What a Formal Grievance Actually Is
A formal grievance is not just a complaint. Under the ACAS Code of Practice on Disciplinary and Grievance Procedures, raising a formal grievance is a legal step that triggers specific obligations on your employer. They must investigate, hold a hearing, issue a written outcome, and give you the right to appeal.
Critically, a formal grievance creates a documented paper trail. If your situation later proceeds to an Employment Tribunal, the way your employer handled your grievance — and whether they followed the ACAS Code — will be scrutinised. Employers who fail to follow the Code can face a tribunal uplift of up to 25% on any compensation awarded.
That means a poorly handled grievance is not just bad for the employee. It is a financial and legal liability for the employer. Use that.
Timing: When to File
Timing matters more than most employees realise.
File too early — before you have documented the specific incidents — and your grievance may lack the detail needed to force a proper investigation. File too late — after you have already resigned or been dismissed — and you lose significant leverage.
The right time to file is when:
A pattern of behaviour has emerged and you have documented at least two or three specific incidents Informal attempts to resolve the matter have failed or were not taken seriously You are still employed — a grievance raised while in post carries more weight than one raised after the fact "I waited six months before filing," said Priya, a senior administrator whose concerns about discriminatory treatment were repeatedly brushed off. "By then I had dates, emails, and witnesses. My employer could not dismiss it as a misunderstanding. They settled before it reached a tribunal."
The Golden Rules of Writing Your Grievance
Stick to facts, not feelings. Every concern must be grounded in a specific incident — with a date, a location, who was present, and exactly what was said or done. Avoid language like "I felt undermined" and replace it with "On 14 March, in a team meeting attended by X and Y, my manager stated in front of colleagues that my work was not good enough, despite no prior feedback being given."
Reference policy and law. Where relevant, cite your employer's own policies — their dignity at work policy, their bullying and harassment policy, or their performance management framework. Where applicable, reference legislation: the Equality Act 2010, the Employment Rights Act 1996, or the ACAS Code of Practice.
State what you want. A grievance without a clear desired outcome is easy to dismiss. Be specific: you want a written apology, the behaviour to stop, a change in management arrangements, or access to a particular opportunity you were denied. Make the grievance actionable.
Keep it professional. Emotional language — however justified — gives the employer grounds to focus on your tone rather than your concerns. Write as if a judge will read it. Because one might.
What to Include
A well-structured formal grievance letter should cover:
Your name, job title, and the date A clear statement that this is a formal grievance under the ACAS Code of Practice A numbered list of specific incidents, each with dates and detail The policy or legal provision that has been breached The impact the situation has had on you — professionally and personally What outcome you are requesting A request to be informed of the next steps and the hearing date Keep a copy of everything you send, and send it via email so there is a timestamp and a delivery record.
The Grievance Hearing
Once your employer receives the grievance, they must invite you to a hearing within a reasonable timeframe. You have the legal right to be accompanied at this hearing by a colleague or a trade union representative.
Prepare for the hearing as you would for an interview. Know your key points. Bring your documentation. Stay calm — if you feel emotional, ask for a short break. Take notes throughout and request a copy of any notes your employer takes.
After the hearing, your employer must issue a written outcome. If you are not satisfied with the outcome, you have the right to appeal — and you should use it.
After the Grievance: What Comes Next
If your grievance is not resolved internally, you may have grounds to bring a claim at an Employment Tribunal. The time limit is strict: three months minus one day from the incident or the date your employment ended. Before filing a claim, you must first contact ACAS to begin Early Conciliation.
According to ACAS data, a significant proportion of employment disputes that reach Early Conciliation are resolved without going to tribunal — meaning a well-documented grievance, properly filed, often produces results even before a formal hearing takes place.
Your Action Plan
Document every relevant incident with dates, names, and exact details before writing anything Check your employer's own policies — dignity at work, bullying and harassment, performance management Write your grievance in factual, professional language — state what happened, what was breached, and what you want Send it in writing via email and keep a copy with the timestamp Attend the hearing accompanied by a colleague or union representative If the outcome is unsatisfactory, submit your appeal in writing within the deadline given Check whether your situation gives you grounds for a tribunal claim 👉 https://myredundancyrights.co.uk/legality-checker Understand your full rights before you act 👉 https://myredundancyrights.co.uk/my-rights Download your free step-by-step action plan 👉 https://myredundancyrights.co.uk/action-plan A grievance filed correctly is not just a complaint. It is a legal move. Make it count.