How to Write a Contract Amendment

A contract amendment changes specific terms of an agreement that is already signed, without replacing the whole document. Use it to update a price, extend a deadline, change scope, or correct a clause. Informal emails that "agree to change it" are easy to lose and hard to prove; a short signed amendment is not.

Our free contract amendment template is built for exactly that.

Amendment vs addendum vs new contract

• Amendment — changes existing terms.
• Addendum — adds new terms or attachments without rewriting what is already there.
• New contract — replaces the old one entirely.

Use an amendment when only part of a live agreement needs to change.

1. Identify the original contract

Give the original title, the date it was signed, and the parties. If it has a contract number, include that. Attaching the original as an exhibit removes any doubt about what you are changing.

2. State the exact changes

Quote or point to the clause you are replacing, then write the new wording. "Section 3 (Fee) is deleted and replaced with: The fee is $4,000, payable on 1 November 2026." Vague notes like "we agreed to more time" do not belong in an amendment.

3. Keep the rest in force

Add a sentence that all other terms of the original contract remain unchanged. If the amendment and the original ever conflict, say the amendment controls for the changed parts only.

4. Effective date and signatures

State when the changes take effect. Every original party should sign — an amendment signed by only one side is not an amendment. Electronic signatures work the same way they did on the original. For the elements that make any of this binding, see what makes a contract legally binding.

Disclaimer: This article is for general informational purposes only and is not legal advice. Some contracts require amendments to follow a specific form — check the original.