A package that is returned to you is not just a minor incident: it’s a shipment you’ve paid for twice, a sale that’s often lost, and a dissatisfied customer. The return to sender (RTS, for return to sender) remains one of the most underestimated cost items for Canadian small and medium-sized businesses, because it never appears as a separate line item on the carrier’s invoice.

In practice, an RTS combines several charges: the outbound shipping cost (which has already been billed), the return shipping cost, and often one or two additional surcharges (delivery attempts, storage, address correction). For a 5-kg package shipped from Montreal to Calgary, the total cost can easily exceed twice the original price.

This guide explains why packages are returned, what each major carrier charges in Canada in 2026, and, most importantly, what concrete steps you can take to reduce your return rate.

Why a package Is Returned to the Sender

Canadian carriers return shipments for a limited number of reasons, and the vast majority of these can be prevented beforehand.

The Most Common Causes

• Incomplete or incorrect address — missing apartment number, invalid ZIP code, nonexistent street. This is by far the leading cause of RTS in Canada.
• Recipient not found after the specified number of attempts — Most commercial services allow for one to three attempts before automatically returning the item.
• Unclaimed package at the service location — After a delivery notice is left, the holding period is generally 5 to 15 calendar days, depending on the carrier and the type of pickup location.
• Recipient's refusal — a common occurrence in cross-border trade when unexpected duties and taxes are charged at the door.
• Refusal to Pay Customs Duties — For a DDU/DAP shipment, if the recipient refuses to pay the customs clearance invoice, the shipment is returned.
• Prohibited or Misdeclared Goods — aerosols, improperly labeled lithium batteries, non-compliant liquids.
• Address not served — a post office box delivered by a private courier, or a location outside the network.

The Special Case of P.O. Boxes

A common and costly mistake: UPS, FedEx, Purolator, and DHL do not deliver to post office boxes (PO Box). Only Canada Post delivers to these addresses. A package addressed to a PO Box and entrusted to a private courier almost always results in a return to sender (RTS), sometimes after several days of back-and-forth that is billed to the sender.

The Actual Cost of Returning a Package to the Sender

No Canadian carrier reimburses the cost of the outbound shipment when a package is returned. The rule is consistent: the return is treated as a new shipment, charged based on the higher of the actual weight or the volumetric weight, with the same surcharges applying.

These figures are for reference only and may vary depending on your service agreement, the service you choose, and your destination. Always verify the exact terms of your contract with your carrier.

The Cumulative Cost, in Figures

Let's consider a 5-kg package, measuring 40 × 30 × 25 cm, shipped from a business address in Montreal to a residential address in Calgary, and then returned because there was no apartment number.

In other words, a shipment budgeted at about $30 ends up costing three to four times as much. For 1,000 packages per year with an RTS rate of 2 %, this amounts to approximately 20 returns and an annual loss of 1,900 $ to 2,600 $—not to mention tied-up inventory and refunds issued.

The Cross-Border Case: The Most Expensive Return

An RTS from the United States or Europe is significantly heavier than a domestic return shipment, for three reasons.

• The return trip is international, and therefore priced at a much higher level.
• The fees and taxes paid on the outbound trip are not automatically refunded. In Canada, it is possible to file a refund claim with the CBSA for returned goods, but this requires supporting documentation (proof of export, the appropriate form, and a transaction number).
• Brokerage fees may apply twice, upon initial entry and upon return.

For DDU/DAP shipments to the United States, it is common for the recipient to refuse to pay duties. Shipping via DDP, where you prepay duties and taxes, eliminates this reason for rejection at the source and is often less expensive than the RTS, which it avoids.

Seven Tips to Reduce Your Return Rate

1. Verify the addresses before printing the label

This is the most effective solution. Automated validation at the time of order detects invalid ZIP codes, nonexistent street numbers, and missing units. This alone eliminates a large portion of RTSs.

2. Require the unit number for residential addresses

Make the «apartment/unit» field required whenever an address includes more than one type of dwelling. A field left blank is a direct cause of address correction fees and subsequent returns.

3. Check the «CP» format before selecting a carrier

Establish a simple rule in your system: if the address contains «CP,» «C.P.,» «PO Box,» or «Case postale,» the item is sent via Canada Post. This single rule eliminates an entire category of returns.

4. Provide the carrier with a valid phone number and email address

Carriers contact the recipient before returning a package. A cell phone number and email address provided with the shipment often make it possible to successfully deliver the package on the second attempt.

5. Redirect to a pickup location as soon as a delivery fails

Instead of letting the number of delivery attempts run out, proactively redirect the package to a pickup location or a locker. The cost of redirection is almost always lower than the cost of a full return.

6. Prepay international duties and taxes

DDP costs more per label, but it eliminates the most common reason for rejection in cross-border shipments and improves the first-attempt delivery rate.

7. Review your invoices for incorrectly billed RTS

Errors do occur: shipments marked as returned even though the address provided was correct, double billing for return shipping, or an address correction surcharge applied to a valid address. A monthly review of your invoices allows you to request these credits, generally within the contractual 6-month period.

What to Do If the Package Has Already Been Returned

The package has been returned to you. Three simple steps can help minimize the damage.

• Document the exact reason. The carrier's return code indicates whether the issue is an incorrect address, a refusal, or an unclaimed package. This information allows you to address the root cause rather than just dealing with the symptom.
• Dispute this if the address was valid. If you can prove that the address provided was complete and valid, the return and address correction fees are subject to dispute.
• Do not resend the package using the same label or address. Correct the address, confirm it with the customer, and then create a new shipment. Resending the shipment as-is will result in the same failure and will again double the invoice amount.

Follow the Right Indicator

The return-to-sender rate deserves monthly monitoring, just like your average cost per package. A rate below 1 % is generally considered healthy for a Canadian shipper. Above 3 %, the problem is structural: it almost always lies in the collection of addresses at the time of order, not in the carrier’s service.

Next, segment by cause. If 70 % of your returns are due to incomplete addresses, address validation will solve most of the problem. If the majority are due to unclaimed packages, the key is to follow up with the recipient.

In a nutshell

Return-to-sender shipments always cost twice as much, and additional charges often drive the total up to three or four times the original rate. The good news is that the causes are limited and largely preventable. Address validation, required unit fields, the «ZIP Code → Canada Post» rule, providing the recipient’s contact information to the carrier, and prepaying international fees cover the vast majority of cases.

At Shipping Store, we help Canadian small and medium-sized businesses reduce their return rates and recover charges incorrectly billed to their carrier accounts. For an analysis of your shipments and surcharges, Contact our team and compare your current rates with what you might pay.

The amounts listed in this article are for reference only and vary depending on the carrier, service, destination, weight, and your commercial agreement. Always confirm the applicable charges with your carrier.