Certain types of purchases (such as those you may make at gas stations, restaurants or hotel reservations) require a pre-authorization that temporarily puts a hold on a portion of your card funds. This hold could be greater than the cost of your purchase. Once your purchase is processed, the money will be released and your balance will be adjusted.  Please note that this hold on funds may take up to 10 business days to be released back to your card account balance (and up to 90 days for car rentals).