How do contractors know when to pay the IFF?

Contractors must report contract sales to GSA within 30 calendar days following the completion of each reporting quarter. Clause 552.238-74 defines calendar quarters and defines four acceptable points at which contractors may report sales.

Additionally, it specifies that GSA will provide the contractor with specific written procedural instructions on remitting the IFF within 60 days of award of a new contract. If no sales occur on a contract during a quarter, the contractor is still responsible for filing the sales report by entering zeroes.