Investigation Outcome Letters: Templates for Every Result

6/15/2026

The closure letter is the only part of the investigation the parties will see. It determines whether the complainant believes the process was fair, whether the respondent understands what was decided, and whether either of them concludes the organization did nothing.

Quick answer: Send written closure to both parties in every investigation. Tell the complainant the investigation concluded and that appropriate action was taken where warranted — without disclosing specific discipline imposed on another employee. Tell the respondent the finding and what happens next. Reiterate anti-retaliation protection to both.

What Every Closure Letter Contains

1. Confirmation that the investigation is complete
2. The scope of what was investigated, at a general level
3. The outcome, at the appropriate level of detail for that recipient
4. What happens next
5. The anti-retaliation statement
6. A named contact for questions or concerns
7. Date, and a copy retained in the investigation file

Template 1: Complainant — Substantiated

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Dear [Name],

Thank you for bringing your concerns forward on [date]. I am writing to let you know that our investigation is complete.

We interviewed [number] individuals and reviewed relevant documents and records. Based on that investigation, we determined that some or all of the conduct you reported did occur and that it violated company policy.

We have taken action that we believe is appropriate to address the conduct and prevent it from recurring. I am not able to share the specific action taken regarding another employee, but I want you to know the matter was substantiated and addressed.

Going forward, [describe any changes affecting the complainant — reporting structure, work arrangement, or that no changes to their role will occur].

Retaliation against you for raising this concern or participating in the investigation is prohibited. If you experience anything you believe may be retaliation, or if the conduct recurs, contact me immediately at [contact]. I will also check in with you in approximately 30 days.

I appreciate you coming forward. It was the right thing to do.

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Template 2: Complainant — Not Substantiated

This is the hardest letter to write well, and the one most often written badly. The goal is to be honest about the finding without implying the complainant lied.

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Dear [Name],

Thank you for bringing your concerns forward on [date]. I am writing to let you know that our investigation is complete.

We interviewed [number] individuals and reviewed relevant documents and records. Based on the information available to us, we were not able to determine that the conduct you described occurred in a way that violated company policy.

I want to be clear about what this means. This is not a determination that you were untruthful or that your concerns were unfounded. It means the evidence available did not allow us to reach a conclusion by the standard we apply.

We have taken the following steps in response to the concerns raised: [training, policy reminder, monitoring, or other measures].

Retaliation against you for raising this concern or participating in the investigation is prohibited. If you experience anything you believe may be retaliation, or if you have additional information or experience further concerns, contact me immediately at [contact]. I will check in with you in approximately 30 days.

I appreciate you bringing this forward.

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The third paragraph is essential and routinely omitted. Without it, "not substantiated" reads as "we decided you lied," which is the fastest route to an external charge.

Template 3: Complainant — Inconclusive

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Dear [Name],

Thank you for bringing your concerns forward on [date]. Our investigation is complete.

We interviewed [number] individuals and reviewed relevant documents. The accounts we received conflict, and we were not able to identify additional evidence that would allow us to resolve the conflict. As a result, we were not able to reach a determination either way.

This is not a finding that the conduct did not occur, and it is not a determination about anyone's truthfulness.

In response to the concerns raised, we have [describe preventive measures].

Retaliation is prohibited. If you experience anything you believe may be retaliation, or if you have additional information, contact me at [contact]. I will check in with you in approximately 30 days.

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Template 4: Respondent — Substantiated

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Dear [Name],

This letter concerns the investigation discussed with you on [date].

The investigation is complete. Based on the information gathered, we determined that [specific conduct] occurred and that it violated [specific policy section].

As a result, [state the action being taken, or reference the accompanying disciplinary document].

Going forward, we expect [specific behavioral expectations]. Further conduct of this nature may result in additional action up to and including termination of employment.

Retaliation against the individual who raised this concern, or against anyone who participated in the investigation, is strictly prohibited and will result in disciplinary action independent of this matter. This includes any attempt to determine who participated, and any indirect action through others.

You may submit a written response for your file if you wish. If you have questions, contact me at [contact].

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Template 5: Respondent — Not Substantiated

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Dear [Name],

This letter concerns the investigation discussed with you on [date].

The investigation is complete. Based on the information available, we did not find sufficient evidence to conclude that a policy violation occurred. No disciplinary action will be taken and no record of discipline will be placed in your personnel file.

Retaliation against the individual who raised the concern, or against anyone who participated in the investigation, is strictly prohibited. Employees have the right to raise concerns in good faith, and doing so is protected regardless of the outcome. Any retaliatory conduct will result in disciplinary action.

[Optional, where warranted: We are asking all members of the team to complete [training] as a general matter.]

If you have questions, contact me at [contact].

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The anti-retaliation paragraph is the most important part of this letter. An exonerated respondent is at high risk of feeling licensed to retaliate.

Language to Avoid

Do not write	Why
"Your complaint was found to be false."	Not substantiated is not false; this invites a defamation and retaliation claim
"You have been cleared of all wrongdoing."	Overstates an unsubstantiated finding and reads as vindication
"[Respondent] has been terminated."	Disclosing another employee's discipline creates privacy exposure
"This matter is now closed and should not be raised again."	Chills future reporting and reads as a threat
"We found your allegations to be exaggerated."	Editorial and inflammatory
Legal conclusions such as "no unlawful harassment occurred"	Findings should address policy, not legal standards
Detailed accounts of witness statements	Breaches confidentiality and exposes witnesses to retaliation

Delivery

• Deliver in person or by phone first, then follow in writing. A letter alone for an emotionally significant outcome reads as institutional indifference.
• Allow time for questions in the conversation.
• Keep the written version consistent with what you said verbally.
• Retain a copy in the investigation file, not the personnel file — except for disciplinary documents, which follow your normal process.
• Follow up at 30 and 90 days with the complainant and document each contact.

Frequently Asked Questions

Do we have to tell the complainant the outcome?

Best practice is yes, at a general level. Some jurisdictions and policies require it. Silence is the most common reason complainants escalate externally.

Can we tell the complainant what discipline was imposed?

Generally you should not disclose specific discipline imposed on another employee. Confirm that the matter was substantiated and appropriate action was taken.

Should the letter include the full findings?

No. Provide the conclusion at an appropriate level of detail. The full report goes to decision-makers.

What if the complainant disagrees with the outcome?

Explain the standard applied and invite new information. Note their disagreement in the file. Do not reopen without a substantive basis, and do not treat disagreement as misconduct.

Do we send a letter if the complaint was resolved through coaching?

Yes — a brief confirmation that the concern was addressed, with the anti-retaliation statement. Closing the loop matters regardless of the path.

Closure Is Part of the Investigation

An excellent investigation communicated badly reads to the parties as no investigation at all.

The Internal Investigations Certificate Program covers findings, communication, and closure. For complex matters, see the Advanced Internal Investigations Certificate Program.

👉 See the Workplace Investigation Training Program →

Additional resources: How to Write an Investigation Report | Workplace Investigations FAQs | Workplace Investigation Confidentiality Rules