Overdraft loan programs (also called "bounced-check protection" or "courtesy overdraft protection") allow customers to incur debt when their checking account goes into a negative balance. Borrowers are charged a flat-fee per check or non-check overdraft and must bring their account to a positive balance within a short time period. The institutions that operate the programs do not disclose an annual percentage rate (APR) because they insist that overdraft loans are not covered by the Truth in Lending Act (TILA).