax authority website or speak with a tax professional in your state to learn the exact rule where you live.

How to report the conversion on your tax return

You report a Roth conversion on IRS Form 8606, "Nondeductible IRAs." This form tracks the taxable and nontaxable portions of the conversion and calculates how much income to report.

Your financial institution will send you Form 1099-R in January of the year after the conversion, showing the amount converted. You use this form and Form 8606 together when you file your tax return.

If you have a mix of pre-tax and after-tax money in your IRAs, Form 8606 also calculates the pro-rata portion. You cannot simply report the after-tax portion as nontaxable; the form enforces the pro-rata rule.

Most tax software will walk you through Form 8606 if you enter the conversion details. If you file by hand or work with a tax preparer, give them the 1099-R and tell them the date and amount of the conversion, and whether any of the conversion was after-tax basis.

Timing conversions to manage your tax bill

Because the tax is due in the year of conversion, the timing of when you convert affects how much tax you owe. Converting in a low-income year costs less than converting in a high-income year.

If you are retired and have little other income, converting in your first year of retirement may be cheaper than converting while still working. If you expect a bonus or large capital gain in December, converting in November might save you money by keeping you in a lower bracket.

Some people convert in tranches over multiple years to spread the tax bill across years and avoid jumping into a higher bracket. Converting $20,000 per year for five years may cost less in total tax than converting $100,000 in one year, depending on your other income and tax brackets.

There is no rule against multiple conversions in one year or across years. You can convert as much or as little as you want, whenever you want. The trade-off is always the same: more conversion now means more tax now, but more tax-free growth later.

Frequently Asked Questions

Can I undo a Roth conversion if I change my mind about the tax bill?

You can reverse a conversion through a process called a recharacterization, but only within certain time limits. You must recharacterize by the tax filing deadline (usually April 15) of the year after the conversion. If you converted in 2024, you can recharacterize by April 15, 2025. The money goes back to a traditional IRA, and the conversion is treated as if it never happened for tax purposes.

Do I have to convert my entire traditional IRA, or can I convert just part of it?

You can convert any amount, from a few hundred dollars to the entire balance. There is no minimum or maximum. However, if you have multiple IRAs, the pro-rata rule applies to all of them together, not to each one separately. You cannot convert only the after-tax portion of one IRA and avoid the rule.

What happens if I convert but cannot afford to pay the tax bill?

You still owe the tax when you file your return. If you cannot pay in full, you can set up a payment plan with the IRS, but interest and penalties will accrue. Some people pay the tax from the converted Roth itself, but this reduces the amount growing tax-free and may trigger penalties if you are under 59½. It is better to plan the conversion amount based on what you can afford to pay from outside funds.

Does a Roth conversion count as income for Medicare premiums or other benefits?

Yes. The conversion amount is added to your income for the year, which can increase your Medicare premiums (IRMAA) and may affect other income-based benefits like tax credits or Medicaid. The impact depends on your total income that year and the specific benefit. Consult a tax professional or benefits counselor before converting if you receive income-based benefits.

Can I convert a Roth IRA back to a traditional IRA?

No. Recharacterization (reversing a conversion) only works in one direction: Roth back to traditional. Once money is in a Roth and the recharacterization window has closed, it stays in the Roth. You cannot move it back to a traditional IRA to undo the tax.