48 CFR § 1804.170 - 1804.170 Contract effective date.

---
identifier: "/us/cfr/t48/s1804.170"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "48 CFR § 1804.170 - 1804.170   Contract effective date."
title_number: 48
title_name: "Federal Acquisition Regulations System"
section_number: "1804.170"
section_name: "1804.170   Contract effective date."
chapter_number: 18
chapter_name: "NATIONAL AERONAUTICS AND SPACE ADMINISTRATION"
subchapter_number: "A"
subchapter_name: "GENERAL"
part_number: "1804"
part_name: "ADMINISTRATIVE MATTERS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "51 U.S.C. 20113(a) and 48 CFR chapter 1."
regulatory_source: "61 FR 40539, Aug. 5, 1996, unless otherwise noted."
cfr_part: "1804"
---


# 1804.170 1804.170   Contract effective date.

“Contract effective date” means the date agreed upon by the parties for beginning the period of performance under the contract. In no case shall the effective date precede the date on which the contracting officer or designated higher approval authority signs the document. Costs incurred before the contract effective date are unallowable unless they qualify as precontract costs (see FAR 31.205-32) and the clause prescribed at 1831.205-70 is used.

[83 FR 28386, June 19, 2018]