---
kind: "section"
citation: "48 C.F.R. § 43.101"
title: "48"
number: "43.101"
heading: "Definitions."
url: "https://uscodex.org/cfr/48/43.101"
---

# §43.101. Definitions.


As used in this part—

Administrative change means a unilateral (see 43.103(b)) contract change, in writing, that does not affect the substantive rights of the parties (e.g., a change in the paying office or the appropriation data).

Effective date means—

- (1) For a solicitation amendment, change order, or administrative change, the effective date shall be the issue date of the amendment, change order, or administrative change.
- (2) For a supplemental agreement, the effective date shall be the date agreed upon by the contracting parties.
- (3) For a modification issued as a confirming notice of termination for the convenience of the Government, the effective date of the confirming notice shall be the same as the effective date of the initial notice.
- (4) For a modification converting a termination for default to a termination for the convenience of the Government, the effective date shall be the same as the effective date of the termination for default.
- (5) For a modification confirming the termination contracting officer's previous letter determination of the amount due in settlement of a contract termination for convenience, the effective date shall be the same as the effective date of the previous letter determination.

## Notes

### Amendments

[90 FR 38208, Aug. 7, 2025]

### 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

[90 FR 38208, Aug. 7, 2025]