Reason to Believe: The 90-Day Correction Obligation Under Section 32.2 (and the 4-Year Reach-Back)

Once a Canadian importer has reason to believe that a declaration of origin, tariff classification, or value for duty is incorrect, Section 32.2 of the Customs Act requires a correction within 90 days. That obligation can reach back four years across affected entries, and missing the deadline can lead to unpaid duties, interest, and escalating Administrative Monetary Penalty System (AMPS) penalties.

The key question is when “reason to believe” arises. It can be triggered by specific information such as a CBSA ruling, supplier notice, corrected invoice, audit finding, or other evidence showing that a past declaration was wrong. From that point, the importer must identify the affected entries, determine how far the correction reaches, and complete the required correction within the statutory window.

What Section 32.2 Turns Into a Legal Duty

Section 32.2 creates a self-correction duty. It does not ask importers to fix errors when convenient; it requires the correction once the importer, owner, or authorized person has reason to believe a declaration is incorrect, and it sets hard parameters around that requirement.

The statute breaks down into a few load-bearing rules. Subsection 32.2(1) governs corrections to preferential origin claimed under a free trade agreement. Subsection 32.2(2) covers everything else: non-preferential origin, tariff classification, and value for duty. Both run on the same 90-day deadline, measured from the date reason to believe arises, and the duty ends four years after the goods were accounted for under subsection 32(1), (3), or (5). That four-year window is the reach-back.

Two limits matter as much as the deadlines. First, Section 32.2 does not apply to corrections that would produce a refund of duties. A change that lowers your duty bill is not a Section 32.2 correction at all; it runs through Section 74, which carries its own, often shorter, deadlines. Second, once you file a correction after the prescribed day, CBSA treats it as a re-determination under Paragraph 59(1)(a), which opens a fresh four-year period in which CBSA may re-examine origin, classification, or value on the same goods.

What Triggers "Reason to Believe"

CBSA Memorandum D11-6-6 centers the whole standard on "specific information": concrete information about origin, classification, or value that indicates a declaration is incorrect. The memorandum enumerates the sources that qualify, and understanding them is how you date the 90-day clock accurately. Specific information can come from any of the following:

• Prima facie legislative provisions: Tariff or origin rules that are evident and transparent enough to plainly show a declaration cannot be correct.

• Formal CBSA assessment documents: Determinations, re-determinations, and further re-determinations.

• Final tribunal or court decisions: Where the importer was appellant, respondent, or intervener.

• Information from exporters or suppliers: Cancelled certificates of origin, corrected invoices, retroactive price changes.

• Written CBSA communications: Addressed to the importer, including national customs rulings, advance rulings, trade compliance verification final reports, directed compliance letters, and exporter origin verification notifications.

• Final internal or external audit reports: Initiated by or for the importer that identifies errors.

• Knowledge of diversions: Where goods no longer meet the conditions for conditional relief or concessionary tariff treatment.

The obligation does not stop at the single SKU or transaction where the information surfaced. Reason to believe extends to "same and similar goods," meaning identical or similar models with the same function that belong under the same 8-digit tariff item, and to "same issues," meaning the same origin, classification, or valuation requirement. When a supplier notice or ruling shows one product line was misclassified, the duty is to correct every affected line that shares the issue, not just the entry that tipped you off. Automated classification tooling earns its place here, because finding every same-and-similar item across a large catalog by hand is where manual reviews miss lines.

Internal audits are a double-edged trigger. A final report from an importer-initiated review can itself be the specific information that starts the clock, but only when three conditions hold: no prior specific information existed, CBSA has not already launched a trade compliance verification, and the report identifies only section 32.2 corrections (amounts payable or revenue-neutral, not refunds). D11-6-10 adds that the report must be a substantive audit of customs accounting, with detailed issue descriptions, scope, error findings, and legislative support. Where those conditions hold, CBSA may treat the report date as the first trigger and limit corrections forward rather than back four years.

When the 90-Day Clock Starts Running

The clock starts on the date the importer has specific information that a declaration is incorrect, not on the date CBSA gets involved. D11-6-10 states plainly that the 90-day limit begins on the date the importer has reason to believe. In practice, that means dating each trigger to the day the information became available:

• The date a supplementary invoice showing a price increase on already-declared goods is received.

• The date of accounting, where valuation elements such as assists were known then and simply omitted.

• The date an advance ruling or national customs ruling is issued, after which the ruling becomes your specific information going forward.

• The date a supplier notifies you that a certificate of origin is withdrawn or a product description changes in a way that affects classification or origin.

A frequent and expensive mistake is assuming the clock only starts when CBSA makes contact. A trade compliance verification final report can start the clock, but only where CBSA finds no evidence of earlier specific information. In that case, the report date becomes the reason-to-believe date, and you have 90 days to correct every incorrect declaration across the verification period named in the notification letter and going forward. If CBSA instead finds you had specific information earlier, from a prior ruling, assessment, or supplier notice, it measures the reassessment from that earlier date, and you may owe corrections up to four years back to that point.

Tribunal history feeds the same analysis. A final Canadian International Trade Tribunal or court decision in which the importer participated is an enumerated source of specific information when it relates to the importer's goods and issues. The Frito-Lay and later Bri-Chem cases confirmed that corrections to tariff treatment and classification can be made over several years rather than being cut off at one.

What Has to Be Corrected, and How to File It

Once reason to believe exists, the correction is not a light-touch amendment. The importer must file in the prescribed form and manner, pay any duties owing plus applicable interest, and extend the fix across all same and similar goods and same issues. Corrections are submitted as Customs Accounting Declaration (CAD) adjustments; D11-6-6 and D17-2-1 identify a properly completed CAD as the mechanism.

Timing and filing mechanics carry a few traps worth memorizing:

1. Confirm the reason-to-believe date first: Every downstream deadline runs from it, so log the source and date of the triggering information before anything else.

2. File the CAD within 90 days: The filing date is the date the CAD is completed in CARM, mailed by registered post or courier, or delivered by hand to CBSA.

3. Watch the calendar edge: If the 90th day falls on a Saturday, Sunday, or holiday, the deadline moves to the next business day.

4. Pay duties and interest at filing: Interest is calculated under the interest provisions for determinations and re-determinations.

5. Expect a live reassessment window: CBSA may treat the correction as a re-determination under paragraph 59(1)(a) and further re-determine within four years.

Corrections also come in waves. CBSA's revised D11-6-6 requires subsequent corrections when new information emerges on the same issue after the first fix. A worked example: you correct understated invoice prices within 90 days, then months later year-end transfer pricing adjustments push the same goods' values higher still. CBSA expects a second correction within 90 days of that new information, again within the four-year limit. Subsequent corrections are themselves re-determinations, and they stop only once CBSA makes its own further re-determination under Section 59 or the matter is superseded by a Section 60 or 61 decision. Filing these CAD adjustments cleanly in CARM is now the operational front end of the process, so the accounting data behind each correction needs to be defensible on its face.

How Far the Four-Year Reach-Back Reaches

Subsection 32.2(4) fixes the outer limit: the obligation ends four years after the goods were accounted for under Subsection 32(1), (3), or (5). The reach-back clock runs per entry from its own accounting date, so once more than four years have passed for a given entry, Section 32.2 no longer imposes a correction duty on it. D11-6-10 frames the same rule from the other direction: corrections reach back to the date of specific information, up to a maximum of four years.

How far back you actually go depends on CBSA's reassessment policy, which sorts cases into three scenarios:

• No prior specific information: If CBSA finds nothing that gave you reason to believe before a trade compliance verification, you correct only for the verification period and going forward.

• Specific information was available earlier: If a ruling, prior assessment, supplier notice, or other criterion applied earlier, you correct from the date of that specific information, up to four years, whether or not duties are payable.

• Prima facie legislative provision only, no duties owing: Where the only earlier trigger is a plain legislative provision, and the correction produces no customs duties (or only GST) payable, CBSA may limit the reassessment to the last completed fiscal period, particularly for a GST registrant entitled to input tax credits.

The reach-back also interacts with refund timing, and the two should never be blended. Corrections that are revenue-neutral or that increase duties fall under Section 32.2 and its 90-day and four-year rules, while corrections that decrease duties are Section 74 refund claims with their own, often shorter, deadlines. CBSA's Customs Notice 16-32 confirms that a revenue-neutral change, such as switching from MFN to a zero-rate FTA treatment, is processed under Section 32.2, not Section 74, and must still meet the 90-day window.

The Penalty Exposure for Missing 90 Days

Timely self-correction inside the 90-day window generally avoids AMPS penalties. The penalties attach to the failure to correct after having reason to believe, and they climb with repetition. Two contraventions anchor this area: C352, which covers a failure to pay duties owing on a required tariff classification correction within 90 days, and C082, which covers the revenue-neutral case where no duties or taxes are owed.

C352 is graduated, and the AMPS penalty levels escalate quickly:

The first-occurrence figure depends on whether reason to believe arose from a prima facie legislative provision or from other specific information. Senior officers are directed to document, for each error, what constituted reason to believe and when it occurred, because that record both supports the assessment and sets the level for the next one. Every uncorrected error today raises the price of the next.

Two misconceptions can increase an importer’s exposure under Section 32.2.

1. Small or revenue-neutral errors still need to be corrected:

Once reason to believe exists, CBSA expects incorrect declarations to be corrected where the change results in duties payable or is revenue neutral. Repeated failures can still fall within C352 or C082, even where the individual errors are small.

2. Correcting an error does not automatically trigger a penalty:

Proactive correction within the 90-day window generally avoids the penalty. Importers that have already missed the deadline may be able to seek relief through CBSA’s Voluntary Disclosure Program under Memorandum D11-6-4, which can provide relief from penalties and punitive interest where the disclosure qualifies.

Because the penalty analysis depends heavily on when reason to believe arose, documentation matters. Importers should keep a dated record of rulings, verification reports, supplier notices, and internal-audit findings so they can show when the 90-day period began and when the correction was filed. A standing tariff-audit workflow can help surface discrepancies regularly and maintain that record before a verification letter arrives.

Building a Correction Process Brokers and Importers Can Defend

Canadian importers rarely run section 32.2 alone; the correction, the reach-back scoping, and the CARM filing usually pass through a customs broker. The brokers who handle it well treat reason to believe as a monitored event rather than a surprise: they track the sources of specific information, date each one, scope same-and-similar goods before CBSA does, and file the CAD adjustments inside the window with duty and interest attached. That discipline keeps a routine price adjustment from turning into a graduated AMPS assessment, and it is where classification volume becomes the bottleneck, because scoping a four-year population by hand across thousands of lines is slow and error-prone. 

Gaia Dynamics builds tools for customs brokers that classify and reclassify at machine speed, so the population behind a correction can be identified, priced, and documented before the 90-day clock runs out.

Discover how Gaia Dynamics helps brokers identify every affected entry, validate classifications at scale, and build correction packages that stand up to CBSA scrutiny. 

Frequently Asked Questions 

Does a good-faith difference of opinion with CBSA count as reason to believe?

Not automatically. A well-supported difference of opinion on an interpretive issue may not create reason to believe. Because the distinction is fact-specific, importers should document their position and consider seeking an advance ruling.

If a correction would reduce my duties, am I required to file it under section 32.2?

No, Section 32.2 does not apply to corrections that result in a duty refund. Those must be pursued as refund claims under section 74, which has its own filing deadlines. Section 32.2 applies to corrections that increase duties or are revenue neutral. 

Can the 90-day deadline be extended?

Sometimes. CBSA may grant a limited extension in exceptional circumstances, such as a natural disaster or unusually high correction volumes. Because extensions are discretionary, importers should treat the 90-day deadline as firm. 

Does using the Voluntary Disclosure Program erase the penalties?

Not automatically. A valid voluntary disclosure may reduce or waive penalties and punitive interest, but only if it is complete and submitted before CBSA begins enforcement action on the issue. 

Do GST-only errors have to be corrected?

Yes, CBSA expects corrections where GST-only errors create an amount payable or are revenue neutral. It also expects corrections where GST was over-assessed, even if the customs duty itself does not change.