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

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

There is no special format for a certified letter, which is why this certified letter template is short. "Certified" describes how you mail it, not how you write it. USPS Certified Mail is an extra service you buy at the counter or online; it gives you a mailing receipt and keeps a delivery record with the recipient's signature. The letter inside can be one page in plain business format.

What the letter needs is precision, because the point of sending it certified is that someone may read it later to decide who did what and when. Six elements do that work:

• Your name and mailing address, so the response has somewhere to go.
• The date, which the receipt and delivery record will be measured against.
• 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, so the record shows what was sent with the letter.

Everything else is optional. You do not need to write "Certified Mail" inside the letter to get the service, though many people add a line under the date for their own file copy.

The template#

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

Keep it to one page where you can. State facts, not feelings. If the letter has to satisfy a statute, a lease clause, or a contract's notice provision, match that wording exactly and confirm the required delivery method; a general template does not replace a notice requirement.

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. "I vacated 412 Elm Street, Unit 3, on July 31 and returned the keys that day. Under the lease dated August 1 of last year, my $1,800 security deposit was to be returned or itemized within the period required by state law. As of today I have received neither. I request that you return the full deposit, or send an itemized statement of any deductions with supporting receipts, within 14 days of the date of this letter. A copy of the move-out inspection form signed by your property manager is enclosed."

Cancellation of a service contract. "This letter is my written notice to cancel account 55-2210 effective at the end of the current billing period. Section 9 of the agreement permits cancellation with 30 days' written notice; this letter provides that notice. Please stop all automatic charges to the card on file after that date and send written confirmation of the cancellation to the address above. If any early termination fee applies, itemize it in your reply before charging it."

Dispute of a debt with a collection agency. "I dispute the debt referenced in your notice dated March 3, reference 8871-A. I request that you provide verification of the debt, including the name of the original creditor and an itemized balance, and that you stop collection activity until you have done so. Please send all further communication in writing to the address above." Send a dispute like this within the window stated on the collector's validation notice; the Consumer Financial Protection Bureau explains the timing and your rights.

Notice what the three have in common: a date the reader can check, a reference number, one clear request, and a deadline. That is the whole craft.

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 alone gives you a mailing receipt and, on request, electronic verification that the letter was delivered or that delivery was attempted. USPS keeps the signed delivery record. Return Receipt is how you get a copy of that signature for your own file, either as an emailed record or as the green card mailed back to you. If a lease, statute, or opposing party will want to see the signature, buy Return Receipt; if you only need to prove you mailed it and it arrived, the basic service is enough. 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 proves that a letter was mailed on a date and that it was delivered, or that USPS tried to deliver it, to an address. It does not prove what was inside the envelope; your file copy does that. It does not make a letter legally sufficient; the wording and the delivery method have to match whatever rule applies. And it does not force anyone to accept the letter.

That last point matters. If the recipient is not home, USPS leaves a notice and holds the letter at the Post Office for 15 days before returning it. A letter that is refused or never picked up comes back to you marked accordingly. In many settings the attempt itself is what counts, but not always; 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 travels at First-Class speed. It is handled as ordinary mail in transit, so paying the fee does not get the letter there 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 (PS Form 3800) with the tracking number, stamped by the clerk or printed by your postage software.
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.

Add the tracking number to the "Sent via USPS Certified Mail No." line on your file copy. When the question comes up months later, one folder answers it. The guide to Certified Mail as evidence explains what courts and agencies expect to see.

When you do not need Certified Mail#

Plenty of important letters do not require a signature record. A payment reminder, a change-of-address notice, a records request, or a first polite complaint usually needs only proof that you sent it and a record of when. First-Class Mail with your own dated file copy covers that, at a fraction of the cost.

Postmarkr sends First-Class letters online: upload the PDF, enter the address, and the letter is printed, mailed, and tracked through processing milestones in your dashboard, from $2.05 per letter. Certified Mail is not currently available through Postmarkr, so a letter that needs the USPS signature record still goes through USPS or a certified-mail provider. For everything else, send the letter online and keep the trip to the Post Office for the ones that need the green card. The Certified Mail guide helps you decide which letters those are.

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.