Best advice I can give you is to see what it was to be at 100 percent.. write it down...then go back and multiply that figure by the percentage of busn use.. and see if the program has altered it to the proper amount.    I've had people that have depreciated their building full time every year then one time they use it personally for an entire year.. so what happens is they loose that full year of depreciation.  it's never left to take the amount they lost in another year.. it's gone.     Hope I helped you.