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High earners are locked out of contributing to a Roth IRA directly once their income clears the IRS phase-out range. The backdoor Roth is a two-step, entirely legal workaround: contribute to a traditional IRA with no income limit on the contribution itself, then convert it to a Roth. The mechanics are simple; the pitfall, the pro-rata rule, is not.
Step One: A Non-Deductible Traditional IRA Contribution
Anyone with earned income can contribute to a traditional IRA regardless of income level; the 2026 limit is $7,500 under age 50, or $8,600 at 50 and older. If your income is too high to deduct the contribution, you make it anyway and report it as non-deductible on Form 8606. This step has no income restriction, unlike a direct Roth contribution.
Step Two: Convert to Roth
Shortly after the contribution, you convert the traditional IRA balance to a Roth IRA. Converting quickly, before the money has time to earn significant investment gains, minimizes the taxable amount of the conversion, since only the growth (not the original non-deductible contribution) is taxed.
The Pro-Rata Rule Can Wreck This
The backdoor Roth only works cleanly if you have no other pre-tax money sitting in traditional, SEP, or SIMPLE IRAs. The IRS aggregates the balances of all your traditional, SEP, and SIMPLE IRAs as of December 31 of the conversion year and applies the pro-rata rule: your conversion is treated as a proportional mix of pre-tax and after-tax dollars across that entire combined balance, not just the account you just converted. If you have a large pre-tax IRA balance from an old rollover, a big chunk of your “backdoor” conversion becomes taxable. Workplace plans like a 401(k) or 403(b) are not included in this calculation, which is why rolling old IRA balances into a current employer’s 401(k) before converting is a common way to clear the pro-rata problem.
2026 Roth IRA Direct Contribution Income Limits, for Context
The backdoor route matters because direct Roth contributions phase out for single filers between $153,000 and $168,000 of income, and for married couples filing jointly between $242,000 and $252,000. Above those ranges, the backdoor conversion is the only way into a Roth IRA, since conversions themselves have no income limit at all.
How This Connects to Your Other Retirement Accounts
A backdoor Roth works alongside, not instead of, maxing out your 401(k) contributions for the year. If you also have access to an HSA, the triple tax advantage there is worth maxing before layering on backdoor Roth conversions, since the HSA’s tax treatment is strictly better across all three stages of the money’s life.
Source: IRS Notice 2025-67, 2026 retirement plan contribution and income limits.
Bottom Line
The backdoor Roth is a legitimate, IRS-acknowledged strategy, not a loophole in the sense of something that might get closed retroactively on you. The real risk is not the strategy itself but forgetting about an old pre-tax IRA balance sitting somewhere and triggering an unexpected tax bill through the pro-rata rule.
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