Retirement Accounts
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Backdoor Roth: A Strategy for High Earners
A married couple filing jointly with a household income around $240,000 typically finds the normal Roth IRA contribution door closed, because the income limit sits well below that. Yet many higher earners still build tax-free Roth balances through a two-step move known as the backdoor Roth. In a typical year, this path lets someone above the normal cap quietly shift several thousand dollars into a Roth without breaking any rule.
The idea is not new, but it is easy to botch, and a small mistake can turn a smart move into an unexpected tax bill. Here is how it works and where it tends to go wrong.
Why the front door is locked for you
Direct Roth contributions phase out once modified adjusted income crosses a threshold that, for joint filers, lands in the low six figures and closes completely a bit higher. A single earner above roughly $160,000 faces the same wall. The backdoor exists because the law lets almost anyone contribute to a traditional IRA without an income limit, and it also lets you convert traditional money to Roth. String those two permissions together and the income cap effectively disappears, at least for the conversion step.
The two steps, spelled out
First, you put after-tax dollars into a traditional IRA, meaning you get no deduction because your income is too high to claim one. Second, you convert that same money into a Roth IRA. Since you already paid tax on the contribution, the conversion itself is mostly tax-free, and everything the account earns afterward grows tax-free. Compare this with simply parking the cash in a taxable brokerage account, where every dividend and sale can create a tax bill each year; the backdoor Roth shelters that future growth instead.
The pro-rata rule is the trap
The move works cleanly only if the traditional IRA you use is empty of pre-tax money beforehand. If you already hold a traditional IRA with deductible contributions from earlier years, the tax code treats all your traditional IRAs as one pile. Converting the new after-tax dollars then pulls out a proportional mix of pre-tax and after-tax money, and the pre-tax slice gets taxed on the conversion. A saver who forgets this can owe tax on a chunk they thought was already clean, which surprises plenty of people at filing time.
Run the backdoor in four careful steps
- Confirm you have no pre-tax dollars sitting in any traditional, SEP, or SIMPLE IRA; roll those into a workplace plan first if you do.
- Make a non-deductible traditional IRA contribution, and note the after-tax basis on your tax form.
- Convert the balance to Roth quickly, ideally within days, so little growth accrues that would otherwise be taxed.
- File the required forms the following spring so the contribution and the conversion are both reported.
Watch the fine print before you convert
The catch is that the strategy brushes against an old rule, the step-transaction doctrine, which lets the government collapse linked moves into one. Most practitioners treat the backdoor as settled for now, but a future law could tighten or end it, so do not treat it as permanent. State taxes vary too; a few states have taxed the conversion differently than federal rules, so the same move can cost more depending on where you live. And if you convert near a market peak, the account value you convert is higher, which can nudge you into a larger taxable slice than you planned if any pre-tax money is mixed in.
Who should skip this entirely
If your income is below the direct Roth limit, just contribute the normal way and skip the extra paperwork. If you have a large pre-tax IRA you cannot move into a workplace plan, the pro-rata tax may swallow the benefit. And if you expect to live abroad or change states soon, run the numbers with someone who knows both jurisdictions before converting, because the upfront tax cost might outweigh the long-term gain. For the typical high earner with a clean slate of IRAs, though, the backdoor remains one of the few perfectly legal ways to keep building tax-free savings past the usual income wall.
