The short answer
Certified Mail gives you a mailing receipt and delivery or attempted-delivery information for a $5.55 fee; it travels like ordinary mail and has no insurance of its own. Registered Mail is the most secure USPS service: the piece moves under a system of receipts from acceptance to delivery, includes insurance up to $50,000 for the declared value, and costs $20.90 to $180.00 plus postage (fees effective July 12, 2026). Use Certified Mail for documents that need a delivery record and Registered Mail for valuable or irreplaceable items.
What is Registered Mail?
Registered Mail is a USPS extra service for items where loss would be serious: cash, negotiable instruments, jewelry, or a document that cannot be replaced. The Domestic Mail Manual calls it the most secure service USPS offers. USPS describes the piece as protected by safes, cages, sealed containers, locks, and keys, and it is tracked internally through a system of receipts from the moment a postal employee accepts it until it is delivered.
You must declare the full value of what you are sending, and insurance for that value is included in the fee up to $50,000. A piece with no declared value can still be registered, but without insurance. Registered Mail can be added to First-Class Mail, Priority Mail, or USPS Ground Advantage, and it always requires a signature at delivery.
Certified Mail is simpler. It gives you a numbered mailing receipt, and USPS records the delivery, including the signature of the person who accepts it. In transit it is handled as ordinary mail, with no special security and no insurance unless the underlying mail class includes some, as Priority Mail does.
Registered Mail vs. Certified Mail at a glance
The table compares the two services as USPS describes them. Fees are USPS retail prices effective July 12, 2026, and do not include postage.
| Feature | Certified Mail | Registered Mail |
|---|---|---|
| Best for | Letters and documents where you need a record of sending and delivery | Valuable or irreplaceable items that need security and insurance |
| Handling in transit | Handled as ordinary mail | Kept secured and processed manually under a chain of receipts |
| Insurance | None of its own; Priority Mail’s included insurance still applies | Included for the declared value, up to $50,000 |
| Tracking | Delivery or attempted-delivery information online | No scans en route; delivery or attempted-delivery information only |
| Signature at delivery | Required | Required |
| Fee | $5.55 | $20.90 (no declared value) to $180.00 (over $50,000) |
| Restricted Delivery | Certified Mail Restricted Delivery, $14.35 in place of the $5.55 fee | Registered Mail Restricted Delivery, $8.80 on top of the Registered fee |
| Return Receipt | Available: $2.91 electronic or $4.65 hardcopy | Available: $2.91 electronic or $4.65 hardcopy |
| Speed | Same as the mail class it is added to | Based on the mail class, but USPS says the secure handling can slow it down |
| Mail classes | First-Class Mail, Priority Mail | First-Class Mail, Priority Mail, USPS Ground Advantage |
| How to mail it | At a Post Office; also through online services that mail Certified letters | Must be handed to a postal retail employee or a rural carrier |
How much does Registered Mail cost?
The Registered Mail fee depends on the value you declare, and you pay postage on top of it. Between $5,000.01 and $50,000, the fee is $40.50 plus $3.10 for each $1,000, or part of $1,000, above $5,000. Above $50,000 you pay a flat $180.00, but insurance compensation still stops at $50,000.
Worked examples for a stamped First-Class letter up to 1 ounce ($0.82 postage): a registered letter with no declared value costs $0.82 + $20.90 = $21.72. Declare $400 and it costs $0.82 + $25.00 = $25.82. Declare $10,000 and the fee is $40.50 + (5 × $3.10) = $56.00, or $56.82 with postage. USPS can change these fees, so check Notice 123 before you mail.
| Declared value | Registered Mail fee |
|---|---|
| $0.00 (no insurance) | $20.90 |
| $0.01 to $100 | $21.50 |
| $100.01 to $500 | $25.00 |
| $500.01 to $1,000 | $28.10 |
| $1,000.01 to $2,000 | $31.20 |
| $2,000.01 to $3,000 | $34.30 |
| $3,000.01 to $4,000 | $37.40 |
| $4,000.01 to $5,000 | $40.50 |
| $5,000.01 to $50,000 | $40.50 plus $3.10 per $1,000 or fraction over $5,000 |
| Over $50,000 | $180.00 (insurance limited to $50,000) |
Rules to know before you register something
Registered Mail has preparation rules that Certified Mail does not, and a clerk can refuse a piece that does not meet them:
- Declare the full value. For merchandise, that means market value or cost; for cash, the full amount. Letters and records with no intrinsic value can be sent with no declared value.
- Use a suitable envelope. USPS will not register padded envelopes, Tyvek or other spun-bonded mailers, plastic envelopes, or glossy-coated paper envelopes. The address side must be at least 5 inches long and 3-1/2 inches high.
- Seal it yourself. Postal employees may not help prepare or seal Registered Mail, and a piece that looks opened and resealed may be refused.
- Commercial cash over $500 must go by Registered Mail.
- Do not expect a refund of the fee. Once USPS accepts the item, the Registered fee is not refundable; if the item is lost and you file a claim, USPS refunds the postage but not the fee.
What does Restricted Delivery mean?
Restricted Delivery tells USPS to deliver the piece only to the addressee or to someone the addressee has authorized in writing as their agent. The addressee must be a named individual, not a company or a job title. USPS may ask the person collecting it for ID.
USPS no longer sells Restricted Delivery as a stand-alone service. You buy it as part of a combination: Certified Mail Restricted Delivery is a single $14.35 fee, while Registered Mail Restricted Delivery adds $8.80 to the Registered Mail fee. Choose it only when a particular person must be the one who signs; for a letter to a business, it usually adds cost without adding much.
What does it mean when Certified Mail is unclaimed?
Both services need a signature, so a piece that cannot be handed to someone is not left in the mailbox. The carrier leaves a notice instead, and the recipient can pick the item up at the Post Office or request redelivery. If nobody does either, USPS returns it to the sender after 15 days. For Certified Mail, USPS says it is returned on the 16th day.
“Unclaimed” is the USPS return reason for mail the addressee failed to call for. It means the piece reached the delivery Post Office and a notice was left, but no one collected it. It is different from “Refused,” which means the addressee declined to accept the piece. Keep the returned envelope unopened along with your receipt and tracking history. Whether an unclaimed or refused notice still counts for a legal or contractual purpose depends on the rule that governs it, so check that rule or ask a qualified professional.
Which one should you choose?
Start from what you are sending and what could go wrong:
- Choose Certified Mail for paperwork: notices, dispute letters, applications, and other documents where the risk is someone saying they never received it. It is cheaper and travels at normal speed.
- Choose Registered Mail for value: cash, negotiable instruments, jewelry, or originals that would be costly to replace, where you want the item secured in transit and insured.
- Choose neither if you only need to show that you mailed something on a certain date. A Certificate of Mailing is $2.45 at a Post Office.
- If a law, agency, court, or contract names a specific service, use exactly that service. These descriptions are general and are not legal advice.
Sending without a trip to the Post Office
Registered Mail cannot be sent online in any meaningful sense: however you pay for it, USPS requires the item to be handed to a postal retail employee or a rural carrier. Plan a counter visit for anything you register.
Certified Mail is different. IRIS prints your PDF letter and mails it with Certified Mail for $6.95 on top of the letter price, which starts at $3.20 for one black-and-white page with First-Class postage. IRIS does not offer Registered Mail, insurance, or Restricted Delivery, and Certified letters are limited to six sheets. Your order page shows the tracking number and provider-reported events when available, not a postmarked USPS receipt.
Sources & further reading
Product details checked against the IRIS API contract when this article was published. Platform references can change; consult the linked documentation when implementing.
- USPS Notice 123 price list, effective July 12, 2026 (PDF)
- USPS Domestic Mail Manual 503, Extra Services
- USPS FAQ, Registered Mail: the basics
- USPS FAQ, Certified Mail: the basics
- USPS FAQ, How can I restrict mail delivery?
- USPS, Insurance and extra services
- USPS Domestic Mail Manual 508, Recipient Services
- USPS Domestic Mail Manual 507, Mailer Services (return endorsements)
Published by IRIS Postal Forms, operated by Great Lakes Computing Office LLC. Send a correction.