Backdoor Roth Pro-Rata Calculator: the same conversion, four pools
2026 law · reviewed September 5, 2026
| Other pre-tax IRAs at year end | Basis share of the pool | Taxable part of the conversion | Basis left behind |
|---|---|---|---|
| $0 | 100.0% | $0 | $0 |
| $25,000 | 23.1% | $5,769 | $5,769 |
| $92,500 | 7.5% | $6,938 | $6,938 |
| $250,000 | 2.9% | $7,282 | $7,282 |
A $7,500 nondeductible contribution converted in 2026, with other pre-tax IRA balances of 0 to $250,000 (Form 8606 lines 5 to 18).
Educational only, not investment, tax, or legal advice. Results are hypothetical estimates that vary with each use and over time and are not guaranteed accurate or complete. Using this tool creates no client relationship with Considerate Capital, and the site that linked here is not affiliated with it. By using it you agree to the tool terms.