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Backdoor Roth IRA Calculator

Determine if a backdoor Roth IRA conversion makes sense for you. Check for pro-rata rule issues and calculate the tax impact.

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The Backdoor Roth IRA Explained

Roth IRA contributions have income limits: $161,000 AGI for single, $240,000 for married filing jointly (2025). If you earn above these limits, you cannot contribute directly to a Roth IRA. The backdoor Roth is a legal workaround: (1) Contribute to a non-deductible Traditional IRA (no income limit), then (2) immediately convert it to a Roth IRA. Since the contribution was after-tax (non-deductible), the conversion is tax-free — you effectively made a Roth contribution despite being over the income limit.

The critical trap: the pro-rata rule. If you have ANY pre-tax money in ANY Traditional, SEP, or SIMPLE IRA, the conversion is partially taxable. The IRS treats all your Traditional IRAs as one pool. If you have $50,000 in a pre-tax Traditional IRA and convert a $7,000 non-deductible contribution, 87.7% of the conversion ($6,140) is taxable. The fix: roll your Traditional IRA balance into your employer's 401K before doing the backdoor conversion. This eliminates the pro-rata issue. Compare Roth strategies with our Roth IRA Calculator.

Is the Backdoor Roth Worth It?

For high earners, absolutely. $7,000/year invested in a Roth at 7% for 25 years grows to approximately $475,000 — entirely tax-free. In a taxable account at the same return, after 15% capital gains tax, you'd keep roughly $410,000. The Roth advantage: $65,000 in tax savings, plus no RMDs, no tax on withdrawals, and tax-free inheritance for beneficiaries. Over a career of annual backdoor Roth contributions, the cumulative tax-free wealth can exceed $1M+. This strategy is one of the most valuable tools available to high-income earners. Plan your full retirement with our Retirement Calculator.

People Also Ask

Is the backdoor Roth IRA legal?
Yes — it was explicitly confirmed in the Tax Cuts and Jobs Act of 2017 and has been upheld by the IRS. Build Back Better attempted to eliminate it in 2021 but the provision was not enacted.
What is the pro-rata rule?
If you have pre-tax money in any Traditional IRA, you cannot selectively convert only the after-tax portion. The IRS treats the conversion as a proportional mix of pre-tax and after-tax funds.
How do I avoid the pro-rata rule?
Roll your existing Traditional IRA balance into your employer 401K (reverse rollover). Once your Traditional IRA balance is $0, the backdoor conversion is clean and tax-free.
Can I do a mega backdoor Roth?
If your 401K plan allows after-tax contributions AND in-plan Roth conversions, you can contribute up to $69,000 total (2025) and convert the after-tax portion to Roth. This is the "mega" backdoor — up to $46,000/year into Roth beyond the $7,000 IRA limit.