Why did my bill just increase by over 5%?

Hello user_1xkscq thank you so much for taking the time to reach us regarding your billing questions on our Xfinity Residential Forums.  Rate increases can come from a number of sources including promotion expirations, annual tax/surcharge changes, and one -time purchases. Your Xfinity statement is the best resource as each of these is shown on the bill at least 30 days in advance(one-time fees are charged as they are rented, so these always show on the next bill) 

Understanding Your Xfinity Bill