ACAS early conciliation (2026): Process, time limits, and what happens next

ACAS early conciliation is a statutory pre-litigation process required before most employment tribunal claims. You must notify ACAS within three months of your dispute; missing this deadline prevents your claim from proceeding. A trained ACAS conciliator facilitates confidential discussions to explore settlement over 4–6 weeks. An employment law solicitor can clarify eligibility, protect your negotiating position, and ensure you meet strict procedural deadlines.

Ready to understand your obligations? Continue reading.

Is ACAS early conciliation mandatory for your claim?

Quick answer:

Yes, unless your claim involves interim relief, tribunal costs-only matters, or national security issues.

ACAS early conciliation is legally required for most employment disputes. You cannot file at tribunal without first notifying ACAS, unless your claim falls within a narrow exemption.

Claims that require early conciliation:

• Unfair dismissal
• Working time breaches
• Wage disputes and unpaid leave
• Whistleblowing (Public Interest Disclosure)
• Discrimination (age, sex, race, disability, religion, sexual orientation)

Exemptions (under the Employment Tribunals (Early Conciliation: Exemptions) Order 2014):

• National security cases.
• Proceedings after default judgment.
• Claims dismissed for procedural non-compliance.
• Claims relating solely to tribunal costs or conduct.
• Interim relief applications (emergency injunctions).

What are the three critical ACAS early conciliation time limits you cannot miss?

ACAS early conciliation involves three outcome-determinative deadlines. Missing any one prevents your claim from proceeding.

Deadline 1: Notify ACAS within three months

Quick answer:

Notify ACAS by day 90 from your dismissal or dispute date, or your claim cannot proceed.

Your employment claim must reach ACAS within three months of the triggering event. For unfair dismissal, this is your dismissal date. For discrimination, it is the final discriminatory act. For unpaid wages, it is the payment due date. If you notify ACAS on day 91, your claim is time-barred and cannot be revived.

Example:

Dismissed 1 January 2026 → notify ACAS by 1 April 2026.

Deadline 2: The clock pauses during early conciliation

Whilst ACAS early conciliation is ongoing, the three-month deadline does not count. The clock pauses from your ACAS notification date until 28 days after ACAS issues your certificate.

Continuing the example:

Notify ACAS 15 February 2026. If ACAS issues certificate 15 March 2026, your three-month deadline extends to 12 April 2026.

Deadline 3: File at tribunal within 28 days of the certificate

Quick answer:

File at tribunal within exactly 28 days of receiving your certificate, or your claim cannot proceed.

Once you receive your ACAS certificate, you have 28 days to file your ET1 claim form at the Employment Tribunal. Submit before midnight on day 28 or your claim will be rejected.

How does the ACAS early conciliation process work? Five steps explained

ACAS early conciliation follows a clear, sequential process:

1. Submit your early conciliation form: Complete your ACAS early conciliation form online via the ACAS website, by telephone, or by post. Include your name, the employer’s details, and a brief dispute summary. You will receive a unique ACAS early conciliation number; keep this for all future correspondence.
2. ACAS contacts the employer: Within 3 working days, ACAS contacts the employer to invite participation. If the employer refuses, a certificate is still issued. You may proceed to tribunal, though non-engagement may affect costs decisions later.
3. Individual confidential telephone discussions: Over 2-4 weeks, the ACAS conciliator calls each party separately. These conversations are entirely confidential. The conciliator identifies your settlement priorities and explores the employer’s willingness to settle. Nothing disclosed is admissible in tribunal proceedings if negotiations fail.
4. Shuttle negotiation: If both parties are willing, the conciliator conveys offers between parties. They may offer non-binding settlement views based on tribunal precedent, but never guarantees.
5. ACAS issues the certificate: After 4-6 weeks (or sooner if settlement is reached), ACAS issues your ACAS early conciliation certificate. If settlement was agreed, both parties sign a binding agreement. If not, the certificate confirms that status; either party may file at tribunal.

What are the possible outcomes of ACAS early conciliation?

ACAS early conciliation can result in three distinct outcomes: a binding settlement agreement, failed negotiations that allow tribunal filing, or employer non-engagement. Understanding each outcome helps you plan your next steps and manage expectations throughout the process.

Outcome 1: Settlement agreement reached

Quick answer:

Settlements are legally binding once signed; you receive compensation and the case closes.

If both parties agree, ACAS facilitates a binding settlement agreement. This typically includes financial compensation and sometimes non-financial terms (job reference, apology, reinstatement). Once signed, the settlement is final. You release all claims against the employer.

Settlement payments under £30,000 currently may avoid income tax if structured in line with statutory redundancy rules.

Outcome 2: No settlement reached

If negotiations fail, ACAS issues a certificate confirming “settlement was not reached.” You retain full rights to file at tribunal. Nothing disclosed during early conciliation is admissible in tribunal; this is protected under without-prejudice privilege.

Outcome 3: Employer refuses to participate

If the employer declines to engage, a certificate is still issued. You may file at tribunal. The tribunal will note the refusal, which may negatively affect the employer’s costs liability if they later lose.

What happens after early conciliation fails? Filing at Tribunal

After ACAS early conciliation fails, you must file your employment tribunal claim within 28 days of receiving your ACAS certificate.

File your tribunal claim within 28 days

Submit your ET1 form online, by post, or by email to the Employment Tribunal. Include your personal details, respondent details, claim type (unfair dismissal, discrimination, etc.), and compensation sought. Attach your ACAS certificate as a PDF. Missing the 28-day deadline may prevent the claim from proceeding.

Before filing: Consider legal advice

Employment law solicitors offer tribunal preparation: case evaluation, witness statement drafting, cross-examination coaching, and evidence bundle assembly. Costs typically range £500-£1,500.

If your case reaches tribunal

The hearing lasts 1-3 days. You present evidence; the employer’s representative cross-examines you. The judge issues a written judgment within 2-4 weeks. If successful, you may recover lost wages, unfair dismissal awards (subject to the statutory cap in force at the relevant time), and discrimination damages.

FAQs

Is ACAS early conciliation mandatory? Yes, for most employment claims. Unless your claim involves interim relief, costs-only matters, or national security, you must notify ACAS before filing at tribunal.

What happens if the employer refuses ACAS early conciliation? ACAS issues a certificate confirming non-engagement. You may file at tribunal. The tribunal will note the refusal, which may affect costs if the employer later loses.

What is the ACAS early conciliation time limit? Notify ACAS within three months of your dispute. The clock pauses during conciliation and resumes 28 days after the certificate is issued.

Can I settle during ACAS early conciliation? Yes. If both parties agree, ACAS facilitates a binding settlement agreement. Once signed, the case closes and you release all claims.

How long does ACAS early conciliation take? The process typically takes 4-6 weeks from notification to certificate issuance.

What happens if I miss the ACAS notification deadline? Your claim cannot proceed. The three-month window is strict and cannot be extended. Missing it generally prevents the claim from proceeding.

ACAS early conciliation is a mandatory dispute resolution process that precedes most employment tribunal claims. Three time limits apply: notify ACAS within three months of your dispute, file at tribunal within 28 days of the certificate. Compliance is essential. For complex or high-value disputes, a solicitor reduces procedural risk.

This article provides general legal information only; consult a qualified employment law solicitor for your specific circumstances.

Ready to clarify your position?

Qredible’s network of employment law solicitors helps you confirm dispute eligibility, assess realistic settlement ranges against comparable tribunal precedents, and ensure all notification steps are properly documented.

KEY TAKEAWAYS:

• ACAS early conciliation is mandatory before filing most employment tribunal claims. Notify ACAS within three months of your dispute. The process is free, confidential, and takes 4-6 weeks. All disclosures are protected under without-prejudice privilege.
• Three time limits apply: notify ACAS within three months of the triggering event; the deadline clock pauses during early conciliation plus 28 days post-certificate; file at tribunal within 28 days of receiving your certificate. Meeting these deadlines is essential to preserve your claim.
• Instruct a solicitor for discrimination claims, disputes over £10,000, or when the employer appoints representation. Self-representation is reasonable for straightforward, low-value claims with clear liability and strong documentary evidence.