I work in Cook County, Illinois, which is an at will state. The company I work for is very small, 7 employees total, and only pays us once a month on the last business day. The owners are very petty and will nickel and dime my last paycheck as much as possible if I were to notify them ahead of time, so I am planning on quitting at the end of the month without notice. We receive all of our PTO, 10 days, on Jan 1st each year and have access to it immediately. I have already used 8 days for taking time off to visit my girlfriend in Indiana, and plan to use the last two days to visit her during our anniversary at the end of the month. After looking through the company policy handbook, I saw that nothing mentions how overused PTO is handled with final paychecks. My question is: can my employer legally take out back pay for over used PTO based on the prorated amount at the time I quit if there was no policy written and signed by the employees stating they would do this?