FAR and DFARS › FAR Part 4: Administrative and Information Matters › Subpart 4.10
FAR 4.1006 Modifications.
The codified text (eCFR, as of 2026-10-02). Under the Revolutionary FAR Overhaul ↗, agencies follow class deviations with new text for many parts while the formal rules go through the Federal Register: check the solicitation and your contract's clauses, which rule.
The text
(a) When a new item (such as an increased quantity) is added to the procurement instrument, assign a new line item number.
(b) If the modification relates to existing line items, the modification shall refer to those items.
← 4.1005-2 Exceptions. · 4.1007 Solicitation alternative line item proposal. →
Rule changes for FAR Part 4
- Federal Acquisition Regulation: Revolutionary Federal Acquisition Regulation Overhaul Parts 1, 2, 4, 33, 39, 40, and 53 ↗ · proposed 2026-06-23 · comments due 2026-07-23
- Federal Acquisition Regulation: Inflation Adjustment of Acquisition-Related Thresholds ↗ · final rule 2025-08-27 · effective 2025-10-01
- Federal Acquisition Regulation: Small Business Innovation Research and Technology Transfer Programs ↗ · proposed 2025-06-12
- Federal Acquisition Regulation: Controlled Unclassified Information ↗ · proposed 2025-01-15 · comments due 2025-03-17
- Federal Acquisition Regulation: Disclosure of Greenhouse Gas Emissions and Climate-Related Financial Risk ↗ · proposed 2025-01-13
- Federal Acquisition Regulation: Rerepresentation of Size and Socioeconomic Status ↗ · final rule 2025-01-03 · effective 2025-01-17
- Federal Acquisition Regulation: Prohibition on Unmanned Aircraft Systems From Covered Foreign Entities ↗ · final rule 2024-12-30
- Federal Acquisition Regulation: Inflation Adjustment of Acquisition-Related Thresholds ↗ · proposed 2024-11-29 · comments due 2025-01-28
Source: eCFR, 48 CFR chapters 1 and 2 (GPO GovInfo bulk data) ↗. Plain words for the terms: glossary.