How long do I have to bring a claim, and does anything pause the clock?
Short answer One deadline, strictly enforced. Only notifying ACAS pauses it.
The tribunal clock runs from the relevant date, usually the dismissal or the act complained of, not from the date you decide to act. An internal appeal does not pause it, which is the single most destructive misunderstanding in the whole system: people wait for the appeal outcome, then find the deadline has passed. Notifying ACAS for Early Conciliation is what pauses the clock. If a date is close, that notification is what preserves the claim.
Key rule
An internal appeal does not extend or suspend the time limit for presenting a tribunal claim. Notifying ACAS for Early Conciliation is what pauses the clock. For most claims the limit is six months less one day where the relevant date falls on or after 1 October 2026, and three months less one day where it falls before that.
Source: Employment Rights Act 2025, s.152 and Sch.12, in force 1 October 2026 under SI 2026/954 (regulation 4 fixes the relevant date); breach of contract claims in England and Wales under SI 2026/759
Practical guidance: The determining fact is the relevant date, not the date of enquiry, so a matter can be in time on one basis and out of time on another. Where a date is close, notify ACAS first and take advice second.
The deadline comes first: the free Tribunal Claim Readiness Check applies the right limit to your relevant date, adjusts it for Early Conciliation, and checks qualifying service, the claims and the documents. The figure is a different question: the schedule of loss calculator and the settlement calculator answer it. All run in your browser and transmit nothing.