You want to use code P and enter it as 2025 Form 1099-R. Since you took the excess out in 2025, the 1099-R will be for tax year 2025, but you need to report it on your 2024 return, which is what code P (taxable the prior year) does.
Code 8 would be used if you got the excess out in 2024 and received a 2024 Form 1099-R (an excess contribution made and withdrawn in the same year). But since you took the excess out in 2025, the 1099-R will be for tax year 2025 and you will use Code P. TurboTax will ask what year the mock 1099-R you are entering is for - you will answer 2025 since the distribution was done in 2025. @markrocknroll
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