Settlement Agreement vs COT3: The Key Differences

Settlement agreement or COT3? If you are trying to resolve a dispute with an employee or agree a clean exit, you will quickly come across both terms, and they are easy to confuse. They do a similar job, preventing an employee from bringing or continuing a tribunal claim, but they become legally binding in different ways, suit different situations, and give you different levels of control. Choosing the wrong one, or getting the formalities wrong, can leave you exposed to a claim you thought you had settled. This guide explains the difference in plain terms.

The two routes at a glance

Both a settlement agreement and a COT3 are legally binding contracts under which an employee gives up the right to pursue specified employment claims, usually in return for a payment. The crucial difference is what makes each one valid.

• A settlement agreement is governed by section 203 of the Employment Rights Act 1996. It is only binding if the employee has taken independent legal advice on its terms from a qualified adviser.
• A COT3 is the agreement used to record a settlement reached through Acas conciliation. It is binding because an Acas conciliator has been involved, and the employee does not need to take independent legal advice for it to be valid.

You may also hear the older term compromise agreement. That is simply the previous name for a settlement agreement, renamed by the Enterprise and Regulatory Reform Act 2013. There is no separate document, just a change of name.

The defining difference: independent legal advice

The single most important practical difference is the legal advice requirement.

A settlement agreement is not worth the paper it is written on unless the employee has received independent advice from a relevant adviser, normally a solicitor, on the terms and effect of the agreement, and that adviser is named in the document with valid professional indemnity insurance. Because the employee needs that advice, employers are expected to contribute towards the cost, typically £350 to £500 plus VAT. Skip this, and the agreement is unenforceable.

A COT3 has no such requirement. The Acas conciliator's involvement is what gives it legal effect. That makes a COT3 faster and cheaper to conclude, with no legal fee contribution to fund and no waiting for the employee's solicitor. The trade-off is that the Acas conciliator is impartial and does not advise either side on whether the deal is good, so neither party gets that independent steer.

We cover the mechanics of each route in more depth in our dedicated guides to settlement agreements and to COT3 agreements and the Acas conciliation process.

When to use a settlement agreement

A settlement agreement tends to be the better choice when you are managing a situation proactively and want tight control of the process and timing. Common examples include:

• A planned, mutually agreed exit, where there is no active dispute and you want to initiate the conversation cleanly.
• A stalled performance or capability process, where a negotiated departure is preferable to a drawn-out formal procedure.
• A sensitive redundancy where you are offering enhanced terms above the statutory minimum and want certainty that no claim will follow.
• A confidential departure of a senior employee, where bespoke terms and careful drafting matter.

A major advantage here is the protected conversation under section 111A of the Employment Rights Act 1996. This lets you raise the possibility of an agreed exit without that conversation being used against you in an ordinary unfair dismissal claim, provided there is no improper behaviour. It gives you a controlled, private way to open discussions that a COT3 route does not offer in the same way.

When to use a COT3

A COT3 comes into its own when Acas is already involved or a dispute is already live. It is often the natural choice when:

• An employee has started early conciliation or has already lodged a tribunal claim.
• You want a quick, low-cost resolution without funding the employee's legal advice.
• A dispute has crystallised and both sides simply want to agree terms and move on.

Because conciliation can continue right up to and during a tribunal hearing, a COT3 also lets you settle late in the day if a claim is already in the system. If you would like Acas to lead the negotiation, our guide to employer-led conciliation explains how to take the initiative rather than wait.

Where the two routes are the same

Despite their differences, the two documents share important features:

• Tax treatment is identical. The first £30,000 of a genuine ex-gratia termination payment is normally free of income tax and National Insurance, while earnings such as salary, holiday pay and payment in lieu of notice are fully taxable under the post-employment notice pay rules.
• Both are binding and enforceable. If either side breaches the agreement, it can be enforced through the civil courts as a breach of contract.
• Both should clearly list the claims being settled. A waiver that is too narrow leaves you exposed, while one that is unclear can be challenged.
• Both can include practical terms, such as an agreed reference, confidentiality and return of company property.

A simple way to decide

As a rule of thumb:

• If you are initiating an exit or settlement, away from any active claim, and want control and confidentiality, a settlement agreement with a protected conversation is usually the stronger route.
• If a dispute is already live, Acas is involved, or you want speed and lower cost, a COT3 through conciliation often makes more sense.

In some cases the choice is made for you by timing. In others it is a genuine judgement call, and the wrong decision can cost you control of the process or leave a gap in your protection. This is rarely a decision to make on instinct alone.

How Rebox HR can help

The difference between these two routes is not academic. It affects how much you pay, how quickly you can resolve matters, how much control you keep, and whether your protection is watertight. At Rebox HR, we help employers choose the right approach for the situation in front of them, then handle it from start to finish, whether that means structuring a protected conversation and drafting a settlement agreement or managing Acas conciliation through to a binding COT3.

If you are weighing up how to part company with an employee or settle a dispute, visit our settlement agreements service or book a free consultation and we will help you pick the route that protects your business best.