How a Backdoor Roth IRA Works When Your Income Is Too High

A backdoor Roth IRA is a way to put money into a Roth IRA when your income is too high to contribute directly

The IRS sets income limits on who can contribute to a Roth IRA each year. If you earn more than that limit, you cannot put money into a Roth through the normal route. A backdoor Roth IRA is a legal workaround: you contribute money to a traditional IRA (which has no income limit), then convert that money to a Roth IRA. The conversion itself has no income limit, so anyone can do it regardless of how much they earn.

The catch is that the conversion creates a tax bill in the year you do it. You pay ordinary income tax on the amount you convert, unless the money in your traditional IRA came from after-tax contributions (money you already paid tax on). The strategy only makes sense if you expect to be in a lower tax bracket now than you will be in retirement, or if you believe tax rates will rise in the future.

Key Takeaways

• A backdoor Roth works by contributing to a traditional IRA, then converting that money to a Roth IRA in the same year or shortly after.
• You owe income tax on the converted amount in the year of conversion, calculated at your ordinary tax rate for that year.
• The IRS "pro-rata rule" means if you have other traditional IRAs with pre-tax money in them, part of your conversion will be taxed even if you only converted after-tax contributions.
• You must report the conversion on Form 8606 when you file your tax return, and the IRS receives a matching report from your financial institution.
• A backdoor Roth is permanent once converted — the money grows tax-free and you can withdraw earnings penalty-free after age 59½ if the account has been open at least five years.

Why the income limit exists and when you hit it

The IRS limits who can contribute directly to a Roth IRA based on your Modified Adjusted Gross Income (MAGI). The limit changes each year and depends on your filing status. For 2024, if you are single, you cannot contribute if your MAGI is $146,000 or more. If you are married filing jointly, the limit is $230,000. These numbers shift upward slightly each year.

If your income falls between the lower and upper limit for your status, you can contribute a reduced amount. For example, a single filer with MAGI between $136,000 and $146,000 in 2024 can contribute some but not the full $7,000 annual limit. Once you cross the upper threshold, you cannot contribute at all through the front door.

The mechanics: how to execute a backdoor Roth

The process has four steps, and timing matters. First, open a traditional IRA if you do not already have one. You can do this at any brokerage or bank that offers IRAs — Vanguard, Fidelity, Charles Schwab, and most others support this. Second, contribute money to that traditional IRA. For 2024, you can contribute up to $7,000 (or $8,000 if you are 50 or older). You do not need to deduct this contribution on your tax return; in fact, you should not.

Third, wait a few days for the contribution to settle, then instruct your financial institution to convert the entire balance of that traditional IRA to a Roth IRA. You can convert to an existing Roth or open a new one at the same institution. The conversion happens electronically and usually takes one to three business days. Fourth, when you file your tax return for that year, report the contribution and conversion on Form 8606. Your financial institution will send you a Form 1099-R showing the conversion, and the IRS will receive a copy.

The pro-rata rule and why existing IRAs matter

Here is where many people run into trouble: if you have any other traditional IRAs, SEP IRAs, or straightforward IRAs with pre-tax money in them, the IRS applies the pro-rata rule to your conversion. This rule treats all your traditional IRAs as a single pool for tax purposes. If 30 percent of that pool is pre-tax money, then 30 percent of your conversion is taxable, even if you only converted after-tax money.

Example: You have a traditional IRA with $50,000 in pre-tax contributions (from a rollover or deduction years ago) and $10,000 in after-tax contributions. You contribute $7,000 after-tax to a new traditional IRA and convert it to a Roth. The IRS sees $67,000 total in traditional IRAs, of which $50,000 is pre-tax. That is 75 percent pre-tax. So 75 percent of your $7,000 conversion ($5,250) is taxable. You owe tax on $5,250 even though you only converted after-tax money.

The pro-rata rule applies across all your IRAs at the end of the calendar year, regardless of which institution holds them. If you have an old 401(k) or 403(b) from a previous job, it does not count toward the pro-rata calculation — but you can roll it into a traditional IRA, which would then trigger the rule. Some people roll old workplace plans into their current employer's plan instead to avoid this problem.

Tax consequences in the year of conversion

When you convert a traditional IRA to a Roth, you owe ordinary income tax on the pre-tax portion of the conversion in that tax year. The amount is added to your other income and taxed at your marginal rate. If you convert $7,000 and all of it is pre-tax (or subject to the pro-rata rule), you might owe $1,400 to $2,100 in federal tax, depending on your tax bracket. State income tax may explore as well, depending on where you live.

You do not have to pay this tax from the conversion itself. You can pay it from your regular income or savings. However, if you use money from the IRA to pay the tax, that withdrawal is treated as a separate transaction and may be subject to the 10 percent early withdrawal penalty if you are under 59½. The best practice is to pay the tax from outside the IRA.

When a backdoor Roth makes financial sense

A backdoor Roth is most useful if you expect your tax rate to be higher in retirement than it is now. If you are in the 24 percent tax bracket today and expect to be in the 32 percent bracket in retirement, converting at 24 percent saves you money. It is also valuable if you believe tax rates will rise in the future, since Roth withdrawals are never taxed regardless of future rate changes.

A backdoor Roth is less attractive if you are in a high tax bracket now and expect to be in a lower one in retirement. Converting at 37 percent federal tax to save money you would withdraw at 22 percent does not make sense. You should also consider whether the tax bill in the conversion year will push you into a higher bracket, trigger the net investment income tax, or reduce other tax benefits you claim (like education credits).

Reporting the conversion on your tax return

You report a backdoor Roth conversion on Form 8606, which you file with your 1040. This form has two parts: Part I records your non-deductible contribution to the traditional IRA, and Part II records the conversion. You must file Form 8606 even if you owe no tax, because it creates a record that the contribution was after-tax.

Your financial institution will send you a Form 1099-R in January showing the conversion amount and the taxable portion (if any). The IRS receives a matching copy. If you do not file Form 8606 or if the numbers do not match the 1099-R, the IRS may contact you to clarify. Mistakes here are common, so double-check the amounts before you file.

Frequently Asked Questions

Do I have to do the conversion in the same year as the contribution?

No, but it is simpler if you do. You can contribute to a traditional IRA in one year and convert it in a later year. However, the longer you wait, the more investment gains may accumulate in the traditional IRA, and those gains are taxable when you convert. Most people convert within a few days to minimize this.

What happens if I convert and then the market drops?

You still owe tax on the amount you converted, even if the value drops after the conversion. However, you can undo the conversion by requesting a "recharacterization" from your financial institution within a certain window (usually before your tax return is due). If you recharacterize, the conversion is treated as if it never happened, and you owe no tax. You can then reconvert later if the market recovers.

Can I do a backdoor Roth every year?

Yes. Many high-income earners do a backdoor Roth annually to contribute the maximum allowed amount. Each year is a separate conversion, reported separately on Form 8606. The pro-rata rule applies each year based on your total traditional IRA balance at year-end.

What if I have a 401(k) at work — does that affect the backdoor Roth?

A 401(k), 403(b), or other workplace retirement plan does not count toward the pro-rata rule. Only IRAs (traditional, SEP, and straightforward) are included. If you have an old 401(k) from a previous employer, you can leave it there or roll it to your current employer's plan to keep it separate from your IRAs.

Is a backdoor Roth legal?

Yes. The IRS acknowledges the backdoor Roth as a legal strategy in its publications and guidance. However, tax law can change, and Congress has proposed eliminating the backdoor Roth in the past. If you are considering this strategy, consult a tax professional to confirm it still makes sense for your situation.