A nonperforming asset (NPA) refers to a classification for loans on the books of financial institutions that are in default or are in arrears on scheduled payments of principal or interest. In most cases, debt is classified as nonperforming when loan payments have not been made for a period of 90 days. While 90 days of nonpayment is the standard period of time for debt to be categorized as nonperforming, the amount of elapsed time may be shorter or longer depending on the terms and conditions set forth in each loan.