Shipping Invoice Audit in Canada: Why Most US Tools Leave Money on the Table

If You Ship in Canada, the Famous Audit Tools Have a Blind Spot

Search for a parcel audit service and you will quickly run into the big American names. They are good at what they do. The problem is what they do not do.

The two most recognized parcel audit tools in the market audit FedEx and UPS, and that is it. They do not touch Canada Post. They do not touch Purolator. For a US seller shipping everything through FedEx and UPS, that is fine. For a Canadian seller, it means a tool that can only see part of your shipping spend is quietly ignoring the rest.

Look at a typical Canadian online store. A real chunk of volume moves on Canada Post because it reaches every address in the country and the rates work for lighter parcels. Another chunk moves on Purolator for time-sensitive domestic express. Whatever is left goes to UPS or FedEx. A FedEx-and-UPS-only audit checks that last slice and waves the rest through. The overcharges hiding in your Canada Post and Purolator invoices never get found because nobody is looking.

What a Shipping Audit Is Supposed to Catch

A proper invoice audit is not one check, it is several, run against every line on every invoice. The four that recover the most money:

Late delivery refunds. Most guaranteed services carry an on-time commitment. When the carrier misses it, you are owed a refund, but you have to identify the late shipment and claim it inside a deadline. UPS gives you a tight window. Purolator now refunds half the service rate and wants the claim within 15 days of the invoice. Canada Post covers Priority and Xpresspost. Each carrier has its own rules, and a tool that only knows the US carriers cannot apply the Canadian ones.

Duplicate charges. The same shipment billed twice, or the same surcharge applied more than once on a single shipment. These are pure billing errors and they are more common than most shippers assume.

Voided labels still billed. You created a label, never used it, voided it, and the charge showed up on your invoice anyway. Without a line-by-line audit these are nearly invisible.

Invalid surcharges. Residential surcharges applied to commercial addresses, address correction fees charged when your address was fine, fuel and area surcharges that do not match the published schedule. Carrier address databases are frequently out of date, and you pay for their mistakes unless someone disputes them.

A Canadian audit has to run all four of these across all four carriers. Running them on only two carriers leaves the other half of your invoices unchecked.

How Performance-Based Pricing Works

Most reputable audit services, on both sides of the border, work on contingency. There is no monthly fee and no upfront cost. They take a percentage of what they actually recover for you. If they find nothing, you pay nothing.

The percentage varies across the market, and that is the number worth asking about directly. A transparent service tells you the rate before you sign up, applies it only to money actually recovered, and never charges you for a claim that does not come back. When you compare tools, look past the marketing and ask two plain questions: what carriers do you audit, and what is your cut of what you recover. If a tool dodges either one, keep looking.

The Honest Comparison

It would be easy to claim ShipSherlock is the only tool that audits Canadian carriers. That is not true, and you would find out quickly. A couple of larger international platforms do cover Canada Post and Purolator as part of broader post-purchase suites, and there is at least one other Canadian-focused service in the market.

Here is the real difference. The biggest, best-marketed tools, the ones you find first, are FedEx and UPS only, so for a Canadian shipper they are the wrong fit no matter how polished they look. Among the tools that do cover Canada, ShipSherlock is built specifically for Canadian sellers, audits all four major carriers in one place, keeps current with Canadian rule changes like the March 2026 Purolator cut, and lets you see your own numbers before you commit anything, through a free audit with no card required.

See Your Own Invoice First

The fastest way to know whether an audit is worth it is to run one on your own data. Not a sales call, not an estimate, your actual invoices.

Try the free shipping audit and see what is hiding in your Canada Post, Purolator, UPS, and FedEx charges. If there is nothing to recover, you will know in a couple of minutes. If there is, you will see exactly how much, before you decide anything.