Thanks Captain obvious but I am not doing a 1040 return.  You obviously don't prepare 1041 Trust returns.  There is no option to pick Montana as a state when filing a TRUST TAX return in Pro Series. Under state products when adding it lists 1041 and you check mark it. CA for example is 541 when you do the return.  I was asking why Pro Series doesn't support it. It appears MT has a Trust return that has to be filled out manually since Pro Series doesn't support for unknown reasons.