Your statement will tell you how much interest you would be charged if you made only the minimum repayment on the date that it was due. This is the maximum amount of interest you would incur in the following month if you did not use your card again. This provides a guide to the cost of borrowing on your card.
This estimated interest is provided to help you plan the level of your repayment for the next month. It gives you a clear idea of what the interest charge will be next month if you make only the minimum repayment in the current month.