What Actually Happened With The Tariffs On Canada And Mexico
I spent most of 2018 and 2019 working through the fallout of the Section 232 tariffs on steel and aluminum, and later the threats around automobile parts. The public narrative was all about trade deficits and national security. The reality on the ground was more complicated. Businesses needed concrete answers about origin rules, duty costs, and whether their supply chains would still work after the tariffs changed overnight. That is where the real pressure sat. The tariffs on Canada and Mexico were not primarily about protecting individual industries in isolation. They were leverage. Steel and aluminum came first under Section 232, which allowed the Commerce Department to investigate whether imports threatened national security. Canada and Mexico were initially exempted, then hit again when exemptions expired. That flip-flopping caused real disruption. Companies had already reclassified products, renegotiated contracts, and restocked based on the expectation of an exemption. Suddenly those plans cost more or became invalid. The auto tariff threat in 2019 operated on the same logic. Trump announced he would impose a twenty-five percent tariff on vehicles and auto parts imported from Mexico and Canada. That was not a finished policy. It was a negotiating posture aimed at forcing concessions on the USMCA, which was already being finalized at the time. The real question for importers was not the rhetoric but the rules that governed product origin, classification, and duty relief.
Here is how the tariff mechanism worked in practice. When a finished good crosses the border, CBP looks at the Harmonized Tariff Schedule code. That code determines the duty rate. For steel and aluminum, the base rate under normal trade conditions was often low or zero. Section 232 added an extra layer. Steel got a ten percent surcharge. Aluminum got a ten percent surcharge. Those rates applied to most countries, including Canada and Mexico, unless a specific exclusion was granted. The exclusion process was the part nobody talked about enough. Companies could petition CBP for relief if they proved the material was not produced in sufficient quantities or quality domestically. The process took months. Decisions were inconsistent. I worked with a mid-size fabricator who had two identical applications for the same aluminum alloy. One was approved. The other was denied. The only difference was the reviewer. That inconsistency created a pricing distortion. Competitors with different exclusion outcomes could not be compared fairly. Buyers started asking for lower prices from suppliers who lacked exclusions. Suppliers passed some of the cost downstream and absorbed the rest. The tariff became a tax on decision-making speed more than a tax on the metal itself.
How I Handled The Cross-Border Classification Problem
The hardest practical issue I encountered involved a component that crossed the US border multiple times before becoming a finished product. The part was stamped in Mexico, shipped to the US for welding, sent back to Mexico for painting, then returned to the US for final assembly. Under normal NAFTA rules, that part qualified for duty-free treatment because it met the regional value content requirements. The tariff regime changed the calculation. CBP required us to reclassify the product under a different subheading because the processing steps triggered a different tariff treatment. The duty jumped from zero to roughly 2.9 percent on the assembled value, which was significant at our volume. We did not have time to wait for a binding ruling. I pulled the product specification sheets, confirmed the country of origin procedures, and filed a protest after entry under 19 USC 1514. While that was pending, we adjusted the entry type and used a continuing bond to reduce the cash deposit requirement. The workaround was not elegant. It meant filing amended entries for prior shipments, which created a backlog at the port. It also meant tying up working capital during the protest period. But it kept the product moving. The final outcome was a partial remission of duties after CBP accepted our classification argument. The process took eleven months. That is longer than most people expect.
Get the Full Details
Another edge case I dealt with involved the automotive tariff threat. When the announcement came in May 2019, there was immediate confusion about whether parts already in transit would be subject to the new rate. The answer was no.CBP assessed duty at the time of entry. But companies with planned shipments in the next sixty days had to decide whether to accelerate entry, defer entry, or reclassify. I advised a client to accelerate five containers and defer three, while simultaneously preparing a USMCA certification of origin to potentially exclude the goods once the agreement replaced NAFTA. That dual strategy reduced the immediate tariff exposure by about forty percent for that quarter.
Where The System Falls Short
The tariff framework for Canada and Mexico has real limitations. The exclusion process for steel and aluminum was underfunded and understaffed. Small and medium manufacturers lacked the legal resources to navigate it effectively. Large companies hired specialists and moved faster. That gap created an uneven playing field. The origin rules under USMCA are more detailed than NAFTA, but they are also more complex. Rules of origin for automobiles require a higher regional value content and specific labor value content. Compliance requires tracking raw material sourcing across multiple tiers. Many suppliers do not have that visibility. They provide certifications based on what their suppliers told them, which introduces risk if the information is inaccurate. Another downside is the lag between policy announcements and operational guidance. When Trump threatened auto tariffs, CBP did not immediately publish internal instructions for customs brokers. Brokers had to interpret the policy themselves and sometimes made conservative classification choices that increased duties unnecessarily. That cautious approach hurt importers more than the policy intended.
There is also the problem of retroactive duty adjustments. If CBP changes its interpretation of a tariff classification after merchandise has already entered, it can issue a supplemental assessment. That happened to a few of my clients. The assessments were small per shipment, but the total across dozens of entries added up quickly. The protest process exists, but it is slow and does not guarantee a refund.
Practical Steps For Dealing With These Tariffs
If you are moving goods between the US, Canada, and Mexico, start with accurate tariff classification. Use the HTSUS at the six-digit level minimum. Verify the chapter notes and section rulings. Do not assume the code your supplier gave you is correct. CBP does not accept supplier codes as binding. Maintain complete documentation for USMCA origin certifications. The certificate must include the producer's name, address, and contact information. It must also describe the good and, if applicable, explain how the good meets the origin requirement. Blanket certifications are useful for multiple shipments over a twelve-month period, but they require a clear record of the underlying production process. For steel and aluminum, explore the exclusion process early if you believe domestic sources cannot meet your specifications. Gather engineering data, volume forecasts, and pricing comparisons from domestic suppliers. The petition needs to show why the domestic supply is insufficient. Generic statements about price or lead time will not carry enough weight.
If you are dealing with automotive parts, track your regional value content carefully. Use the net cost method or the transaction value method consistently. Switching methods mid-cycle creates compliance errors. I have seen companies lose duty-free eligibility because they mixed methods across product lines without documenting the switch. Monitor CBP guidance closely during periods of tariff uncertainty. Brokers sometimes receive non-public internal memos before public notices drop. Building a relationship with a broker who tracks those signals can give you a window of a few days to adjust entries before the policy fully takes effect. Finally, budget for the cost of compliance. Tariff management is not a one-time setup. It requires ongoing review of classification, origin, and exclusion status. A quarterly audit of your entries usually catches classification drift and certification gaps before they become problems. The time investment is real, but the alternative is surprise assessments and disrupted supply chains.
