Backdoor Roth IRA Calculator
High income over the Roth IRA limit? The backdoor Roth strategy lets you contribute anyway — but the IRS pro-rata rule can trigger unexpected taxes if you have other traditional IRA funds. Use this calculator to estimate your conversion tax and project your tax-free Roth growth over time.
Conversion Tax Calculator
Estimate how much tax you'll owe on your backdoor Roth conversion using the IRS pro-rata rule.
Sum of all pre-tax (deductible) IRA balances across all accounts
2025 IRA contribution limit: $7,000 ($8,000 if age 50+)
Any earnings between contribution and conversion date
Your highest federal income tax bracket
Tax-Free Amount
$7,000Tax Owed on Conversion
$0Effective Tax Rate
0.00%| Total IRA Balance (all accounts) | $7,000 |
| Non-Deductible (after-tax) Basis | $7,000 |
| After-Tax Percentage | 100.00% |
| Conversion Amount | $7,000 |
| Taxable Portion of Conversion | $0 |
| Tax-Free Portion of Conversion | $7,000 |
| Tax Owed | $0 |
Roth Growth Projector
Project the tax-free growth of your Roth IRA over time with annual contributions.
Starting balance after your first conversion
Amount added each year via backdoor conversion
Historical stock market average ≈ 7% real return
Number of years to project growth (1–50)
Projected Value
$714,511Total Contributions
$217,000Tax-Free Growth
$497,511| Year | Balance |
|---|---|
| 1 | $14,490 |
| 2 | $22,504 |
| 3 | $31,080 |
| 4 | $40,255 |
| 5 | $50,073 |
| 6 | $60,578 |
| 7 | $71,819 |
| 8 | $83,846 |
| 9 | $96,715 |
| 10 | $110,485 |
| 11 | $125,219 |
| 12 | $140,985 |
| 13 | $157,853 |
| 14 | $175,903 |
| 15 | $195,216 |
| 16 | $215,882 |
| 17 | $237,993 |
| 18 | $261,653 |
| 19 | $286,968 |
| 20 | $314,056 |
| 21 | $343,040 |
| 22 | $374,053 |
| 23 | $407,237 |
| 24 | $442,743 |
| 25 | $480,735 |
| 26 | $521,387 |
| 27 | $564,884 |
| 28 | $611,426 |
| 29 | $661,226 |
| 30 | $714,511 |
Frequently asked questions
What is a backdoor Roth IRA?
A backdoor Roth IRA is a two-step strategy that lets high-income earners contribute to a Roth IRA even if they exceed the direct contribution income limits ($165,000 single / $246,000 MFJ for 2025). You first make a non-deductible contribution to a traditional IRA (no income limit), then convert those funds to a Roth IRA. While the conversion may trigger some tax if you have other pre-tax IRA funds (due to the pro-rata rule), the money then grows tax-free forever.
What is the pro-rata rule and how does it affect my backdoor Roth?
The IRS pro-rata rule (IRC §408(d)(2)) requires that all your traditional, SEP, and SIMPLE IRA balances be treated as a single pool when calculating the taxable portion of any conversion. If you have $93,000 in pre-tax IRA funds and contribute $7,000 non-deductible, only 7% of your conversion is tax-free — the other 93% is taxable income. To avoid the pro-rata rule, consider rolling your pre-tax IRA funds into your employer's 401(k) plan before doing the backdoor conversion.
Who should use the backdoor Roth IRA strategy?
The backdoor Roth is most beneficial for high-income earners who exceed the direct Roth IRA income limits, expect to be in a similar or higher tax bracket in retirement, and have no (or minimal) existing pre-tax IRA balances — or can roll pre-tax funds into a 401(k) to sidestep the pro-rata rule. It is especially powerful for younger investors with many years for tax-free growth to compound.
What are the 2025 income limits for a direct Roth IRA contribution?
For 2025, the ability to contribute directly to a Roth IRA phases out at $150,000–$165,000 for single filers and at $236,000–$246,000 for married filing jointly. Above these limits, direct contributions are not allowed — but the backdoor strategy has no income limit. The annual IRA contribution limit is $7,000 ($8,000 if you are age 50 or older).