If I performed a backdoor conversion from a traditional IRA to a Roth IRA for the year 2025 in 2026 how do i add this into my tax return if I did not receive a 1099R?

[Opus 17]

Contributions can be retroactive, but conversions only happen when they happen.  If you did a conversion in 2026, it will be reported on your 2026 tax return. 

[DavidD66]

You should have received a Form 1099-R from your financial institution.  If can probably access online by logging in to your account.  If not, you should contact them and request a copy.  You need it to  report the back door Roth. 

[dmertz · Accepted solution]

Because the Roth conversion occurred in 2026, you will receive a 2026 Form 1099-R to be reported on your 2026 tax return.  The basis that should be present on line 14 of your 2025 Form 8606 will carry forward to line 2 of your 2026 Form 8606 to be used in calculating the nontaxable amount of this Roth conversion (and any other traditional IRA distributions that might occur in 2026.