What number do you call to find out the amount of back illinois state taxes you owe?

Try to call Illinois Revenue Office. Their phone numbers are 800 732-8866 and 217 782-3336. Or you can visit their local offices if you are in one of those regions: Chicago, Marion, Des Plaines, Rockford, Fairview Heights and Springfield. Their offices open Monday through Friday, 8 am - 5 pm