Simple definition
A backdoor Roth is a two-step move that lets high earners fund a Roth IRA even when their income is above the direct-contribution limit. You put money into a Traditional IRA, which has no income cap, then convert that money to a Roth. It's like using a side door when the front door is locked: you reach the same room, just by a different path.
Why it matters
The Roth IRA offers tax-free growth and tax-free withdrawals in retirement, but the IRS blocks direct contributions above certain incomes. The backdoor route keeps that door open for high earners, letting their savings compound now so there's no tax bill later.
Real-life example
Say your income is above the direct-Roth cutoff. You contribute $5,000 to a Traditional IRA, then convert that $5,000 to a Roth IRA a week later. If you hold no other pretax IRA money, little or no tax is due on the conversion, and the $5,000 grows tax-free from there.
Common mistakes
- Overlooking the pro-rata rule: if you hold other pretax IRA money, part of the conversion can be taxed.
- Assuming it avoids tax entirely, when any pretax amounts you convert are taxable.
- Leaving the money in the Traditional IRA so long it earns gains that get taxed at conversion.
- Attempting it yourself in a complex situation instead of asking a tax professional.
Pro tips
- Check whether you hold any other pretax IRA balances first, since they trigger the pro-rata rule.
- Convert soon after contributing so little growth accumulates to be taxed.
- Keep records of the nondeductible contribution (Form 8606) for your taxes.
- Work with a tax professional, since the rules are easy to get wrong.
Related Money Dictionary terms
- Roth ConversionMoving money from a pre-tax retirement account into a Roth account and paying the taxes now for tax-free growth later.
- Roth IRAA retirement account funded with after-tax money that grows and comes out tax-free.
- Traditional IRAA retirement account where contributions may lower your taxable income now and you pay tax when you withdraw later.
- Contribution LimitThe maximum amount the government lets you put into a retirement account in a single year.
- Tax-Deferred GrowthInvestment gains that build up untaxed inside a retirement account until you withdraw the money later.
- Excess ContributionMoney added to a retirement account above the yearly limit, which can trigger a penalty until you remove it.
Frequently asked questions
Is the backdoor Roth legal?
Yes. It's a widely used, legal strategy that combines two allowed moves: a nondeductible Traditional IRA contribution and a Roth conversion. There's no income limit on either step. Tax rules can change, though, so confirm the current treatment with a tax professional before relying on it.
Who is the backdoor Roth for?
It's for people whose income is too high to contribute to a Roth IRA directly. Lower earners can simply contribute to a Roth the normal way and skip the extra steps. If your income sits below the IRS cutoff, you don't need the backdoor at all.
What is the pro-rata rule?
When you convert, the IRS treats all your Traditional IRA money as one pool. If some of it was never taxed, a proportional share of your conversion becomes taxable, even the part you meant to be tax-free. Existing pretax IRA balances can make the backdoor Roth costly, so plan carefully.
Knowing what Backdoor Roth means is knowledge — the first half. A brick gets placed when you act on it: check whether you hold any pretax IRA balances, then talk to a tax pro about the two-step move.
Also builds: Taxes
Sources & references
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Plain-English education — not personalized legal, tax, or investment advice.