COT3 agreement (ACAS): definition and how it works

In plain terms

“COT3” is simply the name of the form ACAS uses to record a settlement that one of its conciliation officers has helped the parties reach. When an employee brings, or threatens to bring, a claim in the employment tribunal, the parties often negotiate through ACAS (the Advisory, Conciliation and Arbitration Service) rather than fight it out at a hearing. If they agree terms, usually a payment in exchange for the employee dropping the claim, the deal is written up on a COT3.

The legal significance is that section 203 of the Employment Rights Act 1996 makes most attempts to contract out of statutory employment rights void. A COT3 is one of the recognised exceptions: a settlement reached with the assistance of an ACAS conciliation officer is binding and enforceable even though the employee is giving up the right to sue.

This is where the comparison of a cot3 and settlement agreement matters. The two do the same essential job, because they both make an employee’s waiver of tribunal claims legally effective, but they get there differently. A settlement agreement is a private contract that must be in writing and, critically, the employee must first take advice from an independent adviser (usually a solicitor). A COT3 needs neither independent legal advice nor prescribed statutory wording, because the involvement of the neutral ACAS officer supplies the safeguard instead. That makes a COT3 faster and cheaper, though it is normally confined to the specific dispute ACAS has conciliated, whereas a settlement agreement is often drafted to release a wider range of claims.

Why it matters in a contract

A COT3 is a binding contract, and treating it casually is a common and expensive mistake. Once ACAS records that agreement has been reached, the terms are enforceable and the tribunal claim is over, so the wording of the release, the payment amount, and any conditions (a reference, confidentiality, a tax indemnity) all need to be right before anyone confirms acceptance.

For an employer that resolves disputes regularly, each COT3 or settlement agreement carries continuing obligations: a payment due by a set date, a confidentiality undertaking, sometimes an agreed reference. Storing these settlements in a contract repository with an audit trail, and setting deadline alerts for the payment date, keeps a business on top of what it has promised. Pactolane’s repository and renewal and deadline alerts do exactly this, and PactAI can produce a plain-language executive summary of a signed settlement so the team can see its key terms at a glance.

Example

An employee brings an unfair dismissal claim. During ACAS early conciliation, the employer offers 8,000 pounds to settle. The employee accepts, and the ACAS officer records the terms on a COT3: the sum is payable within 14 days, the employee withdraws the claim, and both sides keep the terms confidential. No independent legal advice was required, and the tribunal claim comes to an end once the COT3 is concluded. Had the parties settled privately instead, without ACAS, they would have needed a settlement agreement with the employee independently advised for the waiver to bind.

Related terms

A COT3 sits alongside the settlement agreement, without prejudice negotiations, and the wider law on waiving employment claims, all of which govern how a workplace dispute can be brought to a close.