FAR 52.104—Procedures for modifying and completing provisions and clauses.
Plain-English Summary
FAR 52.104 explains how contracting officers may modify or complete solicitation provisions and contract clauses when the FAR specifically allows it. It covers five related topics: the general prohibition on unauthorized changes, examples of authorized modifications, how to show changes to provisions or clauses incorporated by reference, how to make changes to provisions or clauses included in full text, and how to complete blanks in either format. The section exists to preserve the integrity of standard FAR language while still allowing limited, controlled tailoring where the FAR permits it. In practice, it tells contracting officers exactly how to document edits so offerors and contractors can clearly see what was changed and where, reducing ambiguity, protest risk, and disputes over clause meaning. It also helps ensure that fill-ins and substitutions are made consistently and transparently, whether the clause is incorporated by reference or printed in full in the solicitation or contract.
Key Rules
Only authorized changes allowed
A contracting officer must not modify a provision or clause unless the FAR expressly authorizes that modification. This means the default rule is no editing unless the clause or provision itself gives permission to change specific words, dates, periods, or other terms.
Follow the FAR’s stated limits
When the FAR allows a modification, the contracting officer must stay within the exact limits given. For example, the FAR may permit a shorter time period within a stated range or allow substitution of a specified term such as changing 'Schedule' to 'task order'.
Show changes below title
For provisions or clauses incorporated by reference, any modification must be inserted directly below the title of the provision or clause. The change must identify the lowest necessary level—such as paragraph, sentence, or word—so it is obvious exactly what language is being altered.
Edit full-text clauses directly
For provisions or clauses included in full text, the contracting officer must make the change directly in the clause language, using only the substitutions or edits the FAR permits. The revised wording should appear in the clause itself rather than as a separate note.
Fill in blanks by format used
When a provision or clause contains blanks, the fill-in information must be placed in the blanks if the clause is in full text. If the clause is incorporated by reference, the fill-in information must be inserted directly below the title, again identifying the lowest necessary level to show what is being completed.
Responsibilities
Contracting Officer
Must ensure any modification or completion of a provision or clause is expressly authorized by the FAR, make changes only within the permitted scope, and present those changes in the required format depending on whether the clause is incorporated by reference or in full text.
Agency
Must use FAR-compliant clause and provision formats and support contracting officers in applying standardized language correctly, including ensuring solicitations and contracts clearly show authorized edits and fill-ins.
Contractor/Offeror
Must review modified or completed provisions and clauses as written in the solicitation or contract, understand that only authorized changes are valid, and rely on the displayed wording to determine obligations and risks.
Practical Implications
This section is mainly about clarity and control: if a clause is changed, the change must be clearly visible and legally authorized. That reduces confusion about what version of the clause applies and helps avoid disputes later.
A common pitfall is treating standard FAR language as if it can be freely edited for convenience. Unless the FAR specifically allows the change, the contracting officer should not alter the clause text.
Another frequent mistake is failing to show the exact location and level of the change when a clause is incorporated by reference. If the modification is not tied to the correct paragraph, sentence, or word, the record may be unclear or vulnerable to challenge.
For full-text clauses, the change should be made in the clause itself, not buried in a separate note or attachment. The goal is for the operative language to be immediately apparent to the reader.
For contractors, the practical takeaway is to read modified clauses carefully and verify whether the change is an authorized FAR deviation or a permitted fill-in/substitution. If the wording seems inconsistent with the standard clause, it may affect pricing, performance, or compliance obligations.
Official Regulatory Text
(a) The contracting officer must not modify provisions and clauses unless the FAR authorizes their modification. For example- (1) "The contracting officer may use a period shorter than 60 days (but not less than 30 days) in paragraph (x) of the clause"; or (2) "The contracting officer may substitute the words ‘task order’ for the word ‘Schedule’ wherever that word appears in the clause." (b) When modifying provisions or clauses incorporated by reference, insert the changed wording directly below the title of the provision or clause identifying to the lowest level necessary ( e.g., paragraph, sentence, word), to clearly indicate what is being modified. (c) When modifying provisions or clauses incorporated in full text, modify the language directly by substituting the changed wording as permitted. (d) When completing blanks in provisions or clauses incorporated by reference, insert the fill-in information directly below the title of the provision or clause identifying to the lowest level necessary to clearly indicate the blanks being filled in. (e) When completing blanks in provisions or clauses incorporated in full text, insert the fill-in information in the blanks of the provision or clause.