Profits and Losses

In recent times, credit card portfolios have been very profitable for banks, largely due to the booming economy of the late nineties. However, in the case of credit cards, such high returns go hand in hand with risk, since the business is essentially one of making unsecured (uncollateralized) loans, and thus dependent on borrowers not to default in large numbers.

Minimum Payments

In the UK, there has recently been increasing concern about the minimum payments required on outstanding credit card balances. Until the mid-1990s the required minimum monthly payment was generally 5% of the outstanding balance, but competition in the last 15 years to attract customers has led to this figure being eroded on the premise that the minimum monthly payment to service a debt will be lower. Typically, credit card companies now only require a monthly minimum payment of between 2% and 3% of the outstanding balance, or a fixed cash fee, whichever is the greater. For example, on a debt of £1,000, the card holder can expect to pay back only £20 - £30 per month.

Unfortunately, some people are not aware of how long it can take to repay a debt when only paying the minimum each month. An example of this: by paying 2.5% of the debt each month, while accruing interest at 14% (in line with modern credit card interest rates), it can take over 14 years to pay back an original debt of £1,000, and roughly £10,500 will have been paid back.

It has recently been suggested that credit card companies include a warning on their statements discouraging customers from paying only the minimum, however few companies have so far acted upon this. Companies which do include a warning tend not to inform customers how long full repayment will take, i.e. they discourage users from making just minimum payments but do not explain why. Less financially savvy customers may ignore these empty warnings as a result.

Starting in 2006, most US credit card companies regulated by the Office of the Comptroller of the Currency have been required to increase customers' minimum payments to cover at least the interest and late fees from the prior statement plus 1% of the outstanding balance. The reason is to avoid a negative amortization situation which may result when the previous 3% minimum was enforced. Negative amortization is when the payment to the creditor fails to cover the amount of interest charged during that period. This causes the consumer's credit card balance to continually increase.

Trailing Interest

Trailing interest, sometimes called final or residual interest, is a method of calculation whereby interest is charged right up until the day of a full payment. Cardholders of banks that use this method receive a bill with the balance owing and interest accrued and pay it off in full. On the next statement they are billed a "final" amount of interest even if no purchases or cash advances have been debited since. The reason for this is that interest continues to accrue from the time of the close of the previous statement until the day the payment for that statement is actually received.

In comparison to the normal method of interest calculation, this method is judged by many to be a hidden and thus unfair cost. Uninformed cardholders often inquire as to what amount they need to pay by their due date in order to have paid off their credit card in full and to stop interest from accumulating. They then proceed to pay off this amount under the belief that they are finished paying interest charges, only to find trailing interest on their next statement which was posted to their account on the day of the statement billing (so even if they check their balance a day before that next billing date, it would still show a zero balance).

Hidden Costs

Merchants pay a negotiated fee -- typically 1-3% for larger merchants and 3-6% for smaller merchants -- to process credit payments. They must also bear the cost of providing a point-of-sale solution to enable the acceptance of card transactions and other card services related expenses. Credit card issuers understand full well that if card holders were aware of and made to pay these additional costs with their purchases it would tend to discourage credit card usage. As a consequence, businesses who accept credit cards often must sign a "merchant agreement" or contract with the acquirer that stipulates that they are not allowed to offer different prices for card and non-card transactions (sometimes referred to as surcharging) despite the additional costs to the business for accepting the cards. The prohibition on surcharging or cash discounts is enforced by law in some countries, although some governments are beginning to lift this restriction (see below).

Some critics have observed that this results in what is effectively a hidden tax on all transactions conducted by merchants who accept credit cards since they must build the cost of transaction fees into their overall business expense. Furthermore, cash and other non-credit card using customers are in effect made to subsidize credit card user purchases. The cost of the convenience and protections enjoyed by card holders and the profits taken from transaction fees by the card industry (which has come to rely increasingly on this revenue stream over the years) is in part borne by the non-card purchaser. Critics further note that the customers most likely to pay in cash are probably the least able to afford the additional expense, the argument going that card holders are more likely to be affluent and non-card holders less so.

A counterargument is that there are also costs to the merchant in other forms of payment. For cash payments these include frequent trips to the bank or use of an armored delivery service, theft, and employee error, such that cash is actually not cheaper for the merchant than credit cards

Credit Card Numbering

The numbers found on credit cards have a certain amount of internal structure, and share a common numbering scheme.

The card number's prefix, called the Bank Identification Number, is the sequence of digits at the beginning of the number that determine the bank to which a credit card number belongs. This is the first six digits for Mastercard and Visa cards. The next nine digits are the individual account number, and the final digit is a validity check code.

In addition to the main credit card number, credit cards also carry issue and expiration dates (given to the nearest month), as well as extra codes such as issue numbers and security codes. Not all credit cards have the same sets of extra codes nor do they use the same number of digits.