The amount you will save through a balance transfer depends on your balance amount, the old card’s interest rate and the length of the introductory APR offer. For example, let’s say you transferred a $3,500 balance to a new card with an 18-month introductory offer and a 3% transfer fee. You would pay off the entire balance in 15 months by making $250 monthly payments and only paying $105 in fees. If your old card charged 14.99% APR and made the same $415 monthly payments, it would take you 16 months to pay off the $3,500 balance, and you would pay $322 in interest.