 With this latter payment approach, known as a "Single Premium Policy", the money borrowed from the provider to pay for the insurance policy incurs additional interest, typically at the same APR as is being charged for the original sum borrowed, further increasing the effective total cost of the policy to the customer.Payment protection insurance on credit cards is calculated differently from lump sum loans, as initially there is no sum outstanding and it is unknown if the customer will ever use their card facility.However, in the event that the credit facility is used and the balance is not paid in full each month, a customer will be charged typically between 0.78% and 1% or £0.78 to £1.00 from every £100 which is a balance of their current card balance on a monthly basis, as the premium for the insurance.