Filing an Employment Tribunal claim starts with one document: the ET1 form. Get it right, and you give your case the strongest possible foundation. Get it wrong, and you risk delays, rejected claims, or permanently weakening your legal position. This guide walks you through exactly how to fill in the ET1 form in the UK — section by section — so you understand not just what to write, but why each part matters.
The ET1 is your formal claim against an employer. It tells the tribunal who you are, who you're claiming against, and what happened. Judges read hundreds of these. Clarity, accuracy, and completeness make yours stand out for the right reasons. Missing deadlines, leaving sections incomplete, or describing your claim vaguely can all count against you. Most people only do this once. That's precisely why it pays to understand the process before you start typing.
What Is How to Fill In ET1 Form UK?
The ET1 is the official claim form used to start employment tribunal proceedings in the United Kingdom. If you believe your employer has treated you unlawfully — through unfair dismissal, discrimination, unpaid wages, or another workplace grievance — this form is how you formally lodge that complaint with the tribunal service.
Filling in the ET1 correctly matters enormously. Errors, omissions, or vague descriptions of your claim can weaken your case before it even reaches a hearing. The form asks for specific details: your personal information, your employer's details, your employment dates, and a clear account of what happened and why you believe it was unlawful.
The process is handled through the Employment Tribunals Service in England, Wales, and Scotland. Northern Ireland operates a separate system under the Industrial Tribunals. Most people submit their ET1 online through the ACAS Early Conciliation portal, though paper submissions remain an option in certain circumstances.
Timing is critical. In most cases, you have just three months minus one day from the date of the act you're complaining about to submit your claim. Missing this deadline will almost certainly result in your case being rejected, regardless of its merits.
Understanding how to fill in the ET1 form means understanding not just the mechanics of the document itself, but the legal context surrounding it — what qualifies as a valid claim, what evidence supports your position, and how the language you use frames the tribunal's first impression of your case. Getting this right from the start gives your claim the strongest possible foundation.
Key Benefits of How to Fill in ET1 Form UK
Understanding how to fill in the ET1 form correctly gives you a genuine advantage before your case even begins. The Employment Tribunal process is formal and unforgiving of errors. Getting this right from the start matters.
You protect your legal position from day one. A properly completed ET1 ensures your claims are clearly stated, your facts are accurately recorded, and the respondent cannot exploit vague or contradictory information. Tribunals read these forms carefully. Precision signals credibility.
You avoid costly delays. Incomplete or unclear ET1 forms are frequently returned by the tribunal administration, wasting precious time. Given the strict three-month minus one day deadline that applies to most employment claims, any delay can be fatal to your case. Filling in the form correctly the first time keeps your claim on track.
You set the narrative. The ET1 is your first opportunity to tell your story on the record. A well-structured account of events, presented in chronological order with relevant dates and details, shapes how the tribunal views your claim from the outset. A disorganised submission does the opposite.
You reduce reliance on expensive legal support. When you understand each section of the ET1 and what it requires, you can complete more of the process independently. That reduces solicitor time and associated costs, without compromising the quality of your submission.
You avoid undermining valid claims. Many genuinely strong cases are weakened by poorly worded particulars of claim. Knowing how to articulate what happened, why it was unlawful, and what remedy you are seeking keeps your claim coherent and focused.
You approach the process with confidence. Familiarity with the form removes uncertainty. You know what is being asked, why it matters, and how to respond. That clarity is practical, not just reassuring.
How to Fill in ET1 Form UK Works
The ET1 is the official claim form you submit to an Employment Tribunal. It sets out who you are, who you're claiming against, and what happened. Getting it right matters — this document forms the foundation of your entire case.
Start with your personal details. Section 1 asks for your name, address, and contact information. Be precise. Any mismatch between your details and your employment records can cause unnecessary delays.
Identify the respondent correctly. Section 2 is where you name your employer. Use the exact legal name of the business, not just a trading name. Check your payslips or contract if you're unsure — naming the wrong entity is a common mistake that can weaken your claim from the outset.
Describe your employment. Sections 3 and 4 ask for your job title, start date, end date (if applicable), and earnings. Include notice pay, benefits, and any additional payments you received. Accuracy here directly affects any compensation calculation later.
Select your claim type. Section 5 lets you tick the type of claim — unfair dismissal, discrimination, unpaid wages, and others. You can tick more than one if relevant. Think carefully about every legal basis that applies to your situation.
Tell your story clearly in Section 6. This is the most important part. Explain what happened in plain, factual language. Stick to dates, events, and specific actions. Avoid emotional language and vague statements. The tribunal needs facts, not frustration.
Check the time limit. Most claims must be submitted within three months minus one day from the act complained of. Missing this deadline usually means your claim is rejected.
Submit through ACAS first. Before filing the ET1, you must notify ACAS via Early Conciliation. You'll receive a certificate number to include on the form. Without it, your claim won't proceed.
Common Questions About How to Fill in ET1 Form UK
Do I have to complete the ET1 online? Not necessarily. You can submit a paper ET1 by post, but the online service through the Employment Tribunal website is faster and gives you immediate confirmation of receipt. Most claimants use the online route.
What happens if I miss a section? The tribunal may return your form or ask for clarification, which wastes time. Complete every relevant section carefully. If a question genuinely does not apply to your situation, write "not applicable" rather than leaving it blank.
How much detail should I include in the "Details of Claim" box? Be specific but concise. State what happened, when it happened, and why you believe it was unlawful. Avoid lengthy personal commentary. Stick to facts, dates, and the legal basis for your claim.
Can I claim more than one thing on the same ET1? Yes. You can include multiple claims, such as unfair dismissal and unpaid wages, on a single form. List each one clearly in the relevant sections.
What is the time limit for submitting? For most claims, you have three months minus one day from the date of the act you are complaining about. Early conciliation through Acas pauses this clock, but you must act quickly. Missing the deadline usually means your claim will not be accepted.
Do I need a solicitor to fill it in? No. Many people complete the ET1 themselves. That said, if your case is complex, professional advice can help you present your claim accurately and avoid errors that could weaken your position.
Conclusion
Filing an ET1 is one of the most important steps you can take to protect your employment rights. Getting it right matters — errors or missed deadlines can end a claim before it begins.
Here are the key points to carry forward:
- The three-month minus one day deadline is strict. Start early.
- Early conciliation through Acas is mandatory before submitting your form.
- Be specific. Vague descriptions of what happened weaken your claim.
- Double-check every section before submitting, particularly your remedy calculations.
- Keep copies of everything — your ET1, your Acas certificate, and any confirmation from the tribunal.
The ET1 form is available directly through the HMCTS online portal. If your situation involves complex discrimination claims, whistleblowing, or multiple respondents, consider speaking with an employment solicitor or contacting your local Citizens Advice before submitting.
You have rights. Taking this step carefully, and promptly, gives your claim the strongest possible foundation.
Learn more about Employment Tribunal Representation.