Hi abcd8: I saw similar as you when I tried to do amended 2021 return except Fed showed 0 and state due showed -$16 and like you I expected both to be 0 which is what their documentation says we should expect. No idea why state showed -$16 but $16 was what state underpayment tax penalty was which I paid when I filed with Turbo Tax.
My main problem with Turbo Tax is worse than this. I did not know Turbo Tax messed up with math errors form 2210 which I nevertheless filed successfully with IRS & state on Feb 17th. The taxes due numbers changed the following week after one of their updates. After several changes to their program including the last one on March 19th the math errors are gone now and I overpaid late payment penalties on Federal return only. Even though 2021 Fed shows 0 using amended tax program I can't use it because their updates to program fixed my tax return as it should have been when I filed the first time. My submitted errors are now gone from my .tax2021 file as it was changed to what I have now with the update. I may just say the heck with it since I overpaid and not underpaid as I would have to manually fill out 1040-x to show what changed to the version I now have which is correct. I am glad I saved pdf versions of what I filed as I cannot recreate that incorrect data using Turbo tax. Since I would have to mail file the amended forms due to Turbo Tax snafu and not e-file, I probably won't bother and just hope IRS fixes it and sends me a check. I bought Turbo Tax download version so I would have not to check math manually but you can't even trust them to add correctly.
