Contract Modification

A contract modification is any written change in the terms of a contract. This is the definition in the U.S. Federal Acquisition Regulation, which is an authoritative allied-government source for defence and public procurement (FAR 2.101). The change is made in writing and applies to a contract that already exists.

A modification can change contractual requirements, price, delivery, funding, administrative details, options or other terms, within the authority of the contract and the applicable procurement rules. In Canadian federal procurement, the usual term for the same action is a contract amendment, and both terms appear in contract-management guidance on CanadaBuys.

Bilateral and unilateral modifications under the FAR

The FAR recognizes two principal forms of contract modification in FAR 43.103.

• Bilateral modification: a supplemental agreement signed by both the contractor and the contracting officer.
• Unilateral modification: a modification signed only by the contracting officer. It is used for administrative changes, change orders, authorized option changes and termination notices.

The distinction tells a supplier whether its signature is part of the change. A bilateral modification needs the supplier's agreement. A unilateral modification is issued under authority the contract already grants.

Related terms: change orders, supplemental agreements and pricing

Several terms sit close to contract modification. A change order is a written direction that changes work under a contract. It is often issued unilaterally where the contract permits it. A supplemental agreement is another name for a bilateral modification. The U.S. Defense Federal Acquisition Regulation Supplement also provides for pricing of contract modifications in solicitations and contracts where a fixed-price contract is anticipated.

How CanadaBuys guides contract amendments

The CanadaBuys Buyer's Guide has a dedicated "Modify a contract" section. It covers amending contracts, revising standing offers and supply arrangements, managing design changes or deviations, and exercising contract options (Modify a contract).

The administrative guidance for implementing contract modifications tells buyers to:

• follow the original contract format;
• identify all modifications;
• consolidate multiple changes into one amendment where possible; and
• distribute amendments in the same manner as the original contract.

These steps preserve transparency and keep contract records accurate.

Treasury Board approval when a contract is amended

The Treasury Board of Canada Secretariat's Directive on the Management of Procurement requires contracting authorities to seek Treasury Board approval before entering into or amending a contract when the estimated value exceeds the applicable approval limits. That estimate includes expected amendments and follow-on contracts. The directive also addresses amendments when deliverables or costs change after advance approval, and amendments to contracts issued against standing offers or supply arrangements.

What contract modifications mean for a supplier bidding on Canadian public contracts

A change to a federal contract should arrive as a formal written amendment, not an informal instruction. When one arrives, a supplier should take these steps:

• Check which contractual terms the amendment affects, such as price, scope, delivery, design, options, funding or administrative requirements.
• Determine whether it changes the supplier's obligations, schedule, technical requirements or compliance burden.
• Sign or otherwise formally accept the amendment where it requires the supplier's agreement.
• Where the contract authorizes a unilateral change, follow the contract's procedure and any notice, claim or pricing requirements.

Bid teams should also read the amendment provisions of a solicitation before submitting. Expected amendments count toward the value used for Treasury Board approval limits, so growth in a contract's scope is a planned part of how federal buyers manage approvals.