Roger, thank you for asking for more info.
Yes, I entered 8 different states that posted interest payments on munies in 2025, each using their specific State digraph. When TT checked for errors after all income and deduction data was completed using Deluxe prior to filing, TT flagged the compiled 1099-INT as having the erroneous MX State code. It was not I who had entered MX; TT did that.
At this point, I am left with three options and don't know which one is best for IRS purposes:
a. Accept the MX TT gave me, ignore it, and file;
b. Go into the form, change it to the State digraph from which I got the highest interest payment, and file; or
c. Go into the form, delete the MX leaving the State code blank (this may pop up a TT error message again), and file.
