45 C.F.R. § 30.22
(a) Compromise. The Secretary may compromise a debt if the full amount cannot be collected based upon inability to pay, inability to collect the full debt, cost of collection, or doubt debt can be proven in court.
(1) Inability to pay. The debtor is unable to pay the full amount in a reasonable time, as verified through credit reports or other financial information. In determining a debtor's inability to pay the full amount of the debt within a reasonable time, the Secretary will obtain and verify the debtor's claim of inability to pay by using credit reports or a current financial Statement from the debtor, executed under penalty of perjury, showing the debtor's assets, liabilities, income, and expenses. The Secretary may use a Departmental financial information form or may request suitable forms from Justice or the local United States Attorney's Office. The Secretary also may consider other relevant factors such as:
(2) Inability to collect full debt. The Government is unable to collect the debt in full within a reasonable time by enforced collection proceedings.
(3) Cost of collection. The cost of collecting the debt does not justify the enforced collection of the full amount.
(4) Doubt debt can be proven in court. There is significant doubt concerning the Government's ability to prove its case in court.