How to Write a Certified Letter (Format & Examples)

A certified letter is a normal business letter sent with USPS Certified Mail. The letter should be clear and factual; the service creates the tracking and proof record.

How to Write a Certified Letter

Write a certified letter in standard business-letter format. State your reason and requested action clearly, send copies instead of originals, and keep the letter and mailing receipt for your records.

Certified Mail is our most popular service here at The Letter Pilot. Our dashboard gives you a clean way to track your mailings and keep everything in one place. It saves your mailing proof, tracking information, and electronic Return Receipt if you choose that option instead of the physical Return Receipt. We see a lot of debt disputes and legal documents sent this way. Certified Mail is generally used when you need proof that something was mailed.

The Letter Pilot dashboard showing mailing statuses, tracking information, and downloadable proof documents — The Letter Pilot dashboard keeps the mailing status, tracking history, Proof of Mailing, and electronic Return Receipt in one place.

Unfortunately, we’ve also had to send Certified Mail ourselves. We’ll share that experience a little later in this guide as an example of how to write and send a certified letter.

If you need a starting point, use our certified letter template. Once your letter is ready, you can send it by Certified Mail online through The Letter Pilot.

Certified Letter Format

Certified Mail doesn’t require a special letter format, but you’ll usually want to format it as described below. If you’re sending an important letter, I recommend following this format and the example that follows.

Return address
Add your full name and mailing address.
Date
Add the date you are sending the letter.
Recipient address
Use the exact name and address that will appear on the envelope.
Subject line
This is optional, but useful for account numbers, claim numbers, notices, or deadlines.
Body
State the relevant facts, the action you want taken, and any response deadline.
Closing and signature
Sign the letter and provide your contact information.
Enclosures
If you are including documents, list them at the end of the letter.

Certified Letter Example

Jane Doe
123 Main Street
Springfield, IL 62704

June 24, 2026

ABC Claims Department
456 Elm Avenue
Chicago, IL 60601

RE: Claim #12345 – Request for Written Review

To Whom It May Concern:

I am writing regarding the claim referenced above. Please review the enclosed documents and respond in writing by July 15, 2026.

I have enclosed copies of the notice, supporting records, and prior correspondence. Please send your response to the mailing address listed above.

Sincerely,


Jane Doe
(555) 555-5555
jane@example.com

Enclosures: Notice, supporting records, and prior correspondence

Certified Letter Template

Copy this certified letter template and replace the bracketed text with your information. Remove the enclosure line if you are not including any documents.

[Your name]
[Street address]
[City, State ZIP]

[Date]

[Recipient name or department]
[Recipient street address]
[City, State ZIP]

RE: [Account, claim, case, or subject]

Dear [Recipient name]:

I am writing regarding [briefly identify the issue]. [State the relevant facts in date order].

Please [state the exact action you want]. Please respond in writing by [deadline, if applicable].

I have enclosed copies of [list the documents]. Please send your response to the mailing address above.

Sincerely,


[Your name]
[Phone number]
[Email address]

Enclosures: [List documents, if any]

You can also start with our certified letter template and fill it out online.

Sample Wording for Common Situations

Keep the wording direct. Explain what happened, what you want the recipient to do, and when you need a response.

Requesting a correction or action

Please correct the account and send written confirmation to the mailing address above by [date].

Disputing a debt

I dispute this debt and request validation, including the amount owed and the name of the original creditor.

Ending an agreement

This letter provides notice that we are terminating the agreement dated [date] because [brief reason].

Sending supporting records

Enclosed are copies of [documents]. Please confirm receipt and respond in writing by [date].

When to Send a Letter by Certified Mail

Certified Mail is mostly useful when you need proof that you sent a letter and that delivery was made or attempted.

Recently, we had a dispute with a management company we had hired. We had to terminate the contract because its actions risked harming another business. We needed to notify the company that it was in breach, so our attorney drafted a letter ending the contract. Our attorney sent the letter through The Letter Pilot using Certified Mail with Return Receipt, giving us proof of mailing and a signed delivery record.

If you choose electronic Return Receipt, the completed receipt is saved with the mailing in your dashboard once USPS provides it. If you choose the physical Return Receipt instead, USPS mails the green card back to you.

Redacted USPS electronic Return Receipt showing delivery details and the recipient signature — A redacted USPS electronic Return Receipt showing the delivery details and recipient signature saved with the mailing.

Below are some good examples of when to send Certified Mail:

IRS and tax responses

Use it for deadline-sensitive IRS responses and other important tax correspondence.

Debt and collection disputes

Use it for debt validation requests, collection disputes, and stop-contact letters.

Debt validation letter template

Demand letters and legal notices

Use it for payment demands, breach notices, and letters sent before legal action.

Demand letter template

Insurance appeals and claims

Use it for claim appeals, denial responses, and supporting documents when proof of receipt matters.

Landlord and tenant notices

Use it for lease termination, repair requests, deposit disputes, and notices to vacate.

Notice to vacate template

Business and account notices

Use it for contract termination, vendor disputes, past-due notices, and formal account changes.

Past-due notice template

What to Keep After Mailing

A copy of the signed letter and every enclosure.
The Certified Mail receipt or electronic mailing record.
The tracking number and USPS delivery or attempted-delivery record.
The Return Receipt, if purchased.

FAQs

Do I need a special format for a certified letter?

No. Use a normal business-letter format. Certified Mail is the USPS service that provides a mailing receipt and tracking record.

Should I include a subject line?

It’s optional, but useful for identifying notices, accounts, claims, contracts, and deadlines.

Should I send originals or copies?

Send copies unless the recipient specifically requires originals. Keep the originals and a copy of everything you mail.

Can I send a certified letter online?

Yes. Upload your letter, and The Letter Pilot will print and mail it with USPS Certified Mail tracking.

When your letter is ready, you can upload the PDF and send it by Certified Mail through The Letter Pilot. We handle printing, postage, USPS preparation, and tracking.

Sources

USPS Domestic Mail Manual 503: Certified Mail records, PS Form 3800, and Return Receipt requirements.
USPS Certified Mail and Return Receipt: Proof of mailing, delivery attempts, and signature records.
Purdue OWL: The Basic Business Letter: Standard business-letter structure and formatting.
IRS Audit Reconsideration Guidance: Keeping copies and using Certified Mail when proof of delivery matters.
CFPB Debt Validation Information: Written debt disputes and validation rights.

Read guide

How to Write a Certified Letter

Certified Letter Format

Return address

Date

Recipient address

Subject line

Body

Closing and signature

Enclosures