How to Write a Workplace Grievance Letter

A grievance letter is how you formally tell your employer that something has gone wrong at work. It is not a complaint written to vent frustration. It is a written record that triggers a legal process - and it can matter significantly if your situation later leads to an employment tribunal claim.

A grievance is one rung on a longer ladder. If you want to see where it sits among the other steps - raising it informally, appealing, and ACAS Early Conciliation - our guide on what to do before making a tribunal claim sets out the full sequence.

What a grievance letter is and why it matters

A grievance is a formal complaint raised by an employee about a workplace issue. Common examples include bullying or harassment, discrimination, unfair treatment, health and safety concerns, changes to pay or terms without agreement, and being overlooked for promotion for an unlawful reason.

Writing it down - rather than raising it verbally - does two important things. First, it starts the clock on your employer's formal procedure. Second, it creates a contemporaneous record: a document that exists from the time the problem was live, not reconstructed months later.

Tribunals pay close attention to the ACAS Code of Practice on Disciplinary and Grievance Procedures. Under section 207A of the Trade Union and Labour Relations (Consolidation) Act 1992, where either party unreasonably fails to follow the Code, the tribunal can adjust any compensation award by up to 25 percent. If your employer ignores your grievance and you have followed the process properly, that failure counts in your favour.

When to write a formal grievance letter

Not every workplace problem needs a formal grievance letter. A conversation with your line manager or HR may be the right first step for minor issues. The formal route makes more sense when:

• The issue is serious and affects your working conditions, health, pay, or protected characteristics
• An informal conversation has not resolved things
• You are considering resigning and may want to claim constructive dismissal
• You want a written record because you think the matter may eventually go to tribunal

If you are being managed out, bullied, or discriminated against, raising a grievance creates evidence that you tried to resolve the issue internally. This matters a great deal in constructive dismissal claims.

What to include in your grievance letter

A grievance letter does not need to be long. It does need to be clear and factual. Here is what to put in it.

Your details and the date

Include your full name, job title, and the date at the top. Address the letter to your HR manager or, if HR is the subject of the complaint, the most senior independent person you can identify.

A clear statement that this is a formal grievance

Use the phrase "formal grievance" explicitly. This is important. Vague language like "I want to raise a concern" may not trigger the formal procedure.

A factual chronology

Set out what happened, in date order. Include dates, names of people involved, and what was said or done. Be specific. "My manager raised his voice at me in the team meeting on 14 March 2026 in front of six colleagues, calling my work 'useless'" is far more useful than "my manager has been treating me badly."

Which right, policy, or rule was breached

You do not need to cite legal sections by number. Plain language is fine: "This behaviour constitutes harassment under the company's dignity at work policy" or "This is a deduction from wages without my agreement, contrary to my contract."

The outcome you want

State what resolution you are seeking. Examples include a written apology, a change to your working arrangements, repayment of money owed, or an independent investigation. Tribunals and employers find it easier to respond to a clear ask.

A request for a grievance meeting

Ask for a date to meet and discuss the grievance formally. The ACAS Code requires your employer to invite you to a meeting without unreasonable delay.

Tone and approach

Keep the letter factual and calm. This is difficult when the situation has caused you real distress - but emotional language weakens your letter. Tribunals and HR departments respond better to documented facts than to expressions of anger.

Avoid threats. Statements like "I will take legal action unless..." are counterproductive at this stage. Raise the facts and let the process work.

Do not speculate about motives. Write what happened, not what you think the person intended.

Two to four pages is usually enough. If the issue is complex, you can attach a supporting chronology as an appendix and keep the main letter shorter and clearer.

Where to send it

Send the letter to your HR department, or to your line manager's manager if your line manager is the subject of the complaint. If HR is the subject, address it to the most senior independent person in the business.

Send it by email so you have a timestamp and a delivery record. If you send it by post, use recorded delivery and keep the tracking reference. Keep a copy of everything you send.

If you hand-deliver it, ask for a written receipt or send a follow-up email the same day noting that you handed it over in person.

Your right to be accompanied

You have a statutory right under section 10 of the Employment Relations Act 1999 to be accompanied at any formal grievance meeting by a trade union representative or a work colleague of your choice. Your employer cannot refuse this request if you make it in good time.

Your companion can speak on your behalf, make notes, and confer with you during the meeting. They cannot answer questions put directly to you unless your employer agrees to this.

If your employer refuses to allow a companion when you have properly requested one, this is a breach of a statutory right and is itself relevant evidence in any subsequent tribunal claim.

What happens after you send it

Your employer should acknowledge receipt and invite you to a grievance meeting. The ACAS step-by-step grievance guide sets out the expected process in full.

At the meeting, you will be able to explain the grievance in your own words and refer to any documents you want the employer to consider. Your employer may investigate, speak to witnesses, and review records before giving you a written outcome letter.

You have the right to appeal if you are unhappy with the outcome. Always exercise this right if the outcome went against you, before considering a tribunal claim - skipping the appeal without good reason can reduce your compensation under the ACAS Code.

Keep notes of every meeting. If your employer does not provide minutes, send your own summary by email within a day or two, so there is a record of what was discussed.

The tribunal clock does not stop

This is one of the most important points in this guide. Raising a grievance does not pause the deadline for bringing an employment tribunal claim (6 months less 1 day for acts on or after 1 October 2026, 3 months less 1 day before). The clock keeps running from the date of the act you are complaining about.

The only mechanism that pauses the deadline is starting ACAS Early Conciliation. If your tribunal deadline is approaching, you must start ACAS Early Conciliation in time - do not wait for your grievance process to conclude first.

For more on how these deadlines work, see the guide to employment tribunal deadlines.

How a grievance interacts with constructive dismissal

If you are considering resigning because your employer has fundamentally breached your contract - through sustained harassment, a serious unauthorised pay cut, or a breakdown of trust caused by your employer's conduct - raising a grievance before you resign is generally important.

It shows you tried to resolve the issue before leaving. In a constructive dismissal claim, a tribunal will look at whether you raised the breach with your employer and gave them a reasonable opportunity to address it. If you leave without raising a grievance, your employer may argue you accepted the breach or did not give them the chance to fix it.

There are situations where raising a grievance is genuinely not possible - for example, where the working environment has become intolerable. In those cases, tribunals have found that resignation without a grievance can still amount to constructive dismissal. But this is the exception rather than the rule.

For more on this, see the guide to constructive dismissal. When you come to write the resignation itself, the constructive dismissal resignation letter guide sets out what it needs to say, with a template.

This guide contains legal information, not legal advice. Employment law is fact-specific. In similar situations, tribunals have looked at the full picture - what was raised, when, and how both sides responded. If you are unsure how this applies to your situation, you may want to consider speaking to an employment law specialist.