The Prompt Payment Act (31 U.S.C. Chapter 39) mandates that federal agencies pay vendors on time. Specifically, if a contract specifies a due date for payment, agencies are required to pay by that date. If no specific due date is mentioned, payment must be made within 30 days after the later of either:

Receipt of a proper invoice, or

Acceptance of goods/services.

If agencies fail to pay by the due date, they must automatically calculate and pay interest penalties to the vendor.

Relevant Standards and References:

31 U.S.C. § 3903 (Prompt Payment Act): “A payment is timely if it is made by the due date prescribed by the contract or within 30 days after receipt of a proper invoice or acceptance of goods or services.”

OMB Circular A-125, “Prompt Payment,” Section 7(a)

Treasury Financial Manual (TFM), Volume I, Part 6, Chapter 8040

Therefore, Option D is correct.