What a backdoor Roth actually is

A backdoor Roth is a two-step process that lets you move money into a Roth IRA even when your income is too high to contribute directly. You put after-tax money into a traditional IRA first, then convert that money to a Roth IRA. The IRS allows this conversion regardless of your income level.

The reason people use this method is that Roth IRAs have income limits for direct contributions — if you earn above a certain threshold, you cannot put money in directly. A backdoor Roth gets around that limit. The money grows tax-free in the Roth, and you can withdraw it tax-free in retirement, which is the main benefit of a Roth account.

This is a legal strategy that the IRS recognizes. It is not a loophole or a workaround that could get you in trouble. Thousands of high-income earners use it every year. You do need to follow the steps in the right order and keep records, but the process itself is straightforward.

Key Takeaways

  • A backdoor Roth involves contributing after-tax money to a traditional IRA, then converting it to a Roth IRA to bypass income limits.
  • The conversion itself is always allowed, but you must have earned income in the year you do it, and you cannot have a large existing balance in traditional IRAs.
  • You pay taxes only on the earnings that built up between the contribution and the conversion, not on the after-tax money you put in.
  • The pro-rata rule means if you have other traditional IRA balances, some of your conversion will be taxed as if it came from pre-tax money.
  • You must complete the conversion in the same calendar year as the contribution, or the IRS treats the contribution as a regular over-limit contribution.

Why income limits exist and why people go around them

The IRS sets income limits on direct Roth contributions to keep high earners from putting unlimited tax-information programs into Roth accounts. For 2024, if you are single and earn over a certain amount, you cannot contribute to a Roth at all. If you are married filing jointly, the limit is higher but still applies.

These limits change each year based on inflation. The point is that once you cross the threshold, you lose the ability to fund a Roth directly. A backdoor Roth lets you fund one anyway, because the IRS does not restrict conversions based on income. You can convert as much as you want from a traditional IRA to a Roth, no matter how much you earn.

High earners want access to Roth accounts because the tax-free growth and tax-free withdrawals in retirement are valuable. If you expect to be in a high tax bracket in retirement, or if you want to leave money to heirs without tax consequences, a Roth is attractive. A backdoor Roth is the only way to get that benefit once your income exceeds the limit.

The two-step process: contribution and conversion

Step one: contribute after-tax money to a traditional IRA. You open or use an existing traditional IRA and put in money that you have already paid income tax on. This is not a deductible contribution — you are not reducing your taxable income this year. You are straightforward moving money into the account. You can contribute up to the annual IRA limit, which is the same whether you use a traditional or Roth IRA.

Step two: convert the traditional IRA to a Roth IRA. A few days after the contribution settles (usually one to three business days), you contact your IRA provider and request a conversion. You tell them to move the money from the traditional IRA to a Roth IRA. This is a direct transfer between accounts at the same institution, or a trustee-to-trustee transfer if you move it to a different provider. You do not touch the money yourself.

The conversion is reported to the IRS on Form 8606, which you file with your tax return. The form shows how much you converted, how much of it was after-tax money (which is not taxed again), and how much was pre-tax money or earnings (which is taxed). You will owe taxes on the taxable portion when you file your return for that year.

The pro-rata rule and why existing IRA balances matter

The pro-rata rule is the biggest complication in a backdoor Roth. It says that if you have any money in traditional IRAs — whether in the same account or spread across multiple accounts — the IRS treats all your traditional IRA money as one pool when you convert. The conversion is taxed based on the ratio of pre-tax money to after-tax money in that entire pool.

Here is an example: suppose you have a traditional IRA with $50,000 in pre-tax contributions (money you deducted when you contributed it). You also have $10,000 in after-tax contributions in the same account. That is $60,000 total, of which $50,000 is pre-tax. Now you contribute $10,000 in after-tax money to a new traditional IRA and convert it to a Roth. The pro-rata rule says 83 percent of your conversion ($50,000 out of $60,000) is treated as pre-tax money, so you owe taxes on $8,300 of the $10,000 you converted.

This rule applies even if you have old 401(k)s or SEP IRAs that you rolled into a traditional IRA years ago. If you have any pre-tax money sitting in any traditional IRA, it counts toward the pro-rata calculation. Many people do a backdoor Roth without realizing they have an old IRA balance, and then they get hit with an unexpected tax bill.

The solution is to move any pre-tax IRA money out of the traditional IRA system before you do the conversion. You can roll it into a 401(k) at your current employer (if the plan allows it), or you can leave it alone and skip the backdoor Roth that year. You cannot convert it to a Roth — that would trigger the pro-rata rule and tax you on the whole amount.

Timing: when you must complete the conversion

You must complete the conversion in the same calendar year as the contribution. If you contribute to a traditional IRA in January 2024, you must convert it to a Roth by December 31, 2024. If you do not convert by the end of the year, the IRS treats the contribution as an over-limit contribution to a Roth, which means you owe a 6 percent excise tax on the excess amount, and you have to remove it from the account.

In practice, most people convert within a few days of contributing, so timing is not usually a problem. But if you are waiting for the market to move, or if you are coordinating with a tax professional, keep the calendar year important date in mind. You cannot roll it over into the next year.

The conversion itself is reported on your tax return for the year you do it, even if the money sits in the Roth for months afterward. The tax is due when you file your return, not when you convert.

What you need before you start

You need earned income in the year you do the backdoor Roth. Earned income means wages, salary, self-employment income, or other compensation from work. You cannot do a backdoor Roth on investment income, Social Security, or retirement distributions. The amount of earned income does not have to match the amount you contribute — you just need to have some earned income that year.

You also need access to a traditional IRA and a Roth IRA. Most banks, brokerages, and investment firms let you open both. There is no cost to open an IRA, and you can open one online in a few minutes. You will need your Social Security number and basic personal information.

Finally, you need to know whether you have any existing traditional IRA balances. Check all your old employers' 401(k) plans, any SEP IRAs or straightforward IRAs you may have opened, and any traditional IRAs you opened in the past. If you have pre-tax money anywhere in the traditional IRA system, you need to deal with it before you convert.

Tax consequences and what you owe

The tax you owe depends on how much of your conversion is pre-tax money versus after-tax money. If you have no other traditional IRA balances, and you contribute $10,000 in after-tax money and convert it when ready, you owe no federal income tax on the conversion. The $10,000 was already taxed when you earned it, and it goes into the Roth tax-free.

If you have pre-tax IRA balances, the pro-rata rule applies, and you owe taxes on a portion of the conversion. The tax is calculated at your ordinary income tax rate for the year. If you are in the 24 percent tax bracket, and the pro-rata rule says 50 percent of your conversion is pre-tax money, you owe 24 percent tax on that 50 percent.

You do not owe the tax when ready. You report the conversion on Form 8606 when you file your tax return, and you pay the tax with your return. If you expect a large tax bill, you can make estimated tax payments during the year to avoid penalties.

One important note: the money you convert stays in the Roth even if you owe taxes on it. You do not have to withdraw it to pay the tax. You can pay the tax from other income or savings.

Frequently Asked Questions

Can I do a backdoor Roth if I am retired or do not have a job?

No, you need earned income in the year you do the conversion. Retirement income, investment income, and Social Security do not count. If you are retired and have no earned income, you cannot do a backdoor Roth that year. If you have a part-time job or self-employment income, that counts.

What happens if I do not convert in the same calendar year?

If you contribute to a traditional IRA but do not convert by December 31, the IRS treats it as an over-limit contribution to a Roth. You owe a 6 percent excise tax on the excess amount each year it sits there, and you have to remove it from the account. The solution is to request a return of the contribution and any earnings on it, which you can do without penalty if you do it before your tax return is due.

Do I have to convert all the money at once, or can I convert part of it?

You can convert as much or as little as you want. Some people contribute $10,000 but convert only $5,000 to a Roth and leave $5,000 in the traditional IRA. However, the pro-rata rule still applies to the entire pool of traditional IRA money, so splitting the conversion does not help you avoid taxes if you have pre-tax balances.

Can I undo a conversion if I change my mind?

You can undo a conversion by doing a recharacterization, but only if you do it before your tax return is due for that year (including extensions). A recharacterization moves the money back from the Roth to the traditional IRA and cancels the conversion. After the important date, you cannot undo it. This is useful if the market drops after you convert and you want to avoid paying taxes on a larger amount than the money is now worth.

Do I have to report a backdoor Roth to the IRS?

Yes, you report it on Form 8606, which you file with your tax return. The form shows the amount you contributed, the amount you converted, and how much of it is taxable. If you do not file Form 8606, the IRS may not know about the conversion, but you still owe the taxes, and you could face penalties and interest if you are audited.