FAR 43.201—General.
Plain-English Summary
FAR 43.201 explains the basic mechanics of unilateral contract changes under the Changes clause. It covers when a contracting officer may issue a change order, the normal use of Standard Form 30 (SF 30) to document the modification, the contractor’s duty to keep performing the contract as changed, the special limits that apply to cost-reimbursement and incrementally funded contracts under the Limitation of Cost or Limitation of Funds clauses, and the narrow circumstances in which a change order may be issued electronically without first using an SF 30. In practice, this section matters because it tells both sides how the Government can direct certain changes without bilateral agreement, while also protecting contractors from being forced to perform beyond funding limits in the covered contract types. It also emphasizes that even when speed is necessary, the Government must promptly convert an electronic direction into the formal written modification record. For contracting officers, this is the operational starting point for issuing change orders; for contractors, it is the baseline rule for when performance must continue and when funding limits may stop further work.
Key Rules
Changes clause controls
Most Government contracts include a Changes clause that allows the contracting officer to make unilateral changes only in the areas and to the extent the clause permits. The change must remain within the general scope of the contract.
SF 30 is the normal vehicle
Change orders are ordinarily issued in writing on Standard Form 30, Amendment of Solicitation/Modification of Contract, unless another procedure is specifically authorized. The SF 30 is the standard formal record of the modification.
Contractor must keep performing
When a valid change order is issued, the contractor must continue performance of the contract as changed. The contractor cannot refuse performance simply because the change was unilateral.
Funding limits remain a stop point
For cost-reimbursement or incrementally funded contracts, the contractor is not required to continue performance or incur costs beyond the limits set by the Limitation of Cost or Limitation of Funds clause. Those clauses override any expectation of unlimited continued performance.
Electronic change orders allowed in emergencies
In unusual or urgent circumstances, the contracting officer may issue a change order electronically without first using an SF 30, but the electronic message must contain substantially the same information as the SF 30 and the formal SF 30 must be issued immediately afterward.
Responsibilities
Contracting Officer
Determine whether the contract contains a Changes clause and whether the proposed action is within the general scope of the contract. Issue unilateral change orders in writing on SF 30 unless an authorized exception applies, and if an electronic change is used in urgent circumstances, promptly follow it with the SF 30.
Contractor
Continue performance of the contract as changed when a valid change order is issued. For cost-reimbursement and incrementally funded contracts, stop work or avoid incurring additional costs once the applicable funding limit in the Limitation of Cost or Limitation of Funds clause is reached.
Agency/Contracting Activity
Ensure internal procedures support proper use of SF 30, electronic communications in urgent cases, and documentation of unilateral changes. Maintain compliance controls so changes stay within the contract’s scope and are properly recorded.
Practical Implications
A contractor generally cannot treat a unilateral change as optional if it is within the Changes clause and within scope; performance must continue while any entitlement issues are resolved separately.
The funding clauses matter a great deal on cost-reimbursement and incrementally funded contracts: once the stated limit is reached, the contractor is not obligated to keep working or spending money.
Electronic directions can be used in emergencies, but they are not a substitute for documentation; the SF 30 still has to follow immediately, so contractors should preserve the electronic record and confirm receipt.
A common pitfall is assuming every Government direction is a valid change order. If the direction is outside the Changes clause or outside the contract’s general scope, it may require a different contractual action.
Contracting officers should be careful to distinguish between urgent operational needs and proper modification authority, because using the wrong process can create disputes over enforceability, scope, and payment.
Official Regulatory Text
(a) Generally, Government contracts contain a changes clause that permits the contracting officer to make unilateral changes, in designated areas, within the general scope of the contract. These are accomplished by issuing written change orders on Standard Form 30 , Amendment of Solicitation/Modification of Contract ( SF 30 ), unless otherwise provided (see 43.301 ). (b) The contractor must continue performance of the contract as changed, except that in cost-reimbursement or incrementally funded contracts the contractor is not obligated to continue performance or incur costs beyond the limits established in the Limitation of Cost or Limitation of Funds clause (see 32.706-2 ). (c) The contracting officer may issue a change order by electronic means without a SF 30 under unusual or urgent circumstances, provided that the message contains substantially the information required by the SF 30 and immediate action is taken to issue the SF 30 .