31 CFR §391.4

1. (a)When late charges are waived, the debtor's administrative file shall be properly documented with a memorandum. The memorandum shall contain a brief narrative statement describing the circumstances leading to the waiver and the reason(s) for granting the waiver.
2. (b)A credit report or a financial statement sworn to by the debtor may be required before waiver of late charges is approved for a compromise, suspension, or termination, except where the cost of obtaining such a report or statement exceeds the late charges due.