A Canadian importer treats customs as something the broker handles. The broker files, the goods clear, the duty is paid, and nobody revisits it. That division of labour was always a simplification of the legal position, and since October 2024 it has become a genuinely expensive one, in both directions.
Key Takeaway
Customs duties are based on tariff classification, country of origin, and the value of the goods, and errors in any of the three can be corrected within four years of the import date in either direction. CARM, fully implemented in October 2024, centralises classification, valuation and duty payment data in one account and gives CBSA auditors direct access to transaction history, with CBSA publishing that rule-based automation is used to assess duties and taxes and identify issues. CBSA's compliance priority list dated January 2026 adds precious metals, CUSMA automotive rules of origin, steel and aluminum surtaxes, energy commodities and nine categories of tariff classification. A CUSMA claim requires a valid Certification of Origin from the supplier, without which CBSA applies the MFN rate even to qualifying goods. Canada's drawback programme recovers 100% of duty on goods subsequently exported, against 99% in the United States, also within four years.
The Detection Asymmetry
The point that organises this article, and it is our own framing of what the sources describe.
Customs errors are symmetric in law. An importer who classified goods incorrectly may have underpaid or overpaid, and the correction window is the same in both cases: the four-year amendment window applies to incorrect HS codes or customs value, and a missed free trade agreement claim can be amended within four years of the import date, with CBSA assessing the difference and issuing a refund[1].
Detection is not symmetric at all. On the underpayment side, CBSA publishes that rule-based automation, or algorithms, in the CARM system are used to assess duties and taxes and to identify issues[2], and CARM gives CBSA auditors direct access to an importer's transaction history, making discrepancies easier to identify[3].
On the overpayment side there is no equivalent. No system scans your declarations to notice that you have been paying the most-favoured-nation rate on goods that qualified for preferential treatment, or classifying a product under a higher-duty heading than it belongs in. That review happens only if the importer commissions it.
One commentary reports the consequence: many importers who have never reviewed their free trade agreement eligibility or HS classifications find recoverable amounts across the available routes that exceed the cost of the review itself[1].
So the practical position is that one side of a symmetric legal regime is automated and the other is manual, and the manual side is the one that pays the importer. That is the argument for a periodic classification and origin review, and it is an argument about detection rather than about compliance risk.
Three Determinants, Not One
The structure of a duty calculation, stated by CBSA.
Goods imported into Canada are generally subject to the 5% Goods and Services Tax and potentially subject to customs duties, and customs duties are based on the tariff classification, the country of origin, and the value of the goods[4].
Each is a separate determination with its own rules, its own evidence and its own failure mode, and importers commonly attend to one.
Classification assigns the goods a heading in the Customs Tariff, which sets the applicable rate. It is a technical exercise turning on what the product is, what it is made of and what it does, and headings can differ on distinctions that seem arbitrary from a commercial perspective.
Origin determines which tariff treatment applies, which is where free trade agreement preferences live. It is not the same question as where the goods shipped from.
Value determines the base to which the rate applies, and the valuation method used must be supportable.
The legal framework sits across three statutes: the Customs Act, the foundational statute governing importation including assessment, payment and appeal rights; the Customs Tariff, which establishes tariff classification and duty rates; and the Excise Tax Act, which governs GST/HST collected at importation[3].
Note that CBSA also administers import requirements on behalf of other departments, so some goods may need permits, certificates or inspections in addition to meeting CBSA's own requirements before release[4]. That is a separate compliance track from duty and is easy to discover late.
What CARM Actually Changed
The system, and the shift in responsibility it embodies.
CARM, the CBSA Assessment Revenue Management system, was fully implemented in October 2024[5]. One guide frames the trade-off plainly: for importers the upside is a more transparent, self-serve system, and the downside is that responsibility for getting registration and classification right now sits more squarely with the importer, not just the broker[6].
Another describes the same shift from the broker's side: errors in classification, valuation or reporting now have immediate financial and audit consequences, and customs brokers are evolving from transaction processors into compliance advisors, supporting importers with classification accuracy, audit readiness and system alignment[7].
It is worth being precise about what did and did not change legally. CARM is not a standalone law; it is a system that operationalises existing Canadian customs legislation[3]. The importer's legal responsibility for accurate declarations predates CARM. What changed is the visibility of that responsibility, the immediacy of its consequences, and the practical difficulty of treating it as somebody else's function.
Two operational failure modes appear repeatedly. Incorrect CARM portal entries trigger CBSA assessments at rates higher than the importer intended to declare, producing duty bills larger than the correct liability. And entries without correct security coverage do not clear until the security gap is resolved, adding days or weeks to shipment timelines[1].
The same source draws the conclusion we would endorse: getting CARM right does not reduce your duty rate, it stops unnecessary costs that look like duty increases but are actually compliance failures[1].
The Visibility Point
The consequence of centralisation, which importers underestimate because it is invisible from their side.
Because the account centralises classification, valuation and duty payment data in one place, patterns that used to be harder to spot, like consistently undervaluing shipments or misclassifying a product under a lower-duty HS code, are now far more visible to CBSA's systems[6].
The operative word is patterns. A single declaration reveals little. A multi-year record of the same importer declaring the same product reveals consistency or inconsistency, and inconsistency is what an automated review is well suited to surface.
That has an implication most importers have not drawn, and we offer it as our own analysis. Inconsistency is itself a risk factor independent of whether any individual classification was correct. An importer whose product has been declared under three different headings over four years has created a record in which at most one treatment can be right, and the record is now in one place and machine-readable.
This commonly arises without anyone deciding anything: a change of broker, a new product code, a supplier's revised invoice description, or a staff turnover at the freight forwarder. Nobody intended a reclassification. The record shows one.
If a compliance verification is opened, the importer will typically be asked to provide supporting documentation for recent import declarations, including commercial invoices, bills of lading, and proof of valuation method[6].
Security Became A Working Capital Item
A change that moved customs out of logistics and into treasury.
Financial security is one of the most significant changes, as importers must now manage their own bonding requirements to maintain Release Prior to Payment privileges, which impacts liquidity planning and credit exposure with CBSA, especially for high-volume importers[7].
Release Prior to Payment is what allows goods to clear the border before duties and taxes are remitted. Without it, or without adequate security supporting it, releases are delayed[1].
Two consequences for a finance function. Security is a credit facility in substance, so it consumes capacity that might otherwise support working capital, and it needs to be sized against import volume rather than set once and forgotten. An importer whose volumes have grown since registration may be operating with security calibrated to a smaller business.
And because inadequate security stops goods rather than merely generating a charge, the failure mode is operational rather than financial. A shipment held at the border because a security posting lapsed is a supply chain event that no amount of after-the-fact payment resolves quickly.
The practical instruction is that whoever owns the CARM account, security level and payment obligations should sit inside the finance function with a review cadence, rather than with whoever happens to manage freight.
The Importer Of Record Is Liable
The legal point that the broker relationship obscures.
One guide notes the importance of understanding what an importer of record actually is, including what happens if HS codes or valuations are filed incorrectly[6].
The position is that the importer of record bears the legal responsibility for the accuracy of a declaration. A broker acts as agent, files on instructions and on the information supplied, and its engagement terms will generally allocate responsibility for accuracy back to the importer.
That produces a specific and common gap. The broker classifies the goods because the importer does not know how, using a product description the importer supplied. Neither party regards itself as having made a substantive determination: the importer thinks the broker is the expert, the broker thinks it is applying the importer's description. Nobody has actually verified that the classification is right.
Importers that have made errors face assessments for additional duties and taxes owed as well as penalties, and in some cases may be entitled to refunds if errors lead to overpaid duties and taxes[5].
The instruction is not to distrust the broker, whose expertise is real and whose role is expanding into compliance advice[7]. It is to establish explicitly, in writing, who made each classification determination and on what basis, because that is the record an importer will need if the determination is questioned, and because the liability sits with the importer regardless of the answer.
The January 2026 Audit List
CBSA publishes where it is looking, which is unusually useful and unusually underused.
KPMG reports that CBSA released an updated list of compliance areas targeted for audit investigations, which now includes precious metals, the rules of origin for the automotive industry under CUSMA, the surtaxes imposed on steel and aluminum goods, energy commodities, and nine specific categories of tariff classification. Importers, including manufacturers and retailers, of goods subject to any of the listed compliance priorities should ensure they meet all related trade obligations. The list is dated January 2026 and adds origin verifications for the automotive industry under CUSMA among other new priorities[5].
The list also identifies origin generally: goods for which importers may have incorrectly determined the proper origin, often related to tariff treatment under a trade agreement[5].
The specificity of the classification priorities is worth noting, because it illustrates how granular this area is. Reported examples include verifications related to the classification of frozen desserts containing 5% of dairy products, and cheese treats for dogs[5].
Those examples are not trivial. They demonstrate that classification disputes turn on composition thresholds and product characterisations that a commercial description will not resolve, and that CBSA targets categories where it believes systematic error exists.
The practical use of a published priority list is straightforward and rarely taken: check whether your goods appear on it, and if they do, review before you are reviewed. KPMG's own note observes that many importers have additional considerations as a result of recent global tariff measures and upcoming changes[5], which describes the current environment for most Canadian importers.
Origin Is The Hardest Of The Three
Why the origin determination generates more error than classification or valuation, offered as our own analysis.
Classification asks what the product is, and the answer is discoverable by examining it. Valuation asks what was paid, and the answer sits in the commercial documents. Origin asks where the goods originate for tariff purposes, and that is not a question about the product in front of you.
Origin under a free trade agreement depends on rules that vary by product and by agreement, and typically turn on where inputs came from, how much processing occurred where, and whether that processing meets a specified threshold. Answering it requires information the importer does not hold, about a supply chain upstream of its supplier.
That is why CBSA's priorities single out origin generally and CUSMA automotive rules of origin specifically[5]. Automotive supply chains involve components crossing borders repeatedly, and the rules governing whether a finished vehicle or part qualifies are correspondingly complex.
Two practical consequences. Shipping origin is not tariff origin, and goods shipped from a CUSMA partner do not necessarily qualify for CUSMA treatment. And because the determination depends on the supplier's inputs, the importer is reliant on the supplier's assertions, which is exactly the position the certification requirement is designed to formalise.
The Certification Nobody Chases
The documentary requirement that converts a real entitlement into a paid duty.
A CUSMA claim requires a valid CUSMA Certification of Origin from the supplier, and without it CBSA applies the MFN rate even on goods that qualify[1].
Read that carefully, because it describes a pure and recoverable loss. The goods qualify. The preference exists. The importer pays the higher rate anyway, because a document was not obtained.
This happens for ordinary organisational reasons. The certification comes from the supplier, who has no direct incentive to provide it and may not understand what is being asked. The person who would notice its absence is in customs or logistics, and the person who deals with the supplier is in procurement. The duty differential appears in landed cost and is attributed to tariffs rather than to a missing form.
The recovery route exists: a missed free trade agreement claim can be amended through the CARM portal within four years of the import date, with CBSA assessing the difference between the MFN rate paid and the applicable rate and issuing a refund[1].
Our recommendation is that certification status be a field in the supplier master rather than a per-shipment question, and that obtaining it be part of supplier onboarding. It is a procurement task with a customs consequence, and it fails at the boundary between the two.
The Four-Year Window, Both Directions
The correction mechanism, and its three routes.
Commentary identifies three recovery routes, all within four years of the import date. Missed FTA claims: file an amendment through the CARM portal, and CBSA will assess the difference and issue a refund. Incorrect HS codes or customs value: the same four-year amendment window applies, and the process is to pull the original entry, identify the correct classification or valuation, and file the amendment with supporting documentation. Goods subsequently exported: a duty drawback claim[1].
The window is a rolling one, which has an underappreciated consequence. Each month that passes without a review, the oldest month of recoverable entries expires. A business that has never reviewed its classifications is not preserving an option; it is losing the oldest slice of it continuously.
That is the strongest argument for doing a review sooner rather than at a convenient time, and it is a straightforward calculation: the value of the oldest twelve months of entries, multiplied by the probability that any error exists, against the cost of the review.
The same window is available to CBSA on the assessment side, which is the symmetry this article opened with. An importer reviewing its own file may find both, and should expect to.
Drawback: One Hundred Percent
The relief programme most relevant to businesses that import and then export.
Canada's duty drawback programme allows importers to recover 100% of import duties paid on goods that are subsequently exported. Unlike the United States drawback limit of 99%, Canada allows full recovery, and claims must be filed within four years of the date of import. The programme covers categories including direct exports, meaning goods imported and then exported in the same condition[1]. CBSA directs importers to become familiar with the Duties Relief Program and the Duty Drawback Program[4].
The distinction between the two programmes is worth understanding. Drawback recovers duty already paid. Duties relief operates to avoid paying it in the first place, which is preferable on cash flow grounds for a business with predictable re-export volumes.
The population that should be looking at this is broader than it appears. It includes distributors who import for the Canadian market and re-export a portion, manufacturers who import components and export finished goods, businesses handling returns that go back across the border, and any operation where goods enter Canada and leave again.
Our observation is that drawback is under-claimed because it requires linking an export to a specific import, which is a data problem rather than a legal one. A business whose inventory system does not carry import entry references cannot easily prove the link, and the claim dies on evidence rather than entitlement.
Advance Rulings
The mechanism for resolving uncertainty before it becomes exposure.
CBSA operates an Advance Ruling programme for tariff classification and origin, and a National Customs Ruling programme, and publishes ruling letters with the applicant's consent[2].
The value is the same as in any other area of tax and regulatory practice: a determination obtained in advance converts an open position into a settled one, and does so before the volumes accumulate. An importer facing a genuinely uncertain classification on a product it will import for years is better served by resolving it once than by declaring and hoping.
The published rulings are also a resource in their own right. An importer can review how CBSA has characterised comparable goods, which is more informative than reasoning from the tariff schedule alone.
CBSA also publishes information on processing times and service standards for trade-related processes[2], which matters when planning around a ruling request.
Six Years And Four Years
A mismatch between two periods that is worth noticing.
Under the Customs Act, importers have a legal obligation to maintain records for six years[3]. The amendment and recovery window is four years from the import date[1].
So an importer is required to retain, for two additional years, records relating to entries it can no longer amend. We have not established the reason for the difference and readers should not infer one; retention obligations and assessment periods commonly differ, and there may be provisions extending assessment in particular circumstances that we have not examined.
The practical point stands regardless. Records must be kept for six years, they will be requested if a verification is opened, and the request will cover commercial invoices, bills of lading and proof of valuation method[6]. A business whose customs documentation lives in a broker's system rather than its own should establish whether it can produce six years of records independently, because the obligation is the importer's.
Classification Is Not A One-Time Decision
The operating discipline, stated well in one of the sources.
The recommended defence is described as not complicated: keep documentation organised as you go, use consistent and accurate HS codes across shipments, and do not treat classification as a one-time decision[6].
That last clause carries the most weight and is the least observed. Classification changes because products change: a supplier alters a component, a formulation is adjusted, packaging is reconfigured, or a product line is extended with variants that were never separately classified. The tariff schedule itself is also revised periodically.
An importer that classified a product correctly in 2021 and has declared it identically since may be declaring a materially different product under a stale determination, without any decision having been made to do so.
The process this implies is modest: a defined trigger requiring re-examination when a product specification changes or a new variant is introduced, a periodic review of the highest-volume classifications, and a single owner for the classification record. None of that is expensive relative to a four-year exposure running in both directions.
A Worked Case: The Review That Paid For Itself
A Canadian distributor importing from several countries, using a broker, with roughly four years of declarations in CARM. The reconstruction illustrates the routes rather than reporting a specific engagement, and no amounts are asserted.
The business has never reviewed its classifications. It commissions a review covering the four-year window and finds three categories of issue, which is the typical distribution.
A missed preference. A product line sourced from a CUSMA partner qualifies, but no Certification of Origin was ever obtained from the supplier, so CBSA applied the MFN rate[1]. Recoverable by amendment within four years, and fixable prospectively by adding certification to supplier onboarding.
An overpayment through classification. One product has been declared under a heading carrying a higher rate than the correct one. The same four-year amendment window applies, requiring the original entry, the correct classification and supporting documentation[1].
An underpayment. A second product has been declared under a heading carrying a lower rate than it should. This is the finding businesses least want and most need, because it is the one CBSA's automated review is designed to surface[2], and because self-correction is a materially better posture than discovery on verification.
Alongside these, goods that were imported and subsequently exported may support a drawback claim at 100% recovery within the same four years[1].
The transferable observation is that a review is not a recovery exercise. It is a reconciliation, and a business unwilling to find the third category should understand that declining to look does not make it invisible.
What To Do
Check the January 2026 priority list against your goods. Precious metals, CUSMA automotive origin, steel and aluminum surtaxes, energy commodities and nine classification categories. If you appear, review before you are reviewed.
Commission a classification and origin review across the open four years. The oldest month expires every month, and detection runs only in one direction without it.
Put Certification of Origin into supplier onboarding. Without it CBSA applies MFN even to qualifying goods, and the failure sits between procurement and customs.
Establish in writing who made each classification determination. The importer of record is liable regardless of who filed, and the common failure is that neither party believes it decided.
Move CARM account, security level and payment obligations into finance. Security is a credit facility, and inadequate security stops goods rather than merely costing money.
Test whether you can produce six years of records without your broker. The retention obligation is yours under the Customs Act.
Set a re-classification trigger on product changes. Specification changes, new variants and tariff revisions all invalidate a prior determination that nobody revisited.
Use advance rulings for genuinely uncertain classifications. Resolve once, before volume accumulates, and read the published rulings on comparable goods.
If you re-export, check drawback and duties relief. Canada recovers 100%, and the usual obstacle is linking exports to import entries in your own records.
The Limits Of This Analysis
Several caveats matter. This article draws on CBSA communications and professional and commercial commentary rather than the Customs Act, Customs Tariff and their regulations directly, and specific requirements should be verified against those authorities and current CBSA guidance. Several sources are logistics, sourcing or customs service providers with a commercial interest in importers commissioning reviews, and we have flagged them; the recoverability observations in particular come from such a source. We have not verified the four-year amendment window, the 100% drawback rate, or the six-year retention obligation against primary sources, and the relationship between the retention period and the amendment window is noted without explanation. The CBSA priority list is reported through a professional summary and is dated January 2026; priority lists are updated and the current version should be consulted. This article does not address valuation methodology in any detail, transfer pricing interactions with customs value, surtax and remission order mechanics, anti-dumping and countervailing duties, the Administrative Monetary Penalty System, non-resident importer structures, appeals and disputes procedure, or the specific rules of origin under any agreement. Nothing here is legal, customs or tax advice; engage a licensed customs broker and trade counsel on any specific determination.
Frequently Asked Questions
What determines how much duty I pay?
What changed under CARM?
Can I recover duty I overpaid?
Why am I paying MFN rates on goods that qualify for CUSMA?
Is my broker responsible if the classification is wrong?
How much duty drawback can I recover?
References
- Carra Globe. (2026, April 7). Reduce Import Duty Canada 2026: CARM, CUSMA, and the Methods That Cut Your Canadian Customs Bill, on the CUSMA Certification of Origin requirement and MFN default, automatic assessments and delayed releases, the three four-year recovery routes, and the 100% Canadian drawback rate against 99% in the United States. Note: published by a trade services provider with a commercial interest in duty recovery reviews. carraglobe.com/reduce-import-duty-canada-2026
- Canada Border Services Agency. CARM: Assess and Pay Duties and Taxes on Imported Commercial Goods, Government of Canada, on rule-based automation used to assess duties and identify issues, the Advance Ruling programmes for tariff classification and origin, published ruling letters, and service standards. canada.ca/en/border-services-agency/services/carm.html
- CustomsBrokerIndex. (2026, August). CARM Canada: Complete Importer Guide, on the six-year record retention obligation under the Customs Act, CBSA auditor access to transaction history, and the governing statutes including the Customs Act, Customs Tariff and Excise Tax Act. Note: a customs brokerage directory. customsbrokerindex.com/blog/carm-canada-the-complete-guide-for
- Canada Border Services Agency, via Newswire. (2026, March 25). The CBSA Shares Tips on Importing Commercial Goods to Canada, on the three determinants of customs duties, the 5% GST, other government department requirements, and the Duties Relief and Duty Drawback Programs. newswire.ca/news-releases/the-cbsa-shares-tips-on-importing-commercial-goods-to-canada-832987030.html
- KPMG Canada. (2026, January 9). Importers: Assess Risk with CBSA's Audit List, TaxNewsFlash-Canada No. 2026-04, on the January 2026 compliance priority list including precious metals, CUSMA automotive rules of origin, steel and aluminum surtaxes, energy commodities and nine classification categories, the origin priority, the assessment and refund consequences, and CARM's full implementation in October 2024. assets.kpmg.com/.../ca-importers-assess-risk-with-cbsas-audit-list.pdf
- Epic Sourcing. (2026, August). What Is CARM? CBSA's Canadian Importer Guide 2026, on the shift of responsibility from broker to importer, the visibility of patterns to CBSA's systems, documentation requested on verification, and the recommendation not to treat classification as a one-time decision. Note: published by a sourcing services provider. epicsourcing.ca/post/carm-cbsa-canadian-importers-guide
- Mexicom Logistics. (2026, June 18). CARM Explained: What Importers Need to Know About Canada's Customs System, on immediate financial and audit consequences of errors, importer-managed bonding for Release Prior to Payment privileges and its liquidity impact, and the evolution of brokers into compliance advisors. Note: published by a logistics provider. mexicomlogistics.com/carm-explained-what-importers-need-to-know-about-canadas-customs-system
This article discusses Canadian customs administration and is provided for general informational purposes. It is not legal, customs or tax advice. Requirements derive from the Customs Act, Customs Tariff and their regulations, which should be consulted directly. Several sources sell services related to the reviews recommended here. Engage a licensed customs broker and trade counsel on any specific determination.