Certified Letter Template: What to Write and How to Send It (2026)

A certified letter is an ordinary letter with a paper trail#

"Certified" describes how you mail a letter, not a special writing format. USPS Certified Mail provides a mailing receipt and a record of delivery or attempted delivery. Start with the business-letter template below, then check any content and delivery requirements that apply to your notice.

The template#

Copy the block below, replace every bracket, and delete any line you do not need.

Keep the letter concise and factual. For a notice governed by a statute, lease, or contract, confirm its required content, timing, recipient, and delivery method before using the template. If you have the Certified Mail number before you seal the envelope, add it on the "Sent by" line; otherwise, write it on your retained copy after mailing.

What to include in your letter#

Use these six elements to make the facts and your request easy to follow:

• Your name and mailing address, so the response has somewhere to go.
• The date you wrote the letter. Keep the mailing and delivery dates separately in your records.
• The recipient's name and address, written exactly as it will appear on the envelope.
• A subject line with the account, lease, order, or case number.
• The facts and the request: what happened, what you want, and by when.
• A list of enclosures, matched to the copies you retain.

You do not need to write "Certified Mail" inside the letter to buy the service. After mailing, add the tracking number to your retained copy and file it with the mailing receipt.

Three worked examples#

Each example below is fictional and shows only the body of the letter. The header, subject line, and closing come from the template.

Security deposit demand to a former landlord. Assume the applicable state deadline for the refund and accounting has passed. The 14 days below is the sender’s requested response period, not a statement of the legal deadline. "I vacated 412 Elm Street, Unit 3, on July 31 and returned the keys that day. My security deposit was $1,800. As of today I have received neither a refund nor an itemized statement. Please return any balance owed and provide an itemized explanation of any deductions, with supporting documentation, within 14 days of this letter. A copy of the move-out inspection form signed by your property manager is enclosed."

Cancellation of a service contract. Assume this fictional agreement permits cancellation with at least 30 days’ written notice received by the provider, and the provider receives the letter on October 1. "Please cancel account 55-2210 effective November 30. Section 9 of our agreement requires at least 30 days’ written notice. Please confirm the effective date in writing, explain any final charges, and stop automatic billing for service after cancellation." Choose dates that satisfy your actual agreement.

Dispute of a debt with a collection agency. Check the dispute deadline on the collector’s validation notice before using this example. The CFPB explains that sending a written dispute within 30 days of receiving the validation notice requires the collector to pause collection until it sends verification responding to the dispute. Read the CFPB’s explanation of the dispute deadline (opens in new tab) first. "I dispute the debt referenced in your notice dated March 3, reference 8871-A. I request verification of the debt, the name of the original creditor, and an itemized balance. I am submitting this dispute within the validation period. Please pause collection until you send verification responding to my dispute." Use the sentence about the validation period only if it is true.

Each example uses specific facts and a concrete request. Check notice periods and legal deadlines separately; a response date you request does not change the governing rule.

What it costs to send Certified Mail in 2026#

Certified Mail is a fee on top of First-Class postage. For a standard letter up to 1 oz mailed with stamps, the totals effective July 12, 2026 are:

Certified Mail gives you a mailing receipt and, on request, electronic verification of delivery or attempted delivery. USPS retains the signed delivery record. Purchase Return Receipt if you want that delivery record, including the signature, sent to you electronically or by mail. The records you need depend on the purpose of your letter and any applicable notice requirements. The Certified Mail cost guide covers heavier letters, metered postage, and Restricted Delivery.

At the counter, you fill out PS Form 3800, the receipt with the tracking number. The PS Form 3800 walkthrough shows each box.

What Certified Mail proves, and what it does not#

Certified Mail records mailing and delivery activity, not the envelope’s contents. Keep an exact copy of the signed letter and enclosures to support your record of what you sent. These records do not by themselves establish that a notice meets legal requirements, and the service does not force anyone to accept the letter.

If USPS cannot obtain the required signature, it may leave a pickup notice. Unclaimed Certified Mail is generally held for 15 days before being returned; a refusal can lead to an earlier return. Do not assume an attempted delivery satisfies your notice requirement. The guide to refused and unclaimed Certified Mail explains what to do next. Sending to a PO Box works, with the same pickup caveat, as covered in Certified Mail to a PO Box.

Certified Mail follows the delivery speed of the underlying mail class: First-Class Mail or Priority Mail. Adding Certified Mail does not make delivery faster.

Keep the file that makes the letter useful#

The letter is only half the evidence. Before you seal the envelope, assemble the rest:

1. A copy of the signed letter and every enclosure, exactly as mailed.
2. The mailing receipt with the tracking number. At a USPS counter, ask the clerk to postmark the receipt to document acceptance. A label printed at home does not by itself show that USPS accepted the letter.
3. The tracking history, saved as a PDF once delivery shows, since online tracking does not stay available forever.
4. The Return Receipt, if you bought one, filed with the letter.

After mailing, add the tracking number to your retained copy and keep the related records together. The guide to Certified Mail as evidence explains what courts and agencies expect to see.

When you do not need Certified Mail#

For routine correspondence that does not require a mailing or delivery record, ordinary First-Class Mail may be sufficient. Keep a copy for your records. A dated copy is not a USPS acceptance record. If you need official evidence of mailing, USPS offers a separate Certificate of Mailing (opens in new tab); it does not provide a delivery record.

Postmarkr sends First-Class letters online: upload the PDF, enter the address, and the letter is printed and mailed, with processing milestones in your dashboard, from $2.05 for a one-page black-and-white letter. Certified Mail is not currently available through Postmarkr. For routine correspondence that does not need those USPS extra services, you can send the letter online. For help choosing the mailing service and records you need, read the Certified Mail guide.

This page is general information about writing and mailing a letter, not legal advice. For a notice with legal consequences, confirm the required content, timing, and delivery method with an attorney or the governing rule.