Contract Modification

A contract modification is any written alteration to the terms and conditions of an existing government contract, including scope, price, period of performance, or incorporated clauses, executed by a warranted contracting officer.

What is a Contract Modification?

Contract modifications are governed by FAR 43.103 and are the formal mechanism by which changes to government contracts are implemented. Every change to a contract, no matter how small, must be executed through a written modification signed by the contracting officer (and often the contractor).

Contract modifications fall into two categories:

Bilateral modifications, signed by both the contracting officer and the contractor. Used for: negotiating and agreeing on definitized contract actions, incorporating changes agreed upon by both parties, settling claims or disputes, and making administrative changes that do not affect contract obligations.

Unilateral modifications, signed only by the contracting officer. Used for: issuing change orders under the Changes clause, exercising options, making administrative changes (such as updating contracting officer information), and issuing termination notices.

A modification is assigned a sequential alphanumeric number (P00001, P00002, etc., with P indicating post-award modification) that becomes part of the contract's permanent identification. The modification is incorporated into the contract file and becomes part of the complete contract. Contractors must reference the applicable modification number on all invoices and correspondence related to changed work.

Common types of contract modifications:

• Option exercise: government exercises an option period
• Change order: government directs a change to the scope of work
• Definitization: conversion of a letter contract or UCA to a definitive agreement
• Equitable adjustment: price and/or schedule adjustment for changed conditions
• Deobligation/obligation: increase or decrease in funded amount
• Administrative: update contracting officer, COR, payment information

Why Contract Modifications matter for government contractors

Contract modifications are how the government gets more work done, adjusts scope to meet evolving needs, and resolves disputes, and how contractors protect their financial interests. When the government directs additional work outside the contract scope, the contractor's first action should be requesting a modification before beginning the work. Performing additional work without a modification is performing at risk, the government may refuse to pay for work not authorized by a signed modification. Tracking all modifications carefully, their scope, their price impact, and their schedule impact, is fundamental contract administration. Modification-by-modification tracking reveals cost trends, scope growth, and funding adequacy issues before they become crises.

Example

A services contract is modified seven times during its three-year life: Mod P00001 exercises Option Year 1; Mod P00002 directs additional data analysis (unilateral change order); Mod P00003 settles the equitable adjustment for the Mod P00002 work (bilateral, increasing price by $95,000); Mod P00004 updates the COR name and contact information (administrative); Mod P00005 exercises Option Year 2; Mod P00006 adds a new CLIN for specialized reporting (bilateral, adds $180,000); Mod P00007 obliges additional funds for the remaining performance period. Each modification becomes part of the contract, and the "complete contract" is the original award plus all seven modifications.

Frequently Asked Questions

Can any government employee issue a contract modification?

No. Only a warranted contracting officer, an individual with a Certificate of Appointment (the "warrant") authorizing contract actions up to a specified dollar limit, can sign a contract modification. CORs, program managers, and other agency officials cannot modify contracts. Modifications signed by unauthorized individuals are void.

What is the difference between a modification and a novation?

A modification changes the terms of an existing contract while the same parties remain bound. A novation agreement substitutes a new contractor for the original contractor (for example, when the original contractor is acquired by another company). Novations require a three-party agreement.

How do I request a contract modification as a contractor?

The formal mechanism is a Request for Equitable Adjustment (REA) or a change order request, a written communication to the contracting officer documenting the changed condition, its impact on cost and schedule, and the requested adjustment. The contracting officer reviews and, if agreed, executes a bilateral modification. If not agreed, the contractor may claim under the Contract Disputes Act.

Is there a dollar limit on how much a modification can increase the original contract value?

No specific regulatory dollar limit applies, but very large increases raise competition concerns. A modification that significantly increases the scope, beyond what was reasonably anticipated at award, may be an out-of-scope change that should be competed rather than modified. This is a protest vulnerability: competitors can challenge modifications as de facto sole-source awards of new work.