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Dunning Letter: The Complete Guide to Writing One (With Template & Legal Tips)
When a customer owes you money or fails to fulfill a contract, a dunning letter is often the most effective first step.
What is a Dunning Letter?
A dunning letter is a formal written notice demanding payment or corrective action. It is usually sent before escalating to small claims court or hiring a debt collection attorney.
A strong dunning letter includes:
- The amount owed or nature of the dispute
- A specific deadline for payment or action
- The consequences if the issue is ignored
By sending a dunning letter, you establish a paper trail, demonstrate seriousness, and often resolve disputes without expensive lawsuits.
Purpose of a Dunning Letter
The main purpose of a dunning letter is to serve as a final reminder before escalating debt collection efforts. Businesses and individuals use them to:
- Recover unpaid invoices
- Enforce contract obligations
- Avoid costly legal battles
- Show good faith before filing a claim
Benefits of Sending a Dunning Letter
Sending a dunning letter has multiple benefits:
- Encourages Quick Resolution – Many recipients pay immediately to avoid legal escalation.
- Saves Time & Money – Faster and cheaper than going to court.
- Creates a Legal Record – Serves as evidence if the case goes to trial.
- Demonstrates Professionalism – Shows you’re serious about debt recovery.
- May Be Legally Required – Some states require a dunning letter before small claims.
Legal Considerations
Before writing a dunning letter, ensure compliance with laws such as the Fair Debt Collection Practices Act (FDCPA).
- Do not use threats or harassment.
- Keep the tone professional and factual.
- Reference the relevant contract or invoice.
- Always maintain proper documentation.
How to Write a Dunning Letter (Step-by-Step)
- Start with Your Contact Info – Include name, business, and address.
- Address the Recipient – Use full legal name and mailing address.
- State the Purpose Clearly – Example: “This letter is a formal demand for payment of $4,200 for products delivered on [date].”
- Detail the Debt or Breach – Include invoice numbers, amounts, or contract details.
- Set a Firm Deadline – Typically 7–14 days.
- Explain the Consequences – Small claims court, attorney involvement, or credit impact.
- Sign & Send – Use certified mail with a return receipt.
What to Include in a Dunning Letter
Every dunning letter should include:
- Identification of the debt or dispute
- The total balance owed (including late fees/interest)
- A clear request for payment or action
- A specific deadline for compliance
- Next steps if ignored (lawsuit, collection, legal costs)
How to Send a Dunning Letter
- Certified Mail with Return Receipt – Provides legal proof of delivery.
- Keep Copies – Store both digital and paper versions.
- Escalate if Ignored – Move to small claims court or legal collection if necessary.
What Happens If the Recipient Ignores the Dunning Letter?
If your dunning letter is ignored, next steps include:
- Filing in small claims court
- Hiring a debt collection attorney
- Reporting the delinquency to credit bureaus
Should You Hire an Attorney?
While you can write a dunning letter yourself, an attorney can help if:
- The debt is large
- The case is complex
- You anticipate legal resistance
Filing a Small Claims Case After a Dunning Letter
If your dunning letter is unsuccessful, small claims court is often the next logical step. This process is designed for faster, lower-cost resolution of disputes under a financial threshold (varies by state).
Key Takeaways
- A dunning letter is a powerful tool for debt recovery.
- Include the amount owed, deadline, and legal consequences.
- Send via certified mail for proof.
- Escalate to small claims or an attorney if ignored.
Final Thoughts
A dunning letter is a low-cost, highly effective way to collect overdue payments or enforce contract terms. By writing a professional letter and sending it properly, you increase your chances of resolving disputes quickly—without immediately resorting to court.

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