I had my grace period cut from 25 days to 20 on a Chase card. Happened without any notification and I almost missed my payment due date (it moved by the same 5 days). As it was, since payment was now due before I got my paycheck, I could only make minimum payment. But I then paid it in full 2 days later, once my paycheck had deposited. Cheeky buggers. In my opinon trying to pull a fast-one to get a late fee and/or change my interest rate and T&Cs.