Early conciliation is a pre-claim process for most employment tribunal claims. Its most important practical role is not merely settlement: notifying Acas correctly and in time can affect calculation of the tribunal deadline.
Use this guide to separate the facts, the legal route and the practical remedy. Workplace disputes often involve more than one right, so keep each strand distinct.
Key points
- Identify the exact decision, event or omission before choosing a legal label.
- Ask who made the decision and which employer policy, contract term or statutory rule is relied on.
- Preserve contemporaneous evidence and the employer’s reasons before memories and records change.
- Protect Acas and tribunal time limits even while an internal process is continuing.
Diagnosis
First: what exactly happened?
Work out which route fits the facts before deciding what to ask the employer to do. Similar workplace problems can use different legal tests.
| What happened? | What to check |
|---|---|
| You are considering an employment tribunal claim | Check the underlying claim deadline first and notify Acas in time where early conciliation is required. |
| Your grievance or appeal is still running | Do not wait for the internal process if that risks limitation. |
| Acas conciliation has ended | Keep the certificate and recalculate the tribunal deadline carefully. |
| A settlement is proposed | Understand the full legal effect of a COT3 before agreeing wording, money, confidentiality or waiver terms. |
Who is responsible?
The employer is responsible for its own employment decisions and processes, even where HR, payroll, occupational health, an external investigator or software supplier is involved. Identify the actual decision-maker and the legal entity that employs you.
Managers and HR may administer a process, but outsourcing advice or relying on a policy does not transfer away the employer’s legal responsibility.
Limitation first
As at 11 September 2026, most claims whose time limit starts before 1 October 2026 still use the three-month-minus-one-day framework. For most relevant time limits starting on or after 1 October 2026, the period increases to six months minus one day.
The clock and early conciliation
Acas early conciliation can pause and adjust limitation calculations, but the rules are technical. Record the date of the act/dismissal, Acas notification date and certificate date rather than relying on a rough calendar estimate.
Conciliation is voluntary
Acas cannot force either side to settle. A failed conciliation does not decide the merits of the claim.
COT3 settlement
A COT3 can be legally binding and often settles specified claims. Make sure you understand what is being waived and any tax, reference, confidentiality or payment terms.
Acas early conciliation is the gateway before most tribunal claims.
Before making most employment tribunal claims, a prospective claimant must notify Acas. Acas offers early conciliation and, if the matter is not resolved or conciliation is not pursued to settlement, issues an early conciliation certificate needed for the tribunal claim, subject to statutory exceptions.
The tribunal clock and the workplace process are different systems.
A grievance, disciplinary appeal or HR investigation does not itself stop tribunal time. Early conciliation has statutory effects on calculation of the deadline, which is why the Acas notification date and certificate dates must be preserved.
The general time limit changes on 1 October 2026.
As at 9 September 2026, the usual time limit for most claims remains three months, often described in practice as three months minus one day from the relevant event. For the majority of claims where the workplace problem happens on or after 1 October 2026, the new six-month limit applies. Contract claims in Scotland move on a different commencement date, 9 November 2026.
Settlement through Acas can be legally binding.
Where agreement is reached through Acas, settlement is commonly recorded in a COT3. Read the terms carefully before agreeing: settlement can affect the right to pursue the matters covered.
Prepare a concise conciliation position.
- What legal claims may arise.
- The key dates and limitation position.
- Your strongest two or three factual points.
- What remedy or settlement outcome you actually want.
- Any non-financial terms that matter.
- The minimum evidence needed to explain why the claim has substance.
Conciliation is usually more effective when the parties can identify the real dispute and the practical settlement range, rather than reciting every workplace disagreement.
Know what a settlement will do.
A settlement reached through Acas is commonly recorded in a COT3. Once binding, it can settle the specified claims and prevent them being pursued in the tribunal. Read the scope carefully: payment, tax wording, references, confidentiality, non-disparagement and which claims are being waived may all matter.
Do not agree from the headline figure alone.
Ask for the complete terms before saying yes. A settlement figure can have different value depending on tax treatment, timing, reference wording, deductions and the breadth of claims released.
Notify Acas in time: the clock effect is technical.
The statutory early-conciliation process affects the tribunal limitation calculation. Record the original event date, the date Acas receives the notification and the date the certificate is issued. Do not estimate the final deadline by simply adding the number of conciliation days to the original date; the statutory rules can produce a different result.
As at 9 September 2026, most claims whose limitation period started before 1 October 2026 use the current three-month-minus-one-day baseline. Most periods starting on or after 1 October 2026 will use six months minus one day.
Early conciliation is not a merits decision.
Acas early conciliation gives the parties an opportunity to settle before a tribunal claim proceeds. The conciliator does not decide who is legally right, compel settlement or investigate the evidence. If no settlement is reached, Acas issues the certificate needed for most tribunal claims.
You can use conciliation to negotiate practical outcomes that a tribunal might not order in exactly the same form, such as an agreed reference, wording about departure, payment timing or other contractual terms.
What can you realistically ask for?
Choose a remedy that matches the problem. Internal processes can often correct a decision or record; statutory compensation and tribunal remedies depend on the legal claim.
- Settlement through Acas where both sides agree
- Early conciliation certificate enabling tribunal claim where required
- COT3 terms covering money and other agreed outcomes such as references or announcements
Evidence worth keeping
Preserve the original record where possible. A short, dated evidence set is usually more useful than an unstructured dump of documents.
Common employer responses - and what they do not necessarily prove
| Employer says | ConsumerWise view |
|---|---|
| “You must finish the grievance before Acas will deal with you.” | No. Protecting tribunal limitation is separate from the internal procedure. |
| “Starting Acas means you have filed a tribunal claim.” | No. Early conciliation is pre-claim; an ET1 is separate. |
| “If conciliation fails, Acas has decided your claim is weak.” | No. Failure to settle is not a merits judgment. |
| “The limitation period is always three months.” | Not after the October 2026 reform for most relevant time limits beginning on or after 1 October 2026. |
What to say next
Keep the next response short and issue-led. State the decision you challenge, the evidence or rule you rely on, the specific answer you still need and the remedy you want. If the employer relies on a policy or business reason, ask it to identify the relevant provision and explain how it applies to your facts.
Important overlaps and exceptions
- Interim-relief applications can have a seven-day deadline and special rules.
- Some claims do not require Acas notification.
- Multiple claim types can have different start dates even when they arise from the same events.
What to do
A practical next-step plan
- Write down the event or decision, the date, who made it and the practical impact.
- Identify the legal or contractual right that may apply instead of relying only on the word “unfair”.
- Collect the smallest evidence set that proves the key facts and the employer’s stated reason.
- Use the relevant internal request, grievance, appeal or complaint route and ask for a specific remedy.
- Check Acas and tribunal limitation separately. Do not let a slow internal process cause an external deadline to expire.
Escalation and time limits
Internal procedures can be important, but they do not normally stop an employment tribunal time limit. As at 11 September 2026, most claims whose limitation period starts before 1 October 2026 still use the existing three-month-minus-one-day framework. For most relevant time limits starting on or after 1 October 2026, the period increases to six months minus one day.
Acas early conciliation can affect calculation of the deadline if Acas is notified in time. Some claims use different limits, and interim relief in qualifying dismissal cases can require action within only 7 days. Always check the specific claim rather than applying a general period mechanically.
Official sources
Check the current source material.
- Acas: Early conciliation ↗
- Acas: Employment Rights Act 2025 changes ↗
- GOV.UK: Before you make a tribunal claim ↗
- Acas: employment tribunal time limits ↗
ConsumerWise provides general information rather than individual legal advice. Check current rules, dates and eligibility against the official source before acting.