---
kind: "section"
citation: "48 C.F.R. § 43.103"
title: "48"
number: "43.103"
heading: "Types of contract modifications."
url: "https://uscodex.org/cfr/48/43.103"
---

# §43.103. Types of contract modifications.


Contract modifications are of the following types:

- (a) **Bilateral.** A bilateral modification (supplemental agreement) is a contract modification that is signed by the contractor and the contracting officer. Bilateral modifications are used to—
  - (1) Make negotiated equitable adjustments resulting from the issuance of a change order;
  - (2) Definitize letter contracts; and
  - (3) **Reflect other agreements of the parties modifying the terms of contracts.**
- (b) **Unilateral.** A unilateral modification is a contract modification that is signed only by the contracting officer. Unilateral modifications are used, for example, to—
  - (1) Make administrative changes;
  - (2) Issue change orders;
  - (3) Make changes authorized by clauses other than a changes clause (e.g., Property clause, Options clause, or Suspension of Work clause); and
  - (4) **Issue termination notices.**

## Notes

### Amendments

[48 FR 42386, Sept. 19, 1983, as amended at 66 FR 2133, Jan. 10, 2001]

### Authority

Authority: 41 U.S.C. 1121(b); 40 U.S.C. 121(c); 10 U.S.C. chapter 4 and 10 U.S.C. chapter 137 legacy provisions (see 10 U.S.C. 3016); and 51 U.S.C. 20113.

### Source

Source: 48 FR 42386, Sept. 19, 1983, unless otherwise noted.

### Amendments

[48 FR 42386, Sept. 19, 1983, as amended at 66 FR 2133, Jan. 10, 2001]