Never accept "in arrears, upon completion of project" (Section B1.3 in "Continuation of SF Form 1449 Blocks" of the solicitation). This means invoicing cannot begin until entire project is complete and all systems/rooms are signed off and accepted. Below is an example of terms which are acceptable (invoice for materials and installation separately). This usually requires negotiating with the C.O. during the presoliciation or early in the solicitation phase and DEFINITELY before due date and prior to Award. If negotiated post award, it slows the process as the award contract (PO) requires an official Modification.
