24 CFR §201.61

1. (a)Liability. A debtor is liable to the Secretary for the principal amount of the debt, as described in paragraphs (b), (c), or (d) of this section, as appropriate.
2. (b)Property improvement notes. In the case of an assigned note for a property improvement loan, the principal amount of the debt is the unpaid amount of the loan obligation, as defined in § 201.55(a)(1) of this part, plus amounts described in §§ 201.55(a) (3), (4), (5).
3. (c)Manufactured home notes. In the case of an assigned note for a manufactured home loan, the principal amount of the debt is the unpaid amount of the loan obligation, as defined in § 201.55(b)(1) of this part, plus amounts described in §§ 201.55(b) (3) through (8).
4. (d)Assigned judgments. In the case of a judgment obtained by the lender on a property improvement loan or a manufactured home loan and assigned to the Secretary, the principal amount of the debt is the amount of the judgment.