32 CFR § 3.6 - Limitations on cost-sharing.
(a) When a nontraditional Defense contractor is not participating to a significant extent in the prototype project and cost-sharing is the reason for using OT authority, then the non-Federal amounts counted as provided, or to be provided, by the business units of an awardee or subawardee participating in the performance of the OT agreement may not include costs that were incurred before the date on which the OT agreement becomes effective. Costs that were incurred for a prototype project by the business units of an awardee or subawardee after the beginning of negotiations, but prior to the date the OT agreement becomes effective, may be counted as non-Federal amounts if and to the extent that the Agreements Officer determines in writing that:
(1) The awardee or subawardee incurred the costs in anticipation of entering into the OT agreement; and
(2) It was appropriate for the awardee or subawardee to incur the costs before the OT agreement became effective in order to ensure the successful implementation of the OT agreement.
(b) As a matter of policy, these limitations on cost-sharing apply any time cost-sharing may be recognized when using OT authority for prototype projects.