How a Backdoor Roth IRA Works for High Earners

You got a raise, filed your taxes, and found out your income is now too high to contribute to a Roth IRA directly. The tax-free growth you were counting on seems to be off the table. It is not. A backdoor Roth IRA is a two-step move, fully legal and openly acknowledged by Congress, that lets high earners put money into a Roth anyway.

The steps are simple. The mistakes are where people get hurt, usually through one rule most explanations skip. Here is how the backdoor Roth IRA works, what it costs, and who should not do it at all.

Why high earners get locked out of a Roth

Direct Roth IRA contributions phase out as income rises. For 2026, the phase-out range for single filers is a modified adjusted gross income of $153,000 to $168,000. For married couples filing jointly it is $242,000 to $252,000. Above the top of the range, you cannot contribute directly at all.

Traditional IRAs have no income limit for contributions. What income changes is the deduction. And since 2010, there has been no income limit on converting a traditional IRA to a Roth. Put those two facts together and you have the backdoor.

If you are still deciding whether a Roth is worth the effort, our explainer on what a Roth IRA actually does for your future covers the long-term math.

How a backdoor Roth IRA works, step by step

1. Open a traditional IRA and a Roth IRA at the same brokerage. Most major firms let you do both online in about 15 minutes.
2. Make a nondeductible contribution to the traditional IRA. For 2026 the limit is $7,500, or $8,600 if you are 50 or older. You put in after-tax money and do not take a deduction.
3. Leave it in cash or a money market fund. Do not invest it yet. Any gains before conversion become taxable.
4. Convert the full balance to the Roth IRA. Most brokerages have a "convert" button. If the money earned a few dollars of interest, convert that too and expect to owe a tiny amount of tax on it.
5. Invest inside the Roth. Now the money can go into index funds or whatever your plan calls for.
6. File IRS Form 8606 with your tax return. This form records the nondeductible contribution and shows the conversion was mostly tax-free.

Done cleanly, the whole process costs nothing in tax beyond a few cents or dollars of interest. Each year you repeat it.

The pro-rata rule that trips people up

This is the part that turns a tax-free move into a surprise bill. When you convert, the IRS does not let you pick which IRA dollars you are converting. It looks at all of your traditional, SEP, and SIMPLE IRA balances combined as of December 31 of the conversion year.

Say you have $67,500 sitting in an old rollover IRA from a past job, all pre-tax. You add $7,500 of nondeductible money and convert $7,500. Your total IRA balance is $75,000, and only 10 percent of it is after-tax. So only 10 percent of the conversion is tax-free. The other $6,750 is taxed as ordinary income. At a 32 percent bracket, that is about $2,160 you did not plan on.

How to clear the way

The usual fix is to roll your pre-tax IRA money into your current employer's 401(k), if the plan accepts incoming rollovers. 401(k) balances do not count in the pro-rata calculation. Call the plan administrator and ask before you start. Our guide to rolling over an old 401(k) explains how the paperwork moves between accounts.

The "wait a month before converting" advice is outdated

For years, the standard warning was to let the contribution sit for 30 days, or even a full year, before converting. The worry was the step transaction doctrine, the idea that the IRS might treat two quick steps as one forbidden direct contribution.

I think that advice now costs more than it protects. The conference report for the 2017 tax law described the backdoor approach as permissible, and the IRS has not challenged it in the years since. Waiting a month does create a real cost: the money may earn interest or market gains, and those gains become taxable on conversion. It also adds another task you might forget.

Most planners now convert within a few days, once the contribution has settled. If your situation is unusual, such as a large mix of after-tax and pre-tax money, talk to a tax professional. For a clean account, waiting just adds friction.

Who should skip the backdoor Roth IRA

This strategy is not right for everyone with a high income. Skip it, or pause, if:

• You have a large pre-tax IRA balance and your 401(k) will not accept a rollover.
• You have not maxed out a 401(k) match yet. A match is an instant 50 or 100 percent return and comes first.
• You do not have an emergency fund. Roth contributions can be withdrawn, but converted amounts face a five-year rule for penalty-free withdrawal before 59 and a half.
• You expect to be in a much lower bracket in retirement and would rather take deductions now through other accounts.

A married couple can each do a backdoor, and a non-working spouse can too, using the same rules covered in our article on how a spousal IRA works. That doubles the yearly amount to $15,000 for a couple under 50.

Common filing mistakes

Most backdoor problems show up at tax time, not at the brokerage. Watch for these:

• Forgetting Form 8606. Without it, the IRS may treat the whole conversion as taxable. The penalty for not filing is $50, but the bigger risk is paying tax twice.
• Entering the 1099-R wrong. Tax software asks whether the distribution was converted and if you made nondeductible contributions. Answering out of order is a common way to get a wrong result.
• Contributing for the wrong year. You can make a prior-year contribution until the April filing deadline. Label it correctly with the brokerage.

Frequently asked questions

Is a backdoor Roth IRA legal?

Yes. Contributing to a traditional IRA and converting it to a Roth are both allowed regardless of income. Congress acknowledged the strategy in 2017, and it remains widely used. Proposals to end it have come up, but none have passed so far.

Can I do a backdoor Roth IRA every year?

Yes. You can repeat the process each tax year up to the annual IRA limit. Many people make the contribution in January and convert a few days later so the money starts growing tax-free as early as possible.

Do I pay taxes on a backdoor Roth conversion?

Only on the portion that was never taxed. If you have no other pre-tax IRA money and convert quickly, the tax is usually zero or a few dollars on interest. If you have existing pre-tax IRA balances, the pro-rata rule can make a large share taxable.