Tax help for military filers

It is more complicated than it seems. First of all, MD does require that a return be filed (pages 1 & 2 of the instructions). However, both the military pay and the wages of the spouse are subtracted from income. The wages of the spouse are code gg for the subtraction. This is seen on page 9 of the MD instructions for nonresidents.

You need to enter the wage subtraction in the program. Unfortunately, it seems to be through the Forms mode of the desktop program rather than the online version. It is an easy switch, see how to switch to desktop.