FAR 16.603-2—Application.
Plain-English Summary
FAR 16.603-2 explains when and how a letter contract may be used, and what must be included to control risk before a definitive contract is finalized. It covers the basic conditions for using a letter contract, the requirement that it be as complete and definite as possible, the need for an overall price ceiling when the award is based on price competition, the required definitization schedule under FAR 52.216-25, the timing rules for submission of proposals, certified cost or pricing data and other required data, negotiation start, and target definitization date, the 180-day/40-percent rule and limited extension authority, the procedure if the parties cannot agree on price or fee, the Government’s maximum liability under FAR 52.216-24, and the requirement to assign a priority rating when appropriate under FAR 11.604. In practice, this section is about balancing urgency with control: it lets work start immediately when the Government cannot wait for a fully negotiated contract, but it also imposes strict limits so the Government does not lose leverage, exceed funding, or delay definitization indefinitely. For contractors, it means they may be authorized to begin performance before final terms are settled, but they must still prepare pricing and supporting data quickly and continue work even if negotiations stall. For contracting officers, it creates a disciplined framework for managing risk, funding exposure, and schedule pressure while moving to a definitive contract as soon as practicable.
Key Rules
Use only for urgent need
A letter contract is appropriate only when the Government needs a binding commitment immediately and there is not enough time to negotiate a definitive contract. Even then, the letter contract should be as complete and definite as the circumstances allow.
Set a price ceiling when competed
If the letter contract award is based on price competition, the contracting officer must include an overall price ceiling. This limits the Government’s exposure while the final contract is being negotiated.
Include a definitization schedule
Each letter contract must contain a negotiated definitization schedule under FAR 52.216-25. The schedule must identify when the contractor will submit its proposal and supporting data, when negotiations will begin, and the target date for definitization.
Meet the 180-day or 40-percent limit
The schedule must provide for definitization within 180 days after the letter contract date or before completion of 40 percent of the work, whichever occurs first. In extreme cases, the contracting officer may authorize more time under agency procedures.
Continue work if agreement fails
If the parties cannot agree on price or fee after reasonable efforts, the contractor must keep performing. With approval from the head of the contracting activity, the contracting officer may determine a reasonable price or fee under FAR subpart 15.4 and part 31, subject to dispute procedures.
Limit Government liability
The maximum liability inserted in FAR 52.216-24 must equal the estimated amount needed to fund the contractor before definitization. It may not exceed 50 percent of the estimated cost of the definitive contract unless the approving official for the letter contract authorizes a higher amount in advance.
Assign priority when appropriate
The contracting officer must assign a priority rating to the letter contract when it is appropriate under FAR 11.604. This ties the urgent requirement to the Government’s priority rating system for performance and supply support.
Responsibilities
Contracting Officer
Determine whether the urgency and inability to finalize terms justify a letter contract; make the letter contract as complete and definite as possible; include an overall price ceiling when required; negotiate and include the definitization schedule; ensure the schedule meets the 180-day/40-percent rule unless an extreme-case extension is authorized; set the Government’s maximum liability consistent with funding needs and the 50-percent limit; assign a priority rating when appropriate; and, if negotiations fail, pursue definitization procedures and any reasonable-price/fee determination with required approvals.
Contractor
Begin work under the binding letter contract; submit the price proposal, certified cost or pricing data, and any other required data by the scheduled date; provide make-or-buy and subcontracting plans if required; participate in negotiations starting on the scheduled date; continue performance even if agreement on price or fee is not reached; and support definitization by providing timely, accurate pricing and cost information.
Head of the Contracting Activity
Approve a contracting officer’s determination of a reasonable price or fee when the parties cannot agree after exhausting reasonable efforts, as required by the clause and this section.
Agency
Establish procedures for any extreme-case extension beyond the normal definitization period and for any other internal controls governing use of letter contracts and liability limits.
Official Authorizing the Letter Contract
Approve in advance any Government liability amount above 50 percent of the estimated cost of the definitive contract, when such a higher amount is needed.
Practical Implications
Letter contracts are a speed tool, not a shortcut around contract discipline. They let work start quickly, but they also require careful controls on scope, funding, and timing so the Government does not end up with an open-ended commitment.
The biggest operational risk is delay in definitization. Missing proposal, data, or negotiation milestones can leave the parties working under temporary terms longer than intended and can create pricing and funding disputes.
Contracting officers should watch the liability cap closely. If the cap is too low, the contractor may run out of funded authority before definitization; if it is too high, the Government may take on unnecessary exposure.
Contractors should treat the letter contract as a real contract, not a placeholder. They must be ready to submit pricing support quickly and keep performing even if final price or fee is still unresolved.
Priority ratings, when applicable, can affect supply chain and performance sequencing, so they should be assigned deliberately and only when supported by FAR 11.604.
Official Regulatory Text
(a) A letter contract may be used when (1) the Government’s interests demand that the contractor be given a binding commitment so that work can start immediately and (2) negotiating a definitive contract is not possible in sufficient time to meet the requirement. However, a letter contract should be as complete and definite as feasible under the circumstances. (b) When a letter contract award is based on price competition, the contracting officer shall include an overall price ceiling in the letter contract. (c) Each letter contract shall, as required by the clause at 52.216-25 , Contract Definitization, contain a negotiated definitization schedule including (1) dates for submission of the contractor's price proposal, required certified cost or pricing data and data other than certified cost or pricing data; and, if required, make-or-buy and subcontracting plans, (2) a date for the start of negotiations, and (3) a target date for definitization, which shall be the earliest practicable date for definitization. The schedule will provide for definitization of the contract within 180 days after the date of the letter contract or before completion of 40 percent of the work to be performed, whichever occurs first. However, the contracting officer may, in extreme cases and according to agency procedures, authorize an additional period. If, after exhausting all reasonable efforts, the contracting officer and the contractor cannot negotiate a definitive contract because of failure to reach agreement as to price or fee, the clause at 52.216-25 requires the contractor to proceed with the work and provides that the contracting officer may, with the approval of the head of the contracting activity, determine a reasonable price or fee in accordance with subpart 15.4 and part 31 , subject to appeal as provided in the Disputes clause. (d) The maximum liability of the Government inserted in the clause at 52.216-24 , Limitation of Government Liability, shall be the estimated amount necessary to cover the contractor’s requirements for funds before definitization. However, it shall not exceed 50 percent of the estimated cost of the definitive contract unless approved in advance by the official that authorized the letter contract. (e) The contracting officer shall assign a priority rating to the letter contract if it is appropriate under 11.604 .