Form 8606 part I basis

Forum|Forum|5 months ago
February 26, 2026
2 replies
130 views

My form 8606 shows an incorrect IRA basis in Part I line 14. I have been doing backdoor Roth conversions for the last 10 yrs. Every year is the same process. I have never had, nor entered a previous year basis, since I have always completely converted my traditional IRA balance every year. This year (2025 tax yr) my form 8606 shows a non zero number for the basis on line 14. I have entered a zero basis in the q&a, so not sure where this number comes from. I have re-entered the info from my 1099R, but still shows the incorrect basis. Where does this number come from where I can change it to zero?

baldietax

Level 12

what's happening on the rest of the 8606? Does line 8 show your 1099-R conversion, Line 13 should show the nontaxable amount and Line 14 is the basis left over, it's a calculated field not something you would or should adjust. If it's not zero that means something has not been entered or answered correctly across the 1099-R and IRA contribution sections so you should go back thru them.

https://ttlc.intuit.com/turbotax-support/en-us/help-article/retirement-benefits/enter-backdoor-roth-ira-conversion/L7gGPjKVY_US_en_US

DanaB27

Employee Tax Expert

To clarify, was your value of all your traditional/SEP/SIMPLE IRAs $0 at the end of 2025?

Another option, did you have a loss before you made the conversion? If yes, then it is possible to have a left over basis that is carried over to the future.

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