Credit Card Glossary: Terms and Definitions
		Confused by credit card terms? CreditCards.com's glossary of credit card definitions will help. From account holder to Regulation Z, we have defined the most-common and most-confusing credit card terms.

Margin

The number of percentage points that credit card lenders add to the prime rate (index) to calculate the variable interest rate. For example, if the prime rate is 3.25 percent and the variable rate is 17.24 percent, the margin is 13.99 percent. Issuers must disclose the margin for variable rate accounts at account opening and in each monthly statement.