The procedure and frequency for payment requests depend upon the payment method, as follows:

(a) For either reimbursements or advance payments, the TIA must allow recipients to submit requests for payment at least monthly. The contracting officer may authorize the recipients to use the forms or formats described in 10 CFR 600.312(d).

(b) If the payments are based on payable milestones, the recipient will submit a report or other evidence of accomplishment to the program official at the completion of each predetermined activity. If the award is an expenditure-based TIA that includes minimum cost sharing percentages for milestones (see 10 CFR 603.570(c)), the recipient must certify in the report that the minimum cost sharing requirement has been met. The contracting officer may approve payment to the recipient after receiving validation from the program manager that the milestone was successfully reached.