As nonresidents, the payment we make on our MO-2NR's is called the withholding amount and is equal to the tax due. We do not have to actually withhold throughout the year as our payment amount is low. Yes, I did fill in the entry box you show. This is very frustrating as it seems TT is looking for an estimated payment or something else to match. Anyway I am out the TT e-file fee as I filed by paper. Also as was noted a copy of the MO-2NR is to be attached, but is not in the MO return information within the program
