FAR and DFARS › FAR Part 31: Contract Cost Principles and Procedures › Subpart 31.1
FAR 31.109 Advance agreements.
The codified text (eCFR, as of 2026-10-02). Under the Revolutionary FAR Overhaul ↗, agencies follow class deviations with new text for many parts while the formal rules go through the Federal Register: check the solicitation and your contract's clauses, which rule.
In plain English
This section explains that contractors and contracting officers can negotiate advance agreements about how special or unusual costs will be treated, to avoid later disputes over whether those costs are reasonable, allocable, or allowable. An advance agreement is optional, and not having one does not by itself change how a cost is treated. Advance agreements must be in writing, signed by both parties, and incorporated into contracts.
Applies to: Contractors and contracting officers dealing with special or unusual costs under FAR Part 31 cost principles
What it requires
- Negotiate advance agreements in writing, executed by both contracting parties
- Incorporate advance agreements into applicable current and future contracts
- Include a statement of the agreement's applicability and duration
- Negotiate advance agreements before incurring the costs involved, when possible
Key terms: advance agreement · allowability · reasonableness · allocability · statistical sampling methodologies
Written by AI from this section's text. A guide, not legal advice: the text below rules.
The text
(a) The extent of allowability of the costs covered in this part applies broadly to many accounting systems in varying contract situations. Thus, the reasonableness, the allocability and the allowability under the specific cost principles at subparts 31.2, 31.3, 31.6, and 31.7 of certain costs may be difficult to determine. To avoid possible subsequent disallowance or dispute based on unreasonableness, unallocability or unallowability under the specific cost principles at subparts 31.2, 31.3, 31.6, and 31.7, contracting officers and contractors should seek advance agreement on the treatment of special or unusual costs and on statistical sampling methodologies at 31.201-6(c). However, an advance agreement is not an absolute requirement and the absence of an advance agreement on any cost will not, in itself, affect the reasonableness, allocability or the allowability under the specific cost principles at subparts 31.2, 31.3, 31.6, and 31.7 of that cost.
(b) Advance agreements may be negotiated either before or during a contract but should be negotiated before incurrence of the costs involved. The agreements must be in writing, executed by both contracting parties, and incorporated into applicable current and future contracts. An advance agreement shall contain a statement of its applicability and duration.
(c) The contracting officer is not authorized by this 31.109 to agree to a treatment of costs inconsistent with this part. For example, an advance agreement may not provide that, notwithstanding 31.205-20, interest is allowable.
(d) Advance agreements may be negotiated with a particular contractor for a single contract, a group of contracts, or all the contracts of a contracting office, an agency, or several agencies.
(e) The cognizant administrative contracting officer (ACO), or other contracting officer established in part 42, shall negotiate advance agreements except that an advance agreement affecting only one contract, or class of contracts from a single contracting office, shall be negotiated by a contracting officer in the contracting office, or an ACO when delegated by the contracting officer. When the negotiation authority is delegated, the ACO shall coordinate the proposed agreement with the contracting officer before executing the advance agreement.
(f) Before negotiating an advance agreement, the Government negotiator shall—
(1) Determine if other contracting offices inside the agency or in other agencies have a significant unliquidated dollar balance in contracts with the same contractor;
(2) Inform any such office or agency of the matters under consideration for negotiation; and
(3) As appropriate, invite the office or agency and the responsible audit agency to participate in prenegotiation discussions and/or in the subsequent negotiations.
(g) Upon completion of the negotiation, the sponsor shall prepare and distribute to other interested agencies and offices, including the audit agency, copies of the executed agreement and a memorandum providing the information specified in 15.406-3, as applicable.
(h) Examples for which advance agreements may be particularly important are—
(1) Compensation for personal services, including but not limited to allowances for off-site pay, incentive pay, location allowances, hardship pay, cost of living differential, and termination of defined benefit pension plans;
(2) Use charges for fully depreciated assets;
(3) Deferred maintenance costs;
(4) Precontract costs;
(5) Independent research and development and bid and proposal costs;
(6) Royalties and other costs for use of patents;
(7) Selling and distribution costs;
(8) Travel and relocation costs, as related to special or mass personnel movements, as related to travel via contractor-owned, -leased, or -chartered aircraft, or as related to maximum per diem rates;
(9) Costs of idle facilities and idle capacity;
(10) Severance pay to employees on support service contracts;
(11) Plant reconversion;
(12) Professional services (e.g., legal, accounting, and engineering);
(13) General and administrative costs (e.g., corporate, division, or branch allocations) attributable to the general management, supervision, and conduct of the contractor's business as a whole. These costs are particularly significant in construction, job-site, architect-engineer, facilities, and Government-owned contractor operated (GOCO) plant contracts (see 31.203(h));
(14) Costs of construction plant and equipment (see 31.105(d)).
(15) Costs of public relations and advertising; and
(16) Statistical sampling methods (see 31.201-6(c)(4).
Sections it refers to
Sections that refer to it
- 27.202-3 Adjustment of royalties.
- 31.105 Construction and architect-engineer contracts.
- 31.201-6 Accounting for unallowable costs.
- 31.205-6 Compensation for personal services.
- 31.205-11 Depreciation.
- 31.205-32 Precontract costs.
- 31.205-37 Royalties and other costs for use of patents.
- 31.205-46 Travel costs.
- 32.503-2 Supervision of progress payments.
- 36.606 Negotiations.
- 42.302 Contract administration functions.
- 219.7103-2 Contracting officer responsibilities.
← 31.108 Contracts with nonprofit organizations. · 31.110 Indirect cost rate certification and penalties on unallowable costs. →
Rule changes for FAR Part 31
- Federal Acquisition Regulation; Technical Amendments ↗ · final rule 2024-04-22 · effective 2024-05-22
Source: eCFR, 48 CFR chapters 1 and 2 (GPO GovInfo bulk data) ↗. Plain words for the terms: glossary.