What it is

Constructive dismissal is defined in s.95(1)(c) of the Employment Rights Act 1996 — you terminate the contract because of the employer's conduct.

For a claim to succeed you must show:

  1. The employer committed a fundamental breach of contract, either of an express term (e.g. pay, role, location) or the implied term of mutual trust and confidence.
  2. You resigned in response to that breach.
  3. You did not delay too long before resigning (a delay can be treated as affirming the contract — though continuing under protest can help).

It is a high bar. Tribunals look for serious breaches — significant unilateral pay cuts, demotion without consent, sustained bullying ignored after grievance, removal of duties, etc.

"Last straw" cases

A series of less serious incidents can together amount to a fundamental breach — the "last straw" doctrine (Omilaju v Waltham Forest LBC [2004] EWCA Civ 1493). The final act doesn't need to be a breach on its own, but it must contribute to the cumulative breach.

Raise a grievance first

Tribunals expect you to give the employer a chance to put it right. Always raise a formal grievance under the ACAS Code before resigning. The grievance also evidences your reasons for resigning later.

Notice + resignation letter

  • You can resign with notice or without notice (the breach gives you the right to walk away).
  • The resignation letter should state clearly that you are resigning in response to the breach (refer to the specific events). Vague letters undermine claims.

Mitigation + financial cost

You are expected to mitigate your loss (look for other work). Awards include a basic award (calculated like statutory redundancy) plus a compensatory award for loss of earnings, capped at the lower of 52 weeks' pay or the statutory cap (£118,223 from 6 April 2025).

Time limit

3 months less one day from the effective date of termination (the date your resignation took effect). Start ACAS Early Conciliation first.