24 CFR § 220.811
Date of default
February 22, 2021
For the purposes of §§220.800 et seq., the date of default shall be considered as:
(a) The date of the first uncorrected failure to perform a covenant or obligation under the note or security instrument; or
(b) The date of the first failure to make a monthly payment which subsequent payments by the borrower are insufficient to cover when applied to the overdue monthly payments in the order in which they became due.