I understand that you are filing a Maine return, but the error you are encountering sounds a lot like an error that happens with Alabama tax returns. Therefore I am sharing information about the Alabama error in case it helps your situation:
Reject code AL40-050 indicates a math error on the Alabama return. This is typically caused by having a W-2 from another state included with your return, possibly a state that does not have a state income tax.
If one of the W-2s was issued from a state that does not have any state income tax and there was no state information included on that W-2, it is the one causing the mismatch with the Alabama return. Try entering the box 1 amount on that W-2 in box 16. This should clear the math error on the Alabama return.
If you have determined that all of your W-2s have been entered accurately for boxes 15, 16, and 17 and the electronic filing error continues, then your only choice is to file the Alabama state return by mail.
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