What Is a Backdoor Roth IRA and Who Should Consider One?
Sam's List Editorial | 2026-07-17
What Is a Backdoor Roth IRA and Who Should Consider One? A backdoor Roth IRA is a legal, two-step way for high earners to put money into a Roth IRA even though their income is too high to contribute directly. You make a nondeductible contribution to a traditional IRA, then convert that money to a Roth. The result is Roth money for someone the front door would have turned away. It sounds like a loophole, and in a sense it is, but it is a well-established one that the IRS has acknowledged. The catch is that the mechanics have a trap in them, the pro-rata rule, that can turn a simple move into an unexpected tax bill if you have the wrong setup. Here is how the strategy works and who it actually fits. Why the Backdoor Exists Roth IRAs have income limits. Above a certain modified adjusted gross income, which adjusts each year, you are not allowed to contribute to a Roth directly. Traditional IRAs, by contrast, have no income limit on contributions, only on whether those contributions are tax-deductible. That mismatch is the whole basis for the strategy. A high earner can always contribute to a traditional IRA on a nondeductible basis, and there is no income limit on converting a traditional IRA to a Roth. Put those two facts together and you have the backdoor: contribute where you are allowed, then convert to where you wanted to be. How a Backdoor Roth Works, Step by Step The strategy has a simple shape. First, contribute to a traditional IRA up to the annual limit, and because your income is high, treat the contribution as nondeductible. Second, convert that traditional IRA balance to a Roth IRA, usually soon after. Because you already paid tax on the contributed money (you took no deduction), converting it should trigger little or no additional tax, apart from any earnings that accrued before you converted. From then on, the money grows tax-free in the Roth and qualified withdrawals in retirement are tax-free. The appeal is real: Roth growth and tax-free retirement income for someone otherwise shut out. The limitation is that this only stays clean if your IRA situation is simple. When it is not, the pro-rata rule enters the picture. The Pro-Rata Rule Trap This is the part that catches people. When you convert, the IRS does not let you cherry-pick only your after-tax dollars. It looks at all your traditional, SEP, and SIMPLE IRA balances together and treats your conversion as coming proportionally from pre-tax and after-tax money across all of them. So if you have a large pre-tax IRA, from an old 401(k) rollover, say, most of your "backdoor" conversion...
