Customs duties and taxes audit
Customs Duties and Taxes Audit: Are You Paying More Than You Should?
How post-entry customs auditing can uncover overpayments, identify refund opportunities, and improve import cost control.
· TriangleAudit
How post-entry customs auditing can uncover overpayments, identify refund opportunities, and improve import cost control.
For companies importing goods into Canada and the United States, customs duties and taxes represent a significant component of landed costs. Yet many businesses pay these charges without independently verifying whether the correct tariff classifications, duty rates, exemptions, and trade agreements were applied.
Customs clearance does not necessarily mean customs charges were optimized or accurately assessed.
A post-entry customs audit can help businesses identify discrepancies, recover eligible overpayments, and improve visibility into their import costs.
Where Do Customs Duty and Tax Errors Occur?
Customs duties and taxes are calculated using multiple factors, including product classification, country of origin, customs valuation, and applicable trade agreements.
Errors or missed opportunities can arise from:
- Incorrect HS classifications: Products classified under tariff codes that carry higher duty rates than the legally applicable classification.
- Missed preferential tariff treatment: Eligible imports not receiving preferential rates under agreements such as CUSMA/USMCA.
- Incorrect customs valuation: Errors in declared values or the treatment of freight, insurance, and other applicable costs.
- Unclaimed exemptions or relief: Eligible duty exemptions, remissions, or other relief provisions not applied.
- Duplicate or incorrect billing: Discrepancies between customs entries, government assessments, payments, and carrier or customs broker invoices.
These issues can increase landed costs, create compliance risks, and reduce visibility into the true cost of imported products.
What Does the Data Tell Us?
Government customs verification programs demonstrate that classification and compliance errors occur, although they do not establish a universal overpayment rate.
For example, the Canada Border Services Agency (CBSA) reported errors in 25 of 28 closed verification cases involving bags and 10 of 20 cases involving gloves in selected third-round tariff classification verifications.
These findings represent targeted, risk-based investigations—not the error rate across all Canadian imports. Furthermore, customs errors can result in either underpayments or overpayments.
The important takeaway is that customs entry accuracy should be verified rather than assumed.
The CBSA and U.S. Customs and Border Protection (CBP) also provide mechanisms for correcting qualifying customs entries and recovering eligible duties paid in excess.
How Does a Customs Duties and Taxes Audit Work?
TriangleAudit applies a structured approach to reviewing import charges, connecting product information, customs declarations, applicable tariff treatment, and amounts invoiced.
1. Validate Product Classification
Review the product catalogue, descriptions, specifications, and HS classifications to determine whether the appropriate tariff codes have been applied.
2. Verify Applicable Duties and Taxes
Compare assessed duties and taxes against applicable tariff rates, preferential trade agreements, exemptions, and customs valuation rules.
3. Reconcile Customs Entries and Invoices
Match customs broker and carrier invoices against customs entry documentation, government assessments, and payment records to identify discrepancies.
4. Identify Recovery Opportunities
Document potential overpayments and assess whether corrections, refunds, duty drawback, or other applicable recovery mechanisms may be available.
5. Turn Audit Findings into Spend Intelligence
Analyze duties and taxes at the product, SKU, supplier, country-of-origin, and shipment levels to identify recurring discrepancies and opportunities to improve landed costs.
How Much Could Your Business Recover?
There is no reliable, universally applicable percentage of customs duties and taxes that businesses overpay.
The amount depends on factors such as product classifications, import origins, tariff exposure, customs valuation practices, and historical entry accuracy.
Rather than assuming a fixed recovery percentage, businesses can establish a more reliable estimate through a representative audit of their import transactions.
For example, a company paying $2 million annually in customs duties and taxes could use hypothetical recovery scenarios to understand the financial impact:
| Illustrative recovery scenario | Potential recovery |
|---|---|
| 1% | $20,000 |
| 3% | $60,000 |
| 5% | $100,000 |
These figures are hypothetical illustrations, not industry averages or guaranteed recoveries. Actual results require transaction-level verification, eligibility assessment, and compliance with applicable refund deadlines.
Beyond Recovery: Turning Customs Data into Cost Intelligence
The long-term value of customs auditing extends beyond identifying individual overpayments.
By organizing customs entry and invoice data at the charge and product level, businesses can:
- Understand duties and taxes paid by SKU, supplier, origin, and destination.
- Identify products with higher-than-expected import costs.
- Compare actual duty treatment against applicable tariff provisions.
- Monitor recurring classification and customs billing discrepancies.
- Improve landed-cost forecasting, procurement decisions, and financial controls.
This transforms customs invoice data from an accounts payable record into a valuable source of business intelligence.
How TriangleAudit Helps
TriangleAudit combines invoice auditing, customs duties and taxes validation, recovery support, and spend intelligence into a tailored solution.
Our approach connects what was commercially agreed, what was imported and declared, and what was ultimately invoiced and paid.
By validating charges and analyzing historical customs data, we help businesses identify potential overpayments, strengthen financial controls, and uncover opportunities to optimize import costs.
Are You Paying More Customs Duties and Taxes Than Necessary?
Audit Duties & Taxes Paid Against Applicable Classifications and Rates.
Discover potential overpayments, identify eligible recovery opportunities, and gain greater visibility into your import costs.
Request a Customs Duties & Taxes Audit with TriangleAudit.
References
- Canada Border Services Agency (CBSA) — Trade Compliance Verification Priorities and verification results, including tariff classification findings.
- CBSA — Memorandum D6-2-3, Refund of Duties.
- CBSA — Customs Tariff and rules governing preferential tariff treatment.
- U.S. Customs and Border Protection (CBP) — Post-summary corrections, protests, and refund procedures.
- CBP — Duty Drawback Program and applicable provisions under 19 U.S.C. § 1313.
Disclaimer: Customs classification, preferential tariff eligibility, refunds, and drawback are subject to applicable legislation, supporting documentation, filing deadlines, and customs authority decisions. TriangleAudit's audit findings do not guarantee refunds or replace required legal or customs compliance determinations.
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