Sample Letter for Complaint About Employee: Guide, Templates & Proper Workplace Etiquette

Nobody likes filing a workplace complaint. But when an employee’s behaviour harms safety, morale or productivity, ignoring the issue only makes things worse. A properly structured Sample Letter for Complaint About Employee removes emotion, keeps records clear, and ensures your concern gets taken seriously.

Many people avoid formal complaints because they don’t know what to write. Vague verbal complaints rarely lead to real change. Written documentation creates an official record, protects everyone involved, and gives management clear facts to act on. This guide covers everything you need to submit a professional, effective complaint.

Why A Formal Written Complaint Matters

A Sample Letter for Complaint About Employee is not just a form to fill out. It is a formal record that will be kept in personnel files, referenced during investigations, and used if further action is required. Using a standard, professional letter format is the single best way to make sure your complaint is treated with the appropriate level of seriousness.

Before you write, confirm these basics first:

• You have first-hand knowledge of the issue
• You have attempted informal resolution where safe
• You have dates, times or witnesses for incidents
• You understand your company's official complaint policy

Avoid these common mistakes when drafting your letter:

Sample Letter for Complaint About Employee: Repeated Tardiness & Absence

Subject: Formal Complaint Re: James Carter, Sales Associate

Dear Manager Sarah Lopez,

This letter is a formal complaint regarding James Carter’s consistent attendance issues over the last 6 weeks.

Between 12th March and 23rd April 2025, James arrived over 45 minutes late on 8 separate occasions, and took 3 unapproved sick days with zero prior notice.

This has required other team members to cover his client calls at short notice, creating extra workload and missed deadlines. I request this pattern be addressed formally.

Regards,
Mia Reed, Senior Sales Associate

Sample Letter for Complaint About Employee: Workplace Safety Violations

Subject: Safety Complaint Re: Tyler Moore, Warehouse Operative

Dear Health & Safety Manager,

I am writing to formally report repeated unsafe behaviour from Tyler Moore on the night warehouse shift.

On three separate shifts this month, I observed Tyler operating the forklift without wearing the required safety harness, and blocking emergency fire exits with pallets.

This behaviour puts every worker on shift at risk. I request an immediate investigation and corrective action.

Signed,
Raj Patel, Warehouse Shift Lead

Sample Letter for Complaint About Employee: Unprofessional Client Conduct

Subject: Complaint Re: Chloe Bennett, Account Manager

Dear Department Head,

On 18th April I sat in on the client call with Global Tech where Chloe Bennett used inappropriate language and argued openly with the client project lead.

Following this call, the client contacted me directly to state they are considering ending their contract. This behaviour violates our client service standards.

I request this incident be reviewed and documented.

Regards,
Owen Graham, Client Success Director

Sample Letter for Complaint About Employee: Failed Work Duties

Subject: Performance Complaint Re: Leo Hughes

Dear Team Manager,

For the last three monthly reporting cycles, Leo Hughes has failed to submit his required team data on time, every time.

Each delay has pushed back the full department report, resulting in senior management receiving late updates on two occasions.

I am requesting formal performance management be initiated for this role.

Regards,
Jenna Walsh, Reporting Coordinator

Sample Letter for Complaint About Employee: Coworker Bullying Behaviour

Subject: Formal Bullying Complaint

Dear HR Representative,

I am submitting this formal complaint regarding ongoing belittling and hostile behaviour from Ruby Evans in our design team.

Over the last month, Ruby has publicly mocked my work in team meetings, hidden project files I need, and made dismissive comments about me to other team members.

I have attempted to speak to Ruby directly with no change. I request mediation and formal review.

Signed,
Luna Chen, Junior Designer

Sample Letter for Complaint About Employee: Misuse Of Company Property

Subject: Complaint Re: Unauthorised Company Vehicle Use

Dear Operations Manager,

On 21st April I observed Kyle Reed taking the company van outside of work hours for personal use, on two separate evenings.

This is a clear violation of company vehicle policy. Fuel costs and wear are being charged to the business for private trips.

I request this matter be investigated and logged.

Regards,
Tom Grant, Fleet Administrator

Sample Letter for Complaint About Employee: Workplace Harassment

Subject: Confidential Formal Harassment Complaint

Dear HR Confidential Line,

This is a formal, confidential complaint regarding unwanted advances and comments made by Mark Henderson at the team social event on 12th April.

There was one witness to this incident who has agreed to give a statement. I do not feel safe working in the same space as this employee.

I request immediate action per the company anti-harassment policy.

Signed,
Confidential Complainant

Frequently Asked Questions about Sample Letter for Complaint About Employee

Should I send this complaint letter by email or printed paper?

Send both an emailed copy and a signed printed copy. Email creates an immediate timestamp, while a signed physical copy is recognised as an official formal document. Always keep a personal copy for your own records.

Can I submit an anonymous employee complaint letter?

Most companies will investigate anonymous complaints, but action is far less likely. Without a named complainant, management cannot follow up for extra details or witness statements. Only submit anonymously if you feel unsafe being identified.

What details do I absolutely need to include?

Always include exact dates, locations, what happened, and any witnesses. Never include opinions, insults or assumptions. Stick only to facts that you directly observed yourself.

How long should a complaint letter be?

An effective complaint letter is 150-300 words long. Stick only to the relevant issue, do not include unrelated past problems. Managers and HR staff handle dozens of messages daily, so brevity gets attention.

Do I need proof to file an employee complaint?

You do not need definitive proof to submit a complaint. You should include whatever evidence you have, such as screenshots, emails or witness names. The company will conduct the formal investigation to verify claims.

Who should I send the complaint letter to?

Send the letter first to your direct manager, unless the complaint is about them. If that is the case, send it directly to HR or the next level manager. Always follow the exact complaint process listed in your employee handbook.

Can I get in trouble for filing a workplace complaint?

It is illegal in most regions for an employer to retaliate against you for making a good faith formal complaint. Always keep copies of all correspondence to protect yourself if issues arise.

When should I write a formal letter instead of talking in person?

Use a formal letter if the issue is serious, if informal talks did not work, or if you need an official record. For small one-off issues, an informal conversation is still usually the best first step.

Every one of these sample letters is built to be fair, factual and professional. No matter how upset you may feel, approaching complaints this way gives you the best chance of a fair resolution, and protects everyone involved from unnecessary conflict. Always keep your own copy of every letter you submit, and follow up after three working days if you receive no response.

You can adapt any of the templates on this page for your specific situation. Replace the example details with your own facts, remove any lines that don't apply, and double check you have stuck only to observable events. If you found this guide useful, share it with coworkers who may need support navigating workplace issues properly.