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Dunning Letter: The Complete Guide to Writing One (With Template & Legal Tips)
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August 19, 2025

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)

  1. Start with Your Contact Info – Include name, business, and address.
  2. Address the Recipient – Use full legal name and mailing address.
  3. State the Purpose Clearly – Example: “This letter is a formal demand for payment of $4,200 for products delivered on [date].”
  4. Detail the Debt or Breach – Include invoice numbers, amounts, or contract details.
  5. Set a Firm Deadline – Typically 7–14 days.
  6. Explain the Consequences – Small claims court, attorney involvement, or credit impact.
  7. 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.

View our free Dunning Letter template!

Melanie Albert

VP of Customer Success

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