What to check in a contract amendment before the parties sign
A contract amendment changes something in an agreement that already exists. That means your review has two layers: checking the amendment itself, and checking how it relates to the original document.
The most common mistake is reviewing an amendment as if it were a standalone contract — looking only at what it says on its own terms. That isn't enough. An amendment is only valid in context. If it doesn't correctly identify what it's amending, or if the change conflicts with something that wasn't touched, the problem won't be obvious until it matters.
Check that the amendment correctly identifies the original
Before you look at the substance, confirm that the amendment identifies the original contract clearly:
- The title or type of the original agreement.
- The date it was entered into.
- The parties as named in the original, with their identity numbers or company registration references if the original included them, in the same order.
If any of these details don't match the original, you have an identification problem. That kind of error can be difficult to correct after the amendment is signed.
Check the parties
The parties to the amendment must be exactly the parties to the original contract — no more, no fewer. If a party has assigned their position since the original was signed, or if a new party is being added, an amendment isn't the right instrument. It needs a novation, a deed of assignment, or whichever mechanism applies to that change.
If a party is signing under a power of attorney or as a company officer, check that the authority is current and covers this type of variation — not just the original transaction.
Review the clauses being changed
The amendment should make it clear which clauses it replaces or modifies, and which remain unchanged. For every clause the amendment touches, go back to the original and read that clause in full.
Things that go wrong here:
- The amendment modifies a clause that was already amended by an earlier variation. In that case the operative text is the last amendment, not the original contract.
- The change creates a conflict with a clause that isn't touched. For example, extending a completion deadline without adjusting the linked late-completion provisions.
- The replacement text doesn't match what the original clause actually says — suggesting the amendment was drafted from memory or from a different version of the document.
If earlier amendments exist, reconstruct the current state of each affected clause before reviewing the new one.
Check any figures
If the amendment changes financial terms — the price, payment schedule, penalty rates, interest provisions — check that the new figures are consistent with each other and with the clauses that haven't changed.
If the original deed fixed a total price and the amendment adjusts a component, confirm that the revised total follows from the numbers as written. Don't assume the arithmetic is right: check it against each clause that states a figure.
Confirm the date and sequence
An amendment must be dated after the document it amends. An amendment dated before the original raises questions that have no satisfactory answer.
If there have been earlier amendments, the sequence matters. Each amendment operates on the contract as it stood after all previous amendments, not on the original text. Before treating the current amendment as final, confirm it isn't resting on a version of a clause that was already superseded by an earlier variation.
Signatures and authority
Apply the same review you would to any deed: full name and identity document number for each party, documents that are current and valid, and — where someone is signing under a power of attorney or company authority — confirmation that the authority is current, in writing, and covers this type of variation.
Short documents invite less scrutiny. A one-paragraph amendment to a long contract can undo everything that was carefully negotiated, and the brevity makes errors easy to miss. The pre-signing review matters just as much as it does on the original.
If you'd like support with document review and verification in your practice, VerifyAct has tools built for that.