Yes. You should amend your 2024 return using Form 1040-X to correctly report the inherited IRA RMD and restore your Traditional IRA basis.
Since your 2024 Form 1040 Line 4b is blank, it means y...
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Yes. You should amend your 2024 return using Form 1040-X to correctly report the inherited IRA RMD and restore your Traditional IRA basis.
Since your 2024 Form 1040 Line 4b is blank, it means you did not pay taxes on that $2,305 RMD. Additionally, your Form 8606 used up $2,305 of your $8,000 nondeductible basis to cover that distribution.
This means that you paid for your RMD using your own post-tax basis. This is a mistake because basis does not transfer between inherited an IRA and your own IRA.
To avoid double taxation, once because you lost the basis for your future Roth conversion and again when the IRS realizes the RMD should have been taxable income, you should amend your 2024 return so that Line 4b shows the $2,305 as taxable. Also, you should correct your Form 8606 so that Line 2 (total basis) remains the full $8,000.
This error likely occurred because the inherited IRA was not correctly identified. If the Form 1099-R for the inherited RMD was not flagged correctly as inherited, or death distribution using Code 4 in Box 7 and if the "I inherited this IRA" box was not checked, TurboTax likely assumed it was a standard distribution from your own IRA. It then looked at your $8,000 nondeductible contribution and applied the pro-rata rule, shielding the RMD with your basis.
The activity appears both in 2024 and 2025 because in 2024, you made the contribution, establishing your basis of $8,000, but you performed the conversion in the 2025 calendar year. Form 8606 tracks that 2024 basis and carries it forward to ensure you don't pay tax on that $7,485 when you file your 2025 return.
Yes. It does matter if the conversion carryover is overstated. If your 2025 Form 8606 shows a conversion of $7,485 and uses $7,485 of basis, you have $515 of leftover basis. The $515 remains in your Traditional IRA as basis for future years. If you report $0 basis, you lose the ability to withdraw that $515 tax-free in the future. If, on the other hand, you tell them you have $8,000 left, you are claiming a basis amount you have already partially used.