Investigating a Harassment or Discrimination Complaint From a Poor Performer

12/13/2025

A harassment or discrimination complaint from an employee with documented performance problems must be investigated exactly as any other complaint would be. The timing, which is often just as a performance improvement plan or discipline gets under way, does not make the complaint less worthy of investigation, and treating it as a tactic is the quickest route to a retaliation claim. The practical challenge is running two tracks at once: a fair investigation of the complaint, and a performance process that stays defensible because it clearly began, and continues, for legitimate reasons.

Why These Complaints Arrive When They Do

HR teams see the pattern often enough to grow skeptical. An employee is told their work is falling short, and within days they allege that their manager has been harassing them or treating them differently because of a protected characteristic.

There are several explanations, and only one of them is bad faith. Some employees raise concerns only when their job is at risk, because that is when the cost of silence becomes obvious. Some performance problems are themselves the product of the treatment being complained about: an employee who is excluded, undermined or harassed often does worse work. And some complaints are strategic. The investigation exists to find out which it is. Whoever receives the complaint should not decide in advance.

Why the Complaint Must Be Investigated Anyway

• Merit is unknown at intake. Poor performance and genuine mistreatment are not mutually exclusive.
• The employer's defense depends on it. In harassment cases, an employer's ability to defend itself often turns on whether it responded promptly and effectively once it knew of the problem. A complaint set aside because of the complainant's record undermines that defense.
• Complaining is protected activity. Raising a good-faith complaint of discrimination or harassment is generally protected under federal anti-discrimination laws even if the complaint is not ultimately substantiated.
• Everyone is watching. Other employees learn from how complaints are handled whether it is safe to raise one.

Keep the Performance Process and the Investigation Separate

The two processes should run on separate tracks, with separate decision-makers wherever possible.

• Remove the accused manager from decisions about the complainant. If the complaint concerns the supervisor who is running the performance plan, another manager or HR should take over evaluations and any discipline decisions until the investigation is complete.
• Audit the performance record before acting on it. Establish what documentation existed before the complaint: dated reviews, written warnings, emails, productivity data. Anything created after the complaint will be scrutinized closely.
• Do not accelerate. Pulling a review date forward, adding new goals to a plan, or jumping from coaching to a final warning shortly after a complaint is exactly the pattern that suggests a causal connection.
• Do not abandon legitimate management either. A complaint does not suspend the employee's obligations. Freezing a performance process indefinitely makes the employer's standards look negotiable and later decisions look inconsistent. A common approach is a short, documented pause of scheduled milestones, decided by HR and applied neutrally, while the investigation is given priority.

Watch for Retaliation While the Investigation Runs

Consider a manager who moves a complainant from a day shift with weekends off to overnights with Tuesdays and Wednesdays off, shortly after the employee complained to HR. Even if the manager can point to a staffing reason, the timing invites an inference that the change was connected to the complaint.

If the employee raises a retaliation concern during the investigation, treat it as a new allegation. Establish when the change was decided, by whom and why, whether the decision-maker knew of the complaint, and whether similar changes were made to employees who had not complained. The stronger the apparent causal connection, the greater the risk, and the faster the change should be reviewed. Our guides on investigating retaliation claims and what counts as workplace retaliation go into the elements in more detail.

Interim Measures: Protect Without Punishing

Sometimes the people involved need to be separated while the facts are gathered. The rule of thumb is that interim measures should not leave the complainant worse off.

• Move the accused, not the complainant, where possible: change reporting lines, have another manager handle day-to-day supervision, or in serious cases place the accused on paid administrative leave pending the outcome.
• Be careful with complainant leave or transfers. Placing the complainant on leave, transferring them or changing their shift, even with full pay, can be seen as punishment for complaining. Do it only if the employee asks for it or clearly agrees, and document that.
• Put the no-retaliation instruction in writing to the accused, the complainant's managers and witnesses, and tell the complainant how to report any retaliation.

Assess Credibility Without Prejudging

A weak performance record is not evidence that a complaint is false. Assess credibility the same way in every investigation:

• Is each account internally consistent and specific?
• Is it corroborated by witnesses, documents, messages, schedules or system records?
• Is it plausible given how the workplace actually operates?
• Does anyone have a reason to shade their account?
• Is there a history of similar complaints about the accused?

Motive cuts both ways. A complainant facing discipline has a reason to deflect; a manager facing an allegation has a reason to deny. Note both, and let the evidence decide. Our article on bias in workplace investigations covers the traps that lead investigators to reach conclusions early.

Document Both Tracks, Separately

Keep the investigation file (interview notes, evidence, findings) apart from the personnel and performance file. Cross-reference dates where the timeline matters, but do not merge the two. When the case is reviewed later, the separation shows the processes were independent. For how to build and secure the investigation file, see documenting evidence in a workplace investigation.

Closing the Investigation and Resuming Performance Management

• Communicate the outcome to the complainant in general terms, and remind them how to report any further concerns.
• If the complaint is substantiated, take corrective action, and ask whether the conduct affected the performance record. An independent reassessment by a different manager is often sensible.
• If it is not substantiated, resume the performance process with a neutral decision-maker, restore any time that was paused, and document the business reasons for each step.
• "Not substantiated" does not mean "made in bad faith." Discipline for a false complaint should be reserved for clear evidence that it was knowingly false, and reviewed by counsel first.

Frequently Asked Questions

Can we continue a performance improvement plan during the investigation?

Often yes, if the plan was documented before the complaint and a neutral decision-maker takes it over. What creates risk is accelerating it, changing its terms or leaving the accused manager in charge of it.

Should the complainant be placed on administrative leave?

Generally only if they request it or clearly agree. Removing the complainant from work can look like punishment for complaining. Adjusting the accused manager's role is usually the safer interim step.

What if the complaint looks like a tactic to avoid discipline?

Investigate it anyway, on the same standard as any other complaint. If the evidence does not support it, the investigation record is what allows the performance process to resume on solid ground.

Who should run the investigation?

Someone with no role in the performance process and no reporting relationship to the accused. Where the complaint involves senior leaders or HR itself, consider a third-party investigator.

Related Reading and Training

• Internal Investigations Certificate Program
• Online internal investigation training and certification course
• What is workplace retaliation?
• Documenting evidence in a workplace investigation