What Is a Backdoor Roth IRA? The High-Earner Strategy Explained Simply

Why Can't High Earners Contribute Directly to a Roth IRA?

Roth IRA contributions phase out at $150,000-$165,000 for single filers and $236,000-$246,000 for married filing jointly (2025). If your income exceeds these limits, direct contributions are not allowed.

But there's no income limit on traditional IRA contributions (they're just not deductible at high incomes) and no income limit on Roth conversions. The backdoor strategy exploits this gap: contribute to a traditional IRA (non-deductible), then convert to Roth. The result is the same as a direct Roth contribution.

The IRS has explicitly acknowledged this strategy, and the Build Back Better Act's proposed ban on backdoor Roths did not pass. As of 2026, it remains legal.

What Is the Pro-Rata Rule and Why Does It Matter?

The pro-rata rule is the most common trap. If you have any pre-tax money in any traditional IRA (including SEP and SIMPLE IRAs), conversions are taxed proportionally across ALL your IRA balances — not just the non-deductible contribution.

Example: You have $95,000 pre-tax in a rollover IRA and contribute $7,000 non-deductible. Your total IRA balance is $102,000, of which 6.9% is after-tax. If you convert $7,000, only 6.9% ($483) is tax-free — the rest ($6,517) is taxable.

The solution: roll your pre-tax IRA balances into your employer's 401(k) (if it accepts rollovers) before doing the backdoor conversion. This removes the pre-tax money from the pro-rata calculation. With only the non-deductible $7,000 in your traditional IRA, the conversion is nearly tax-free.

How Do You Actually Execute the Backdoor Roth?

Step 1: Confirm you have no pre-tax IRA balances (or roll them into a 401(k)). Step 2: Contribute $7,000 ($8,000 if 50+) to a traditional IRA as a non-deductible contribution. Step 3: Convert the traditional IRA to your Roth IRA (usually a same-day transfer at your brokerage). Step 4: File Form 8606 with your tax return to document the non-deductible contribution.

Timing: most people do the contribution and conversion in January, giving the Roth the full year to grow tax-free. Some convert the same day to avoid any growth in the traditional IRA (which would be taxable on conversion).

The mega backdoor Roth — using after-tax 401(k) contributions — allows up to $46,000+ additional Roth funding annually if your employer plan permits it.

Want to See If the Backdoor Roth Fits Your Strategy?

The analysis at myaifinancialplan.com models Roth conversion strategies — including backdoor and mega backdoor — within your full tax and retirement picture. Start free at myaifinancialplan.com.