If you can prepay you bills with a credit card sign up bonus, you can generate 10-20% savings. I have at times been able to get discounted Visa Giftcards from Giftcards.com when they run promos throughout the year for 5-10% off

Those would be only times I’d prepay bills as it generates tax free savings for you. If the landlord can give you an additional discount that may be of benefit as well.

Otherwise there are potential issues prepaying early that have already been outlined by other users.