HOW MUCH OF MY RENT CAN I DEDUCT FOR BEING A HOME CHILD CARE PROVIDER 5 DAYS WK 8HRS DAY for 5 CHILDREN?

I PROVIDE CARE FOR MY SISTER CHILDREN IN IL IN MY HOME OVERNIGHT. 5 DAY DAYS A WK FOR 8 HRS A DAY. i GET PAID BY THE STATE OF IL FOR ONLY 4 DUE TO AGE OF THE 5TH CHILD. I PAY $805 A MONTH FOR RENT, I STARTED PROVIDING CARE IN APRIL OF 2015.