We do not have enough information from you so all we could do is guess. Did you receive a letter from the IRS or your state? TurboTax does not get any information from the IRS or your state after your return is filed, so no one at TT knows what they changed or challenged on your return. As VolvoGirl said, most errors are user errors due to either missing information that you did not enter, or information entered incorrectly in some way--either by typos in data entries or by entering data in the wrong place or under the wrong name on a joint return.
(what the letters from the IRS mean)
I GOT A LETTER FROM THE IRS
https://ttlc.intuit.com/questions/3605673-i-got-a-letter-or-notice-from-the-irs
If you tell us more we may be able to help you figure out what happened.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
