Dunno if it's the same in other countries, but in the US tax forms label each field like 1b, 12a, 13, 14, etc. Might be a good idea to do that too! Love the concept for the game :)
I considered that but with my current text and layout, as well as rather small resolution, I think it would be a little too hard to read. If i end up reworking my text then I might.