A Roth IRA lets you invest after-tax dollars and never pay taxes on the growth or withdrawals in retirement. But if your income is too high, the IRS does not allow you to contribute directly. The backdoor Roth IRA is a legal workaround that lets high earners access the Roth IRA’s benefits anyway.
Who Needs a Backdoor Roth IRA?
Direct Roth IRA contributions phase out at higher incomes. For 2026, the income limits are:
- Single filers: Phase-out begins at $150,000. Completely phased out at $165,000.
- Married filing jointly: Phase-out begins at $236,000. Completely phased out at $246,000.
If your income is above these thresholds, you cannot contribute directly to a Roth IRA. The backdoor Roth IRA solves this.
How the Backdoor Roth IRA Works
The process has two steps:
- Make a non-deductible traditional IRA contribution. There is no income limit for contributing to a traditional IRA — you just cannot deduct the contribution from your taxes if your income is above certain thresholds. The 2026 contribution limit is $7,000 ($8,000 if you are 50 or older).
- Convert the traditional IRA to a Roth IRA. This is called a Roth conversion. You move the money from your traditional IRA to your Roth IRA. Because you already paid taxes on that contribution (it was non-deductible), you owe little or no additional tax on the conversion — only on any earnings the money made between the contribution and the conversion.
To minimize taxes, convert as soon as possible after making the contribution — ideally within a few days, before the money has time to earn interest or gains.
The Pro-Rata Rule: The Critical Catch
The backdoor Roth IRA works cleanly if your only traditional IRA is the one you just contributed to. But if you already have other traditional IRA money (from prior contributions or a rollover from an old 401(k)), the pro-rata rule applies.
The pro-rata rule means the IRS treats all your traditional IRA money as one pool. If $6,000 of that pool is after-tax (your new non-deductible contribution) and $54,000 is pre-tax (old rollover), then 10% of your conversion is tax-free and 90% is taxable — not the clean, tax-free conversion you wanted.
To avoid the pro-rata problem, either:
- Roll your pre-tax traditional IRA money into your current employer’s 401(k) before doing the backdoor Roth (many plans accept rollovers in)
- Or do the backdoor Roth before you have any pre-tax IRA money
Step-by-Step: How to Do a Backdoor Roth IRA in 2026
- Open a traditional IRA at a brokerage like Fidelity, Schwab, or Vanguard if you do not already have one.
- Make a non-deductible contribution of up to $7,000 ($8,000 if 50+). Do not invest the money yet — leave it as cash.
- Wait a few days for the contribution to settle.
- Convert the traditional IRA to a Roth IRA. Your brokerage will have a conversion option — it takes a few clicks online.
- Invest the money in your Roth IRA in your chosen funds.
- File Form 8606 with your tax return to report the non-deductible contribution and conversion. This is how you prove to the IRS that you already paid taxes on this money.
Mega Backdoor Roth: For 401(k) Plans
Some employer 401(k) plans allow an additional strategy called the mega backdoor Roth. If your plan allows after-tax contributions and in-service Roth conversions, you can contribute up to $46,000 in after-tax 401(k) dollars (beyond the normal $23,500 employee limit in 2026) and then convert those dollars to a Roth account. Not all 401(k) plans allow this — check your plan documents or ask your HR department.
Is the Backdoor Roth IRA Legal?
Yes. The strategy has been widely used for years and has been explicitly addressed by the IRS. As of 2026, it remains a fully legal tax strategy. There have been legislative proposals to eliminate it in the past, but no such changes have been enacted.
Bottom Line
If your income exceeds the Roth IRA limits, the backdoor Roth IRA is a powerful tool to keep your retirement savings growing tax-free. The process takes about 30 minutes to execute and one additional tax form each year. Just watch out for the pro-rata rule if you have pre-tax IRA money — and consider talking to a tax professional before your first conversion.