What happens when you convert money to a Roth

A Roth conversion means moving money from a traditional IRA or other pre-tax retirement account into a Roth IRA. You pay income tax on the amount you move in that tax year, and then the money grows tax-free inside the Roth account. You can withdraw it tax-free later, including the earnings, once you meet the withdrawal rules.

The conversion itself is straightforward mechanically: you instruct your financial institution to transfer funds from your traditional IRA to your Roth IRA. The IRS does not need permission in advance. But the tax bill arrives when you file your return, because the IRS counts the converted amount as ordinary income for that year.

Key Takeaways

  • You pay ordinary income tax on the full amount you convert in the year you convert it, calculated at your regular tax rate.
  • The conversion itself takes a few business days at most; the tax bill comes later when you file your return.
  • You can convert any amount from a traditional IRA, but converting a large sum in one year can push you into a higher tax bracket.
  • After conversion, the money sits in the Roth account and grows tax-free; you can withdraw earnings penalty-free only after age 59½ and five tax years have passed since your first Roth contribution.
  • If you have both traditional and Roth IRAs, the IRS treats all your IRAs as one account for tax purposes when you convert, which can create unexpected tax liability.

The mechanics: how the money moves

You contact your bank, brokerage, or IRA custodian and request a conversion. You specify the amount and which account it comes from (your traditional IRA) and which account it goes to (your Roth IRA). If you do not already have a Roth IRA, you open one first—this takes a few minutes online or by phone.

The institution processes the transfer, usually within three to five business days. The money lands in your Roth account and is invested according to your instructions. From the IRS's perspective, the conversion is complete the moment the money leaves the traditional account, regardless of how long the transfer takes to settle.

You do not need to file any special form with the IRS to perform the conversion. Your financial institution reports it to the IRS on Form 1099-R, which you will receive in January of the following year. You then report the conversion on your tax return when you file.

How the tax bill is calculated

The IRS taxes the converted amount as ordinary income in the year you convert. If you convert $50,000, you add $50,000 to your taxable income for that year. Your tax bill depends on your total income and your tax bracket.

If you earn $80,000 in salary and convert $50,000, your taxable income becomes $130,000. The $50,000 is taxed at whatever marginal rate applies to income above $80,000. If you are in the 24% federal bracket, you owe roughly $12,000 in federal tax on the conversion (plus state tax if your state has income tax). This is separate from any tax you already owe on your regular income.

The tax is not automatically withheld. You can ask your financial institution to withhold taxes from the conversion itself, but most people pay the tax separately when they file their return or make quarterly estimated payments. If you do not pay by April 15, you owe penalties and interest.

What happens if you have both traditional and Roth IRAs

The IRS applies what is called the pro-rata rule. If you own both a traditional IRA and a Roth IRA, the IRS treats all your IRAs as a single account for conversion purposes. This means you cannot convert only the after-tax money and leave the pre-tax money behind.

Example: You have a traditional IRA with $100,000 (all pre-tax contributions) and a Roth IRA with $20,000. You want to convert $10,000 from the traditional IRA. The IRS sees your total IRA balance as $120,000, of which $100,000 is pre-tax. That means 83% of any conversion is pre-tax money. So when you convert $10,000, $8,300 is taxable and $1,700 is not. You pay tax on $8,300, not $10,000.

This rule catches many people by surprise. If you have a large traditional IRA balance and a small amount of after-tax money you wanted to convert tax-free, the pro-rata rule prevents that. The only way to avoid it is to roll the traditional IRA into an employer retirement plan (like a 401(k)) if your plan allows it, which removes it from the pro-rata calculation.

The five-year rule for withdrawing earnings

After you convert, the money sits in your Roth account. You can withdraw the amount you converted (called the conversion contribution) at any time, tax-free and penalty-free, regardless of your age. But you cannot withdraw the earnings on that money without penalty until you meet two conditions: you must be at least 59½ years old, and at least five tax years must have passed since your first Roth contribution (not since your conversion).

The five-year clock starts on January 1 of the year you make your first Roth contribution—whether that is a regular contribution, a conversion, or a rollover. If you make your first Roth contribution in 2024, the five-year period ends on December 31, 2028. After that date, you can withdraw earnings penalty-free if you are 59½.

If you withdraw earnings before both conditions are met, you pay ordinary income tax on the earnings plus a 10% penalty. The conversion contribution itself is never penalized, only the earnings.

When a conversion makes sense financially

People convert for different reasons. Some convert in years when their income is unusually low (a job loss year, a sabbatical, early retirement before Social Security starts). Others convert gradually over several years to spread the tax bill across multiple years and avoid a single large tax hit. Some convert because they expect to be in a higher tax bracket later and want to pay tax now at a lower rate.

A conversion does not make sense if you cannot pay the tax bill from money outside the IRA. If you have to withdraw from the IRA itself to cover the taxes, you lose the tax-free growth on that money and may owe penalties. The conversion should be funded from savings, salary, or other non-retirement sources.

A conversion also does not make sense if you are in a very high tax bracket and expect to be in a lower one later. Paying 37% federal tax now to avoid 24% later is a losing trade.

What to do before you convert

Before converting, calculate your total taxable income for the year, including the conversion amount. Use a tax calculator or talk to a tax professional to see what your bracket will be and what the conversion will cost. This prevents surprises in April.

Check whether you have any traditional IRAs, SEP IRAs, or SIMPLE IRAs. The pro-rata rule applies to all of them. If you do, calculate how much of your conversion will be taxable using the pro-rata formula.

Decide where the tax money will come from. If you have to pull it from the IRA, reconsider the conversion. If you have savings or income to cover it, proceed.

If you are close to Medicare age or receive means-tested benefits (like Medicaid or subsidized health insurance), check whether the conversion will affect your premiums or benefits. A large conversion can increase your income enough to change what you pay for healthcare.

Frequently Asked Questions

Can I undo a conversion if I change my mind?

You can undo 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. After that deadline, the conversion is permanent. If you converted in 2024, you have until April 15, 2025 to undo it.

Do I have to convert my entire traditional IRA?

No. You can convert any amount, from a few hundred dollars to the entire balance. You can also convert part of one IRA and leave the rest untouched. However, the pro-rata rule still applies to the entire amount you convert, based on your total IRA balance across all accounts.

What if I convert and then my income drops later in the year?

You are still taxed on the conversion at your year-end income level. If you convert early in the year and then lose your job, you cannot reduce the conversion tax retroactively. This is why some people wait until late in the year to convert, after they know what their full-year income will be.

Can I convert a 401(k) to a Roth?

You can convert a 401(k) to a Roth IRA, but only if you are no longer employed by the company that sponsors the plan. If you still work there, most plans do not allow in-service conversions. After you leave, you can roll the 401(k) into a traditional IRA and then convert to a Roth, or convert directly to a Roth if your plan allows it.

Does a conversion affect my Social Security benefits?

A conversion increases your income for that year, which can affect how much of your Social Security is taxable if you claim before full retirement age. It does not reduce your benefit amount, but it may increase your tax bill. If you are close to claiming Social Security, check with a tax professional before converting.