I've already found one. If you have college tuition and claim it on line 35 on the 1040, which is where you claim a straight deduction, and then go to the Maryland's tax form, Maryland will add it in as Additions to Income, code O.
A code O comes up as an error, if you override it, you cannot e-file, you cannot correct it, because according to instructions code O is the proper code. So guess what the next step is? Print, sign, fold and in an envelope it goes.
A code O comes up as an error, if you override it, you cannot e-file, you cannot correct it, because according to instructions code O is the proper code. So guess what the next step is? Print, sign, fold and in an envelope it goes.