Michigan pension exclusions are so convoluted that I don't know how anyone figures them, with or without a computer.  Somehow it gets from the Form 4884 to the schedule for subtractions, but maybe you can't use more than one exclusion per taxpayer, or it automatically figures the better exclusion.  I don't have any Michigan clients, I just took a look at the MI-1040 instructions and it confirms my opinion about a lot of what goes on with Michigan government.