It is also changeable in the 1099-R interview when you have a Traditional IRA distribution. The interview will as for prior years basis. If the carry-over amount is not correct, it can be changed by entering the correct amount that goes on the 8606 line 2, and an explanation statement.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
