How to Respond to a Complaint About an Employee

A complaint about an employee is one of the most mishandled moments in a small business, because it usually lands on a manager who has never been trained for it and who wants the discomfort to go away. How you respond in the first 48 hours shapes whether this stays a manageable issue or becomes a legal one.

This is the manager's-eye view: what to do when someone comes to you about a coworker.

Step 1: Listen, and take it seriously

Let the person tell you what happened without interrupting or minimizing. Do not react visibly, take sides, or promise a specific outcome ("I'll fire him"). Your job in this moment is to receive the information neutrally and signal that you take it seriously. Get the specifics: what happened, when, where, who was involved, and whether anyone else saw it.

The most damaging first response is the dismissive one: "I'm sure it's a misunderstanding." Even if it is, that reaction tells the complainant the company will not protect them, and it is the kind of thing that later reads badly in a legal record.

Step 2: Document it the same day

Write down what you were told while it is fresh, in factual language: who said what, the dates and details, your response. This is not bureaucracy; it is protection for everyone, including you. If the situation escalates, the contemporaneous note is what shows the complaint was taken seriously and handled properly.

Step 3: Decide if it needs a formal investigation

Some complaints require a formal, documented investigation, no exceptions:

Harassment or discrimination of any kind
Safety violations or threats
Anything potentially illegal (wage theft, retaliation, fraud)

Lower-level interpersonal friction can sometimes be handled more informally, but you still document it. When you are unsure which category you are in, treat it as the more serious one.

Step 4: Protect the complainant from retaliation

This is where small businesses create their biggest legal exposure without realizing it. Retaliation is any adverse action against someone for raising a good-faith complaint, and it is independently illegal even if the complaint turns out to be unfounded. While you investigate, change nothing about how the complainant is treated, scheduled, or reviewed, and document that nothing changed.

Step 5: Address it with the employee fairly

The subject of the complaint has rights too. They get to hear the substance of the concern and respond before any conclusion is reached. Keep it factual, avoid disclosing more than necessary about who complained, and base any outcome on what the investigation actually found, not on who complained more loudly. This is also where a fair, consistent process protects you: if discipline follows, it should look like discipline you have applied to similar situations before. (Related: how to fire someone without getting sued.)

What not to do

Do not promise confidentiality you cannot guarantee.
Do not retaliate, or let anyone else.
Do not decide the outcome before investigating.
Do not handle a harassment or discrimination complaint casually.
Do not skip the documentation.

The bottom line

Responding to a complaint about an employee is a process, not a reaction: listen, document, investigate fairly, prevent retaliation, and base the outcome on facts. If you are facing one involving harassment, discrimination, or real legal risk, getting an experienced HR investigator involved protects everyone, including the business. (For the complaint-process side, see handling an employee complaint.)

Frequently asked

What should a manager do first when someone complains about an employee?

Listen fully, stay neutral, and take it seriously without promising an outcome. Get the specifics: what happened, when, who was involved, whether anyone witnessed it. Then document the conversation in writing the same day. Do not react, retaliate, or share the complaint more widely than necessary.

Should I tell the employee who complained about them?

Not immediately, and not always by name. You generally need to address the behavior with the employee, but how much you reveal depends on the situation and any confidentiality you can reasonably maintain. Promising total anonymity is risky because the subject can often guess; promising it and failing is worse. Get HR guidance before naming a complainant.

When does a complaint require a formal investigation?

Any complaint involving harassment, discrimination, safety, or potential legal violations should trigger a formal, documented investigation. Lower-level interpersonal complaints may be handled more informally, but document them either way. When in doubt, investigate.

What is retaliation and how do I avoid it?

Retaliation is any adverse action against someone for raising a good-faith complaint: reduced hours, exclusion, a sudden bad review, termination. It is independently illegal even if the original complaint is unfounded. Avoid it by changing nothing about the complainant's treatment while you investigate, and documenting that you did.

Should a small business handle complaints internally or get outside help?

Minor issues can be handled internally if a manager is trained. But anything involving harassment, discrimination, or potential legal exposure benefits from an experienced HR investigator, both for fairness and because the documentation has to hold up. Many small businesses use fractional HR for exactly this.