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@ rskoss wrote:
This doesn't work in TT 2018. When I enter the adjustment, TT tells me the interest cannot be previously reported because it is regular interest.

It's been a while since your post, but I'll leave this for anyone else who stumbles onto this old thread.

 

Savings Bond interest is entered in Box 3 of the 1099-INT.   It sounds like you entered it in Box 1 by mistake.  When correctly entered in Box 3, then on a subsequent screen it should allow it to be adjusted, if necessary.