5 C.F.R. § 831.1405 Ordinary and necessary living expenses.
Title 5 - Administrative Personnel
An individual's ordinary and necessary living expenses include rent, mortgage payments, utilities, maintenance, food, clothing, insurance (life, health and accident), taxes, installment payments, medical expenses, support expenses when the annuitant is legally responsible, and other miscellaneous expenses which the individual can establish as being ordinary and necessary.
Title 5: Administrative Personnel
PART 831—RETIREMENT
Subpart N—Standards for Waiver of Overpayments
§ 831.1405 Ordinary and necessary living expenses.