For Canadian importers, the monthly customs payment should not be a blind accounts-payable step. It is a chance to confirm that the shipments, declarations, credits and payments recorded under your importer account match what actually happened.
This month has a clear timeline. The Canada Border Services Agency says the Statement of Account is available through the CARM Client Portal or EDI on the 25th of each month. The October 2026 payment due date is October 30. Electronic payments through the portal are accepted until 11:59 p.m. Eastern on the due date, while mailed or couriered cheques must arrive by 4 p.m. Eastern. Check your financial institution’s cut-off time if you pay through online banking or EDI.
That leaves a short review window. Use it well.
1. Confirm you are reviewing the right importer account
Start with the legal business name and the importer program account shown on the statement. If your company has more than one division, business number or import account, confirm the transactions were posted to the right place.
Then compare the Statement of Account with your internal shipment register and broker report. Look for missing transactions, duplicates, unfamiliar entries and goods that cleared under a different account than expected. The CBSA says importers can use the CARM portal’s real-time transaction history to review credits and debits.
Do not assume a transaction is correct simply because the cargo was released.
2. Match the shipment details to the customs declaration
Pick a practical sample, then review every material shipment or exception. Match the commercial invoice, purchase order and transport record to the Commercial Accounting Declaration.
Check the supplier, product description, quantities, currency, invoice value and tariff classification. A vague description such as “parts” may be easy to accept during a busy week, but it is weak support for a classification decision. Your file should explain what the goods are, what they are made of and what they do.
If the goods, pricing or shipment structure changed, compare the current declaration with the last correct entry. A dedicated Canadian customs broker should be able to explain any difference in plain language.
3. Separate shipping country, customs origin and preferential origin
These are related facts, but they are not interchangeable.
The shipping country tells you where the goods began this leg of their journey. Customs origin is determined under the applicable origin rules. Preferential origin means the goods qualify for a reduced tariff treatment under a trade agreement and the claim is supported by the required proof.
A product shipped from a U.S. warehouse is not automatically U.S. origin and does not automatically qualify under CUSMA. The CBSA’s origin guidance says tariff treatment depends on the rules of origin, proof requirements, shipping requirements and other conditions. Importers generally need valid proof of origin when accounting for a preferential claim, subject to applicable exceptions, and must retain supporting records.
Compare the origin and tariff-treatment fields on the declaration with your supplier’s documents. If the supplier, manufacturing location or bill of materials changed, do not carry the old claim forward without checking it.
4. Recheck value for duty when the invoice does not tell the whole story
The invoice total is an important starting point, but it is not always the complete customs value. Ask whether the transaction included separate assists, royalties, licence fees, commissions, packing charges, proceeds or later price adjustments that your customs team needs to assess.
Also check the currency and exchange rate used. A typing error or incorrect currency can create a large variance even when the classification and duty rate are right.
The goal is not to recalculate every entry from scratch. It is to identify the transactions where the commercial facts changed or the declared value does not match the supporting file.
5. Understand the payable balance, credits and offsets
The number to pay is not always the sum of the month’s new declarations. Prior payments, refunds, adjustments and credits may affect the account.
CBSA tells importers to pay the amount shown as the “Payable balance as of statement date” in the Statement Summary. Its commercial accounting guidance also explains that credits and debits can be reviewed in transaction history.
If a credit does not appear where expected, investigate before reducing the payment yourself. Record what the credit relates to, whether it has cleared and who is following up. Do not deduct an amount from the statement yourself to correct it; confirm the corrected amount payable with your broker or CBSA.
6. Correct an error through the right process
If you find an error before the payment due date, it is generally handled as a correction to the Commercial Accounting Declaration. After the payment due date, a formal adjustment is required. Type C declarations cannot be corrected through the pre-payment process because payment is required immediately.
The distinction matters. CBSA’s current post-accounting guidance says importers are legally required to correct declarations of origin, tariff classification or value for duty within 90 days after they have reason to believe the declaration is wrong. Your authorized customs broker can help submit the correction or adjustment, but your company should document when the issue was found and the evidence supporting the change.
Do not wait for the next monthly statement if the error is already known.
7. Save the records and assign the next action
Keep the statement, transaction detail, customs declarations, invoices, origin documents, payment confirmation and correspondence together. Canadian importers must generally keep import records for six years. The Imported Goods Records Regulations specify records covering origin, purchase, importation, costs, value and payment, among other details.
Finish the review with a short exception list. Give each item an owner and a next action: broker clarification, supplier document, internal approval, correction, adjustment or payment.
Make the monthly review easier
A good customs process catches most issues before the Statement of Account arrives. The monthly reconciliation is the backstop, not the first control.
If your team is chasing declarations across inboxes or cannot explain changes in duty from one shipment to the next, start with a sample of recent entries. Welke can review the customs and freight information together, identify what is missing and give you a named contact for follow-up.
See what to prepare for a customs or freight review, or request a free brokerage review.