CBSA D-Memoranda and customs notices do not all operate on the same timetable. During the period reviewed, some measures applied on a stated effective date, some notices described an existing process, and some revisions consolidated or clarified guidance without creating a new duty. For importers, the immediate control is to record what changed, which date governs, and whether the change affects classification, origin, accounting, permits or only internal reference material.
Why the date on a CBSA document can mislead
A notice’s publication date, revision date and effective date can be different. Customs Notice 26-21, for example, was issued on August 25, 2026, but amended the description of tariff item 8507.60.20 effective August 6, 2026. Importers of affected battery goods should therefore review entries and classification decisions against the date specified in the measure, rather than relying only on the date the notice appeared online. CBSA Customs Notice 26-21
The same distinction appears in Customs Notice 26-22. The United Kingdom tariff treatment under the Comprehensive and Progressive United Kingdom Tariff became available on September 1, 2026, while the notice was updated when the T2026-2 tariff files became available on September 16. The first date determines availability of the treatment; the later date describes an update to the published tariff material. CBSA Customs Notice 26-22
A four-date control for each revision or notice
For each CBSA document that reaches the customs, purchasing or logistics team, an importer may find it useful to record four separate fields:
- Document date: when CBSA issued or revised the document.
- Effective date: when a new tariff, reporting requirement or operational rule applies.
- First affected transaction: the first shipment, declaration, warehouse withdrawal or adjustment that the importer believes falls within the measure.
- Review date: when the importer will confirm that procedures, broker instructions and supporting records remain aligned.
This prevents a notice from being treated as either retroactive or irrelevant simply because its web publication date differs from the date stated in the measure. The broker and importer should also confirm which transaction type is affected before changing an automated instruction or product master.
Measures with a stated implementation date
| Measure | Date to control | Primary file review |
|---|---|---|
| U.S.-origin surtax under Customs Notice 26-23 | September 8, 2026 | Origin, tariff item, value for duty and CARM accounting |
| United Kingdom tariff treatment under Customs Notice 26-22 | September 1, 2026 | Origin evidence, classification and tariff treatment code 35 |
| Aluminum information under D19-10-2 | October 1, 2026 | Smelt and casting data, IID elements and applicable CAD field |
| Cargo process for CLVS third-party air carriers under Customs Notice 26-24 | September 14, 2026 | Courier and carrier routing arrangements |
The dates and control subjects in this table come from the respective CBSA notices and memorandum. Customs Notice 26-23 Customs Notice 26-22 Memorandum D19-10-2 Customs Notice 26-24
What the dated measures require teams to check
U.S.-origin goods: do not stop at the commercial invoice
Customs Notice 26-23 implemented a surtax on specified U.S.-origin goods effective September 8, 2026. The applicable rate depends on the tariff item, and the surtax is based on value for duty. The measure can apply to commercial shipments entering under de minimis thresholds. The notice was revised on October 23, 2026, and certain goods already in transit when the measure came into force may be excluded where the importer has evidence of transit. Customs Notice 26-23 Canada Gazette order
Importers should discuss with their broker how origin evidence, tariff classification, value for duty and any in-transit evidence are retained together. For a business with purchasing in Toronto, a distribution warehouse in Brampton and customs records managed in Mississauga, the control should identify one owner for the commercial invoice and one owner for the supporting origin file.
Aluminum: add product-data ownership before the declaration
Revised Memorandum D19-10-2 incorporated additional information requirements for aluminum products covered by General Import Permit 83, effective October 1, 2026. The information includes the country of largest smelt, the country of second-largest smelt where applicable, and the country of most recent cast. The information is transmitted through applicable IID data elements, and the memorandum identifies “GIP83-OIC19-1224” for the applicable CAD field. CSA importers and certain low-value shipments are exempt from the new data requirement under the memorandum. Memorandum D19-10-2
The practical question is not only whether a supplier can provide the data. It is whether the data arrives early enough for the broker to use it on the relevant declaration, and whether the importer can distinguish a shipment that falls within an exemption. Importers should review supplier questionnaires, purchase-order data and broker transmission instructions rather than adding an unverified country field to a product database.
United Kingdom goods: separate eligibility from the file update
Customs Notice 26-22 states that eligible goods from the United Kingdom, the Channel Islands and the Isle of Man may receive Comprehensive and Progressive United Kingdom Tariff treatment from September 1, 2026. The treatment is identified by code 35, and the T2026-2 tariff contains the applicable rates and country-treatment changes. Importers should review the tariff classification and origin support for eligible goods rather than assuming that every shipment from the United Kingdom qualifies. Customs Notice 26-22
Updates that should not be treated as new duties
Not every revision calls for a rate change or a new release instruction. Revised Memorandum D10-15-15, dated August 14, 2026, combined earlier guidance on tariff items 9958.00.00 and 9959.00.00 concerning qualifying vehicle parts and manufacturing materials. The revision is described as a consolidation and clarification. Importers claiming duty-free treatment should review the consolidated guidance, but the document should not automatically be logged as a new duty measure. Memorandum D10-15-15
Similarly, revised Memorandum D11-6-8, dated September 9, 2026, incorporated CARM Release 3 terminology into verification procedures covering non-free-trade-agreement origin, tariff classification and value for duty. The memorandum refers to the Commercial Accounting Declaration in place of the former B3-3 and B2 forms. Importers subject to a verification should align their records and responses with current CAD and CARM terminology, but the revision itself is not a new tariff charge. Memorandum D11-6-8
Customs Notice 26-20 also clarified the treatment of tariff-rate-quota goods entering customs bonded warehouses. It explains that a shipment-specific Global Affairs Canada import permit must cover the date goods leave the warehouse to obtain the within-access rate. Where goods initially entered under a General Import Permit, the Type 10 CAD is to be amended when the shipment-specific permit is obtained; the ex-warehouse Type 20 or 21 transaction cannot claim within-access treatment until the Type 10 record is corrected. Customs Notice 26-20
Questions to route to the customs broker
- Which date controls the first affected entry: the document date, stated effective date or another transaction date in the measure?
- Does the change affect every shipment, or only goods within a tariff item, origin rule, permit program or reporting exemption?
- What evidence should be retained with the entry file—for example, origin records, transit evidence, smelt and casting information or permit documentation?
- Does the change require a new CARM or CAD field, a correction to an existing declaration, or only an update to internal reference material?
- Which open entries, warehouse withdrawals, adjustments or advance rulings should be reviewed?
Finally, Customs Notice 26-24 should be kept in its proper lane. Effective September 14, 2026, authorized participants in the Courier Low Value Shipment Program may use third-party air carriers that are not PIP-certified, provided the stated bonded-warehouse and presentation conditions are met and the CLVS participant retains active PIP certification for air mode. The change concerns courier operating arrangements; it does not broadly remove PIP requirements or change an importer’s underlying customs accounting and release obligations. Customs Notice 26-24
A disciplined date register helps an importer avoid two opposite errors: applying a new control too late, or treating a clarification as a new duty. The most useful handoff is a short record showing the affected goods, controlling date, required evidence, transaction type and broker decision.