FAR Change Order Rules Guide – The Federal Acquisition Regulation (FAR) governs how the U.S. federal government buys goods and services. Change orders represent one of the most common—and often contentious—elements of federal contracting. This comprehensive FAR change order rules guide explains the current rules under FAR Part 43 (as updated under FAC 2026-01, effective March 13, 2026), including the Revolutionary FAR Overhaul restructuring. It is designed for U.S. government contractors, contracting officers, and acquisition professionals operating under federal contracts.
Understanding FAR change order rules helps contractors protect their rights to equitable adjustments, avoid disputes, and maintain compliance while continuing performance.
What Are FAR Change Orders?
FAR change orders are unilateral written directives issued by the contracting officer to modify a contract within its general scope. They allow the government to make changes in designated areas—such as specifications, delivery schedules, or methods of performance—without contractor consent, provided the changes stay within the contract’s original scope.
Change orders differ from bilateral modifications (supplemental agreements negotiated by both parties) and administrative changes (which do not affect substantive rights). They are issued under the contract’s Changes clause and documented primarily on Standard Form 30 (SF 30).
Key point: Only the contracting officer (or a properly delegated administrative contracting officer) can issue a valid change order. Government personnel without authority cannot direct changes.
Key FAR Provisions Governing Change Orders (FAR Part 43)
FAR Part 43 (Contract Modifications) provides the overarching framework. Post-2026 overhaul, the structure separates general rules (Subpart 43.2) from change orders (Subpart 43.3), but the substantive requirements remain consistent for uniformity across agencies.
- 43.301 General: Contracts include a Changes clause allowing unilateral modifications within scope. Change orders use SF 30 (or electronic equivalent in urgent cases with prompt follow-up).
- 43.302 Authority: Issued exclusively by the contracting officer (or delegated ACO per FAR 42.202(c)).
- 43.303 Change Order Accounting: Requires segregation of costs for changed work when the clause at 52.243-6 is included.
- 43.304 Administration: Details documentation, definitization of equitable adjustments, and use of releases in supplemental agreements.
These rules apply to all contract types, including supplies, services, construction, and research & development.
Authority to Issue Change Orders
Only contracting officers acting within their warrant authority may issue change orders. Administrative contracting officers may receive delegation under FAR 42.202(c), but the prime responsibility stays with the contracting officer.
Contractors should always verify the signer’s authority. Unauthorized directions from technical representatives or program officials do not constitute a valid change order unless ratified in writing by the contracting officer.
Contractor Obligations Upon Receiving a Change Order
Contractors must continue performance as changed, except in cost-reimbursement or incrementally funded contracts where the Limitation of Cost or Limitation of Funds clause (FAR 32.706-2) limits obligations.
Failure to perform can result in default termination. However, contractors retain the right to seek an equitable adjustment for any increase in cost or time caused by the change.
Types of Changes Allowed Under FAR Changes Clauses
The specific Changes clause incorporated into the contract determines allowable changes. Common clauses include:
- FAR 52.243-1 (Changes—Fixed-Price): For fixed-price supply contracts (with alternates for services, architect-engineer, etc.).
- FAR 52.243-2 (Changes—Cost-Reimbursement): For cost-reimbursement contracts.
- FAR 52.243-3 (Changes—Time-and-Materials or Labor-Hours).
- FAR 52.243-4 (Changes): For construction contracts exceeding the simplified acquisition threshold.
- FAR 52.243-5 (Changes and Changed Conditions): For lower-value construction contracts.
Allowable changes typically include: drawings, designs, specifications, method of shipment, place of delivery, or (for construction) site conditions. Changes outside the general scope require a new contract or bilateral modification.
Documentation and Forms for Change Orders
Change orders are issued on SF 30 (Amendment of Solicitation/Modification of Contract). In urgent situations, electronic means are permitted if the message includes required SF 30 information and a formal SF 30 follows immediately.
When not forward-priced, two documents are required:
- The initial unilateral change order.
- A subsequent bilateral supplemental agreement definitizing the equitable adjustment.
Forward-priced changes may use only a supplemental agreement.
Forward-Priced vs. Unpriced Change Orders and Equitable Adjustments
- Forward-priced: Price and/or delivery terms are negotiated and agreed before issuance (preferred when feasible).
- Unpriced: Issued unilaterally; equitable adjustment negotiated afterward.
An equitable adjustment compensates for any increase (or decrease) in cost or time. The contracting officer must make a fair and reasonable adjustment based on the contractor’s costs, using cost analysis where appropriate (FAR 15.404-1).
Contractors must submit a timely proposal with supporting data. Agencies track definitization timelines, especially for construction.
Definitization Process and Timelines
Contracting officers must negotiate equitable adjustments “in the shortest practicable time.” Agencies maintain data on definitization speed for construction per FAR 36.211(b).
To prevent future disputes, supplemental agreements should include a Contractor’s Statement of Release covering all elements of the adjustment (with any explicit exceptions reserved by the contractor).
Suspense systems help ensure prompt definitization of unpriced change orders.
Change Order Accounting Requirements
When the optional FAR 52.243-6 Change Order Accounting clause is included (common in complex supply, R&D, or construction contracts), contractors must segregate costs into:
- Nonrecurring costs (engineering, obsolete/reperformed work).
- Costs of added distinct work (new subcontracts, prototypes).
- Recurring costs (labor, materials).
Contracting officers should notify prospective offerors early if this clause will apply.
Notification of Changes Clause (FAR 52.243-7)
The optional clause at FAR 52.243-7 requires contractors to notify the government promptly (within a negotiated number of days) of any government conduct they believe constitutes a change. This protects contractors from constructive changes and allows the government to evaluate, confirm, or countermand the alleged change.
It is primarily used in negotiated R&D or major weapon system contracts.
Common Pitfalls and Best Practices for US Contractors
- Pitfall: Performing changed work without written direction or failing to notify of constructive changes.
- Best Practice: Document everything. Submit written notice immediately for any suspected change. Track costs separately from day one.
- Pitfall: Signing supplemental agreements without reserving rights for unknown impacts.
- Best Practice: Use explicit reservation language or the release exception in FAR 43.304(c)(2). Consult legal counsel before finalizing definitization.
- Pitfall: Delaying equitable adjustment proposals.
- Best Practice: Submit a complete proposal with cost data as soon as possible. Request field pricing assistance if needed.
- Maintain strong accounting systems compliant with the Change Order Accounting clause when required.
Federal contractors (especially DoD, civilian agencies, and construction firms) should review agency-specific supplements (e.g., DFARS for defense) and consult the latest acquisition.gov resources.
Disputes and Equitable Adjustments Under FAR Change Orders
If the parties cannot agree on an equitable adjustment, the contracting officer may issue a unilateral determination. Contractors may then pursue a claim under the Disputes clause (FAR 52.233-1) via the agency board of contract appeals or U.S. Court of Federal Claims.
Timely notice and documentation are critical to preserving claim rights.
Conclusion: Mastering FAR Change Order Rules in 2026
FAR change order rules provide a structured yet flexible framework that balances government needs with contractor protections. By understanding current requirements under FAR Part 43 (Subpart 43.3), the applicable Changes clauses, documentation standards, and definitization processes, U.S. government contractors can minimize disputes, secure fair equitable adjustments, and maintain strong performance records.
For the most current text, always refer to acquisition.gov/far/part-43. Consult your contracting officer, agency supplements, or legal counsel for contract-specific application. Staying proactive with notifications, cost tracking, and timely proposals remains the best defense in federal contracting.