48 CFR § 32.608-1
Interest charges
November 17, 2020
Unless specified otherwise in the clause at 52.232-17, Interest, interest charges shall apply to any contract debt unpaid after 30 days from the issuance of a demand unless—
(a) The contract is a kind excluded under 32.611; or
(b) The contract or debt has been exempted from interest charges under agency procedures.