FAR 42.709—Penalties for Unallowable Costs.

Scope.

FAR 42.709-1, Scope, identifies when the Government’s penalty provisions for expressly unallowable indirect costs may be applied. It implements the statutory authority in 10 U.S.C. 3743 and 41 U.S.C. 4303 and limits the section to two specific submissions: final indirect cost rate proposals and the final statement of costs incurred or estimated to be incurred under a fixed-price incentive contract. In practical terms, this means the rule is not a general cost allowability provision; it is the gateway for assessing penalties when a contractor includes unallowable indirect costs in those required submissions. The section also defines the contracts to which the penalty regime applies—generally contracts over $1 million—while carving out fixed-price contracts without cost incentives and firm-fixed-price contracts for commercial products or commercial services. For contractors, the section signals that certain cost submissions can trigger financial penalties if unallowable indirect costs are included. For contracting officers and auditors, it establishes the threshold question of whether the penalty authority applies before any penalty analysis is performed.

General.

FAR 42.709-2 explains how the Government calculates penalties for certain unallowable indirect costs included in a contractor’s indirect cost proposal. It covers three core topics: the basic penalty for expressly unallowable indirect costs, the enhanced double penalty when the contractor already knew the cost was unallowable before submitting the proposal, and the fact that these penalties are separate from any other administrative, civil, or criminal remedies. It also makes clear that the Government does not need to have actually paid the unallowable cost to assess a penalty. In practice, this section is a deterrent against including improper indirect costs in proposals and a strong incentive for contractors to screen, document, and remove unallowable costs before submission. For contracting officers and auditors, it provides the penalty framework used when evaluating disallowed indirect costs under covered contracts.

Responsibilities.

FAR 42.709-3 assigns responsibility for administering penalties related to expressly unallowable costs in final indirect cost proposals. It covers three core topics for the cognizant contracting officer: deciding whether penalties under FAR 42.709-2(a) should be assessed, deciding whether those penalties should be waived under FAR 42.709-6, and referring matters to the appropriate criminal investigative organization when there is evidence the contractor knowingly submitted unallowable costs. It also assigns the contract auditor a supporting role in reviewing and/or determining final indirect cost proposals by identifying costs that may be unallowable and subject to penalties, documenting the basis for that view, and making criminal referrals when warranted. In practice, this section is about who makes the penalty decision, who supports that decision with audit findings, and how suspected knowing submission of unallowable costs is escalated. It matters because it separates audit analysis from the contracting officer’s decision authority and ensures potential fraud or misconduct is coordinated with criminal investigators when the facts suggest intentional wrongdoing.

Assessing the penalty.

FAR 42.709-4 explains when the cognizant contracting officer must assess a penalty for expressly unallowable costs and when a different penalty applies because the contractor had already been told the cost was unallowable before submitting the proposal. It also identifies the kinds of prior government actions that count as evidence of a prior unallowability determination, including DCAA notices, unappealed contracting officer final decisions, prior board or court decisions, and determinations or agreements under FAR 31.201-6. Finally, it requires the contracting officer to issue a final decision demanding payment of the penalty and to state that the decision is final under the contract’s Disputes clause, while making clear that the penalty demand is separate from any demand to repay amounts already paid for the disallowed cost. In practice, this section is about enforcement: it tells contracting officers when penalties are mandatory, what proof is enough to support them, and how to formally collect them. For contractors, it highlights the risk of submitting costs that are clearly prohibited or previously rejected, because doing so can trigger a penalty in addition to disallowance and repayment.

Computing Interest.

FAR 42.709-5 explains how to calculate interest when a contractor has already been paid for costs later found to be expressly unallowable under the cost principle penalty provisions in FAR 42.709-2(a)(1)(ii). It covers four core topics: when the overpayment is deemed to have occurred, how to handle situations where costs were not paid evenly throughout the fiscal year, which Treasury interest rate applies, the period over which interest must be computed, and how to identify the paid portion of the disallowed costs with help from the contract auditor. In practice, this section ensures the Government can recover not only the disallowed amount but also the time value of money associated with the overpayment. It creates a standardized method for calculating interest so that contractors, auditors, and contracting officers use the same assumptions and avoid disputes over timing or rate. The rule matters because even a relatively small unallowable cost can generate additional liability if it was paid earlier in the fiscal year or remained outstanding for a long period before the demand letter is issued.

Waiver of the penalty.

FAR 42.709-6 explains when the cognizant contracting officer must waive the penalties associated with expressly unallowable costs included in a contractor’s final indirect cost rate proposal under FAR 42.709-2(a). It covers three waiver paths: first, when the contractor withdraws the proposal before the Government formally initiates an audit and submits a revised proposal; second, when the amount of unallowable costs subject to the penalty is $10,000 or less; and third, when the contractor convinces the contracting officer that it has strong policies, training, internal controls, and review systems designed to prevent unallowable costs, and that the specific inclusion of the unallowable costs was an inadvertent error despite due care. The section also defines when an audit is considered formally initiated, using written notice or an entrance conference as the trigger. In practice, this provision gives contractors a limited opportunity to avoid penalties if they self-correct early, if the dollar amount is small, or if they can show a robust compliance environment and a genuine mistake. For contracting officers, it establishes mandatory waiver conditions and requires a fact-based judgment about whether the contractor’s controls and explanation are sufficient.

Contract clause.

FAR 42.709-7 tells contracting officers when to include the clause at 52.242-3, Penalties for Unallowable Costs, in solicitations and contracts. The section focuses on the scope of the clause, the dollar threshold, and the main exceptions, including fixed-price contracts without cost incentives and firm-fixed-price contracts for commercial products or commercial services. It also explains, in practical terms, which contracts are generally considered covered—typically those containing cost-reimbursement or similar cost-based billing clauses such as 52.216-7, 52.216-16, or 52.216-17, or comparable agency supplement clauses. The purpose is to ensure the Government can assess penalties when contractors include expressly unallowable costs in claims for reimbursement or other cost submissions. In practice, this section helps contracting officers identify when the penalty clause must be flowed into the contract and alerts contractors to the heightened risk of submitting unallowable costs under covered arrangements.