How long do I have to appeal, and does appealing protect my tribunal claim?

Short answer Two separate clocks. The appeal does not pause the other one.

Your internal appeal deadline is set by your employer and is usually short, often five working days from the outcome letter. That is the one most people meet. Separately, the tribunal clock runs from the relevant date, and an internal appeal does not pause it. Notifying ACAS is what pauses it. That is the one most people miss, and missing it is not recoverable.

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 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, with the Employment Tribunal (Extension of Time Limits) (Miscellaneous Amendments and Transitional Provisions) Regulations 2026

Practical guidance: ACAS Code of Practice on disciplinary and grievance procedures (2015), paragraphs 26 to 29 on appeals

If your outcome letter is dated and you are unsure which limit applies to you, the free tools include a time limit check, and the answer turns on the relevant date rather than on the date you decide to act.

Three steps, in order

Learn, test, act

Most people arrive at an appeal knowing they disagree with the outcome and not knowing how to say so in a form an appeal manager has to answer. These three take you from one to the other, and the first two are free and require nothing from you.

1. Learn The appeal hearings guide explains what a ground of appeal is, the difference between a rehearing and a review, whether new evidence can be introduced, and whether an appeal can make your position worse. Read the guide

2. Test The Appeal Analyser works through your decision letter and the process behind it, and sets out which grounds are open on what you describe, how well evidenced each one currently is, and the order to put them in. Runs in your browser, asks for no email address. Open the analyser

3. Act Where the grounds are there but the drafting or the hearing is the obstacle, the Appeal Defence Package covers the analysis, the written grounds and representation at the hearing itself. See what it covers

The questions people actually ask

Appeal questions, answered

Each of these links to the answer on the guide that covers it. Nothing is duplicated here, because two pages answering the same question is two places for the answer to drift.

What commonly goes wrong

Drawn from the appeal hearings guide, because these are the points that decide most appeals and they are worth meeting before you write anything.

Waiting for the appeal outcome before thinking about a tribunal claim. An internal appeal does not pause the time limit. Notifying ACAS is what pauses it, and this is the single most destructive misunderstanding in the whole system.
An appeal heard by someone already involved in the original decision, where somebody uninvolved was available.
Grounds written as a restatement of the original defence rather than as a challenge to the finding, the process or the sanction.
No answer to whether the appeal is a rehearing or a review, which decides whether new evidence and new argument will actually be considered.
A two-line outcome letter that does not engage with the grounds raised, which invites the question of whether the appeal was ever a genuine reconsideration.
A refusal to hear an appeal at all, which paragraph 4 and paragraph 26 both cut against and which is straightforward to evidence once it is in writing.

Seen in practice

Anonymised accounts of real matters

Written around the method rather than the result: what was alleged, what the evidence actually showed, where the employer’s own procedure was departed from, and what was put on the record.

Read the case studies →

Primary sources

ACAS Code of Practice on disciplinary and grievance procedures, in force 11 March 2015, paragraphs 26 to 29, via acas.org.uk
Employment Relations Act 1999, section 10, on accompaniment at appeal hearings, via legislation.gov.uk
Employment Rights Act 1996, sections 94 and 98, via legislation.gov.uk
Employment Rights Act 2025, section 152 and Schedule 12, via legislation.gov.uk

Written by Shakil Dixon, Founder and Principal Representative, Zhan Associates, Trade Union Representative accredited by Unite the Union.

Reviewed: 11 September 2026. This page states the law in force on that date. Next review: December 2026.

This page concerns England and Wales and is general information, not advice on your own case. Zhan Associates attends hearings in person across Birmingham and the wider West Midlands. Representation elsewhere in England and Wales is delivered virtually, by Microsoft Teams or Zoom, as part of the same service and at the same fixed fee. Check the limitation period that applies to your own claim before relying on any date given here.

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Appealing a disciplinary decision or a dismissal