ACAS Early Conciliation Process Explained

ACAS Early Conciliation is a mandatory pre-Employment Tribunal process in most workplace disputes in England and Wales. It is designed to help employees and employers resolve disputes without the need for formal tribunal proceedings.

The process is administered by the Advisory, Conciliation and Arbitration Service (ACAS), an independent public body that promotes workplace dispute resolution. It applies to claims such as unfair dismissal, discrimination, unpaid wages, redundancy disputes, and whistleblowing claims.

Before a claimant can usually submit an Employment Tribunal claim, they must first contact ACAS and obtain an Early Conciliation certificate. This guide explains how the process works, key legal rules, time limits, and practical outcomes.

What ACAS Early Conciliation Is

ACAS Early Conciliation is a structured negotiation process aimed at settling employment disputes before they reach tribunal.

Key features include:

• It is free of charge
• It is confidential
• It is voluntary in terms of settlement (not compulsory to agree terms)
• It is a legal requirement in most Employment Tribunal claims

The process is governed by the Employment Tribunals Act 1996 and supporting procedural rules.

When Early Conciliation Is Required

In most cases, a claimant must complete Early Conciliation before filing a tribunal claim.

It applies to:

• Unfair dismissal
• Discrimination claims under the Equality Act 2010
• Unlawful deduction from wages
• Redundancy disputes
• Whistleblowing detriment claims

Exceptions include certain claims such as:

• Some group or multiple claims involving the same employer and issues already covered
• Cases where ACAS considers conciliation not possible or appropriate

If Early Conciliation is required but not completed, the tribunal may reject the claim.

How the ACAS Early Conciliation Process Works

Step 1: Contacting ACAS

The process begins when the claimant submits an Early Conciliation notification to ACAS.

This includes:

• Personal details
• Employer details
• Brief description of the dispute

At this stage, no full legal case needs to be prepared.

Step 2: Allocation of an ACAS Conciliator

ACAS assigns a conciliator who acts as a neutral facilitator.

The conciliator:

• Contacts both parties
• Explains the process
• Explores whether settlement is possible
• Does not take sides or give legal advice

Step 3: Initial Contact with Employer

The conciliator will usually contact the employer to:

• Inform them of the claim
• Establish willingness to negotiate
• Begin settlement discussions

Participation is voluntary, but most employers engage at this stage.

Step 4: Negotiation Period

If both parties agree to participate, ACAS facilitates discussions.

Possible outcomes include:

• Financial settlement
• Agreed reference wording
• Confidentiality agreements
• Resolution without tribunal proceedings

If agreement is reached, it is recorded in a COT3 agreement, which is legally binding.

Step 5: No Settlement or Conciliation Ends

If settlement is not achieved:

• ACAS closes the process
• A certificate is issued
• The claimant may proceed to Employment Tribunal

The certificate is essential for lodging most claims.

ACAS Early Conciliation Certificate

The Early Conciliation certificate confirms that the claimant has complied with the pre-claim requirement.

It contains:

• A unique certificate number
• Dates of conciliation period
• Confirmation that ACAS involvement has ended

This number must be included in the Employment Tribunal claim form (ET1).

Time Limits and the “Clock Stop” Rule

Employment Tribunal claims are subject to strict limitation periods, usually:

• Three months less one day from the date of the dispute (e.g. dismissal or discriminatory act)

Early Conciliation affects this time limit.

How it works:

• The limitation clock pauses when Early Conciliation begins
• It resumes once ACAS issues the certificate

This ensures claimants are not disadvantaged by time spent in conciliation.

COT3 Settlement Agreements

If settlement is reached during Early Conciliation, it is formalised in a COT3 agreement.

Key features:

• Legally binding
• Enforceable in the civil courts
• Does not require independent legal advice
• Covers agreed terms such as compensation or references

Once signed, tribunal proceedings cannot usually continue on the same issue.

Duration of Early Conciliation

The process typically lasts:

• Up to 6 weeks initially
• Can be extended by agreement if settlement discussions continue

ACAS may end the process earlier if:

• One party does not wish to engage
• Settlement is clearly not possible

Benefits of Early Conciliation

Early Conciliation offers several advantages:

• Avoids tribunal proceedings
• Reduces legal costs
• Provides quicker resolution
• Allows flexible settlement terms
• Maintains confidentiality

It is widely used as a first-stage dispute resolution mechanism.

Limitations and Risks

Despite its benefits, there are limitations:

• No obligation to reach agreement
• No binding decision from ACAS
• Time pressure due to limitation rules
• Possible imbalance in negotiation power
• No formal evidence testing or legal determination

If no settlement is reached, tribunal proceedings may still be required.

What Happens After Early Conciliation

After the process ends:

• The claimant files an Employment Tribunal claim (ET1)
• The ACAS certificate number must be included
• Tribunal proceedings begin formally
• Case management and hearing preparation follow

The tribunal case is separate from the ACAS process.

Common Issues in Early Conciliation

1. Late notification

Delays can risk missing tribunal limitation deadlines.

2. Lack of engagement

One party may refuse to negotiate, ending the process quickly.

3. Unrealistic expectations

Settlement discussions may fail if parties are far apart on valuation.

4. Insufficient preparation

Although formal legal pleadings are not required, clarity helps negotiations.

Practical Role in Employment Disputes

ACAS Early Conciliation plays a central role in UK employment law because it:

• Filters out claims that can be resolved early
• Reduces tribunal caseload
• Encourages settlement before litigation
• Provides a structured negotiation framework

It is often the most important early stage in employment disputes.

Key Takeaways

ACAS Early Conciliation is a mandatory pre-tribunal process for most Employment Tribunal claims in England and Wales. It involves neutral facilitation by ACAS to explore settlement before formal proceedings begin. If successful, disputes are resolved through a binding COT3 agreement. If not, an Early Conciliation certificate is issued, allowing the claimant to proceed to tribunal while preserving limitation periods through a “clock stop” mechanism.