DELINQUENCY: The day after a payment is due, a loan is DELINQUENT if there are no other unpaid payments. If the grace period runs until the 16th of each month (as it does for all FHA loans) and payments are posted each month on the 10th, then the loan becomes DELINQUENT for a short period each month.
DEFAULT: A loan is IN DEFAULT as soon as any payment has been due and unpaid for more than 30 days. Lenders often have subdivided collection departments dealing with loans that are in different stages or default.