Last verified: August 26, 2026. Mexico's tariff story is often reduced to “25% tariffs,” but that shorthand is now misleading. The broad 2025 emergency tariff was narrowed almost immediately to non-USMCA trade and then terminated in February 2026. Mexico avoided a broad retaliatory tariff package, while U.S. sector tariffs on metals and vehicles continued under different laws. This chronology keeps those tracks separate.

The United States and Mexico share highly integrated automotive, electronics, machinery, agriculture, energy, and consumer-goods supply chains. USMCA rules of origin determine whether much of that commerce receives preferential treatment. Consequently, the difference between “made in Mexico” and “qualifies under USMCA” is legally and commercially important.

January–February 2025: a tariff threat becomes a security negotiation

January 20, 2025 — the second Trump administration begins

After taking office, President Trump made border enforcement, migration, fentanyl, and trade deficits central to the administration's Mexico policy. The administration presented tariffs as leverage for additional action; President Claudia Sheinbaum's government argued for cooperation, shared responsibility, and respect for sovereignty while preparing possible trade responses.

February 1 — 25% additional tariffs are ordered

Using IEEPA, President Trump ordered an additional 25% tariff on products of Mexico, initially effective February 4. The order cited illegal migration and illicit drugs as the emergency. It was a country-focused border measure, distinct from the later Section 232 tariffs on steel, aluminum, and vehicles. The White House fact sheet records the administration's rationale.

February 3 — a one-month pause and 10,000 National Guard members

Following a call between the presidents, implementation was postponed until March 4. Mexico agreed to deploy 10,000 National Guard members to its northern border to combat drug trafficking, particularly fentanyl, while the United States committed to work on weapons trafficking into Mexico. The countries established working groups on security and trade. Mexico's official account and the U.S. Federal Register notice document the agreement.

March 2025: two days of broad tariffs, then the USMCA exemption

March 4 — the 25% tariff takes effect

The United States activated the additional 25% duty after the pause expired. President Sheinbaum announced that Mexico would prepare tariff and non-tariff measures and planned to present them publicly on March 9. That announcement was a response plan, not evidence that Mexico had already placed a broad tariff on U.S. goods.

March 6–7 — USMCA-compliant goods are carved out

After another presidential call, the United States amended the order. Beginning March 7, goods qualifying for USMCA preferential treatment were exempt. Non-qualifying Mexican goods remained subject to 25%, while non-qualifying potash was reduced to 10%. Mexico then did not proceed with the broad retaliation it had been preparing. President Sheinbaum described the result as respectful treatment and confirmed that USMCA products would not pay the border tariff in Mexico's March 6 statement.

The exemption created a strong incentive to claim USMCA treatment, but qualification is not automatic. A shipment needs the required origin facts and certification, and the product must satisfy its applicable rule of origin. Companies unable to support a claim remained exposed to the additional duty.

March 12 — steel and aluminum tariffs still apply

Separate 25% Section 232 tariffs began on covered steel and aluminum from all suppliers, including Mexico. The March 7 USMCA exemption to the border tariff did not erase these sector measures. Mexico called the action unjustified and pursued consultations, but it did not answer with the kind of broad countertariff list implemented by Canada.

April–June 2025: the automotive sector and metals escalation

April 3 and May 3 — passenger vehicles, light trucks, and parts

The United States imposed a 25% Section 232 duty on covered passenger vehicles and light trucks from April 3, followed by covered auto parts from May 3. Mexico's integrated auto industry received a content-based mechanism: for a USMCA-qualifying vehicle, an approved importer could apply the 25% duty to the value of non-U.S. content rather than the full customs value. USMCA-qualifying parts initially received distinct treatment. The controlling proclamation shows why the effective burden varies by model and supply chain.

April 2 reciprocal-tariff program — Mexico is handled through the border order

The global reciprocal-tariff announcement did not impose an additional blanket reciprocal rate on Mexico while the IEEPA border action remained in force. It preserved the USMCA exemption and the 25% rate on non-qualifying Mexican goods under the border framework. Tariff percentages from the two programs therefore should not be mechanically added together.

June 4 — covered steel and aluminum rise to 50%

The U.S. Section 232 rate on covered steel and aluminum doubled from 25% to 50%. Mexico's government described the increase as unfair and unsustainable because of the countries' integrated production and the U.S. trade surplus in steel products cited by Mexican officials. Mexico continued seeking a negotiated arrangement rather than launching broad retaliation. Its June 4 statement records that position.

July–November 2025: a threatened 30% tariff is deferred

July 12–31 — 30% is threatened, then postponed for 90 days

President Trump threatened a 30% tariff on Mexican products beginning August 1. On July 31, the presidents announced a 90-day negotiating period instead. The existing arrangement remained: qualifying USMCA goods retained preferential treatment, non-qualifying goods faced the 25% IEEPA border tariff, and sector tariffs continued separately. Mexico also agreed to keep addressing non-tariff barriers. The key point is that the threatened blanket 30% rate did not take effect on August 1. Mexico's official statement confirms the 90-day outcome.

November 1 — heavy vehicles and buses enter the Section 232 framework

The United States applied a 25% Section 232 tariff to covered medium- and heavy-duty vehicles and parts and 10% to buses. USMCA-qualifying trucks could use an approved method applying the 25% duty to non-U.S. content, while non-qualifying vehicles generally faced the tariff on full value. This mattered to Mexico's commercial-vehicle supply chain and reinforced the growing importance of content tracing.

February–July 2026: broad emergency tariffs end, other tools replace them

February 20 — the Supreme Court rules IEEPA does not authorize tariffs

The U.S. Supreme Court held in Learning Resources, Inc. v. Trump that IEEPA did not give the President tariff authority. The administration then terminated the additional ad valorem duties imposed under IEEPA. For Mexico, this ended the 2025 border-tariff framework—including the 25% rate on non-USMCA goods—as a current legal measure. It did not affect tariffs imposed under other statutes. The primary sources are the Court's opinion and the February 20 executive order.

February 24–July 24 — a temporary Section 122 surcharge

The President imposed a 10% surcharge for 150 days under Section 122 of the Trade Act. Goods receiving duty-free USMCA treatment and products already covered by Section 232 were among the exemptions. The temporary surcharge expired at 12:01 a.m. EDT on July 24, 2026, because Congress did not extend it. It is historical, not part of the current tariff stack.

June 8 — revised metals treatment

A revised Section 232 framework introduced multiple rate tiers across metals and derivative products. For specified covered products from Mexico that qualify under USMCA, a 25% additional duty applies to non-U.S. content, subject to a minimum total effective duty of 15%. Other covered products remain within broader 50%, 25%, or 15% tiers depending on classification and metal content. This is not a universal 25% Mexico rate; product-level analysis is required. See the June proclamation.

July 1 — USMCA remains in force, but annual reviews begin

The first six-year USMCA joint review concluded without all three parties agreeing to a new 16-year extension. The agreement did not expire: its current term continues to 2036, and the parties now conduct annual joint reviews under Article 34.7. Mexico's Economy Ministry said more than 80% of Mexican exports continued to enter the United States duty-free and identified continued work on rules of origin, steel and aluminum, agriculture, economic security, and regulatory compatibility. The Mexican review statement and USTR's bilateral-round summary describe the negotiating agenda.

July 23–24 — Mexico enters the 10% Section 301 group, with USMCA goods exempt

After investigations into whether trading partners effectively prohibited imports made with forced labor, USTR imposed new Section 301 duties on 60 economies. Mexico was assigned a 10% rate, rather than the 12.5% rate for many economies. Crucially, USMCA-compliant goods and specified products are exempt. This final action replaced the temporary baseline after the Section 122 surcharge expired. USTR's July 23 release names Mexico in the 10% group and explains the exemptions.

Why Mexico did not mirror Canada's retaliation

Mexico repeatedly reserved the right to use tariff and non-tariff measures, but its central strategy was negotiation. The government used border-security commitments, presidential calls, technical working groups, and USMCA's legal structure to preserve preferential access for qualifying goods. This reduced the risk of immediate tariff escalation against U.S. exports but did not shield Mexico's steel, aluminum, and vehicle sectors from U.S. Section 232 actions.

That strategy also reflects exposure: a large share of Mexico's exports goes to the United States, and many Mexican plants rely on U.S. components. Retaliation could raise costs inside the same cross-border supply chains Mexico sought to protect. This is analytical context, not proof that negotiation eliminated the costs of U.S. sector tariffs.

August 24, 2026: Mexico says negotiations continue

President Sheinbaum said Mexico and the United States remained in talks about U.S. concerns, including possible transshipment through Mexico. She described the current broad tariff treatment as a 10% U.S. tariff on exports that do not qualify under USMCA, alongside continuing sector measures, and said Mexico expected negotiations to continue. This statement did not announce a new Mexican retaliatory tariff package or a final bilateral agreement. See the Mexican presidency's August 24 press-conference transcript.

Trade data: what the latest complete month shows

U.S. Census Bureau goods data for May 2026 show U.S. exports to Mexico of approximately $33.1 billion and imports from Mexico of $54.2 billion, a monthly U.S. goods deficit of about $21.1 billion. From January through May, exports were approximately $161.7 billion and imports $242.9 billion, a deficit of about $81.2 billion. The figures are nominal, not seasonally adjusted, and cover goods rather than services. Timing, inventories, exchange rates, demand, and supply-chain changes can all affect monthly trade; the numbers should not be treated as a clean estimate of tariff effects. Source: U.S. Census Bureau country trade workbook.

Current situation as of August 26, 2026

  • Ended: the broad 2025 IEEPA border tariff on Mexican goods ended on February 20, 2026. The threatened 30% rate from August 2025 never took effect.
  • Expired: the temporary 10% Section 122 surcharge expired July 24, 2026.
  • In force: the Section 301 baseline is 10% for covered Mexican goods, but USMCA-compliant goods and specified products are exempt.
  • In force: Section 232 tariffs continue for covered metals, passenger vehicles, light trucks, auto parts, medium- and heavy-duty vehicles, parts, and buses. Rates and valuation depend on classification, USMCA origin, U.S. content, and exclusions.
  • Mexico's response: Mexico has not implemented a broad retaliatory tariff package comparable to Canada's. It continues to negotiate sector and non-tariff issues.
  • USMCA: the agreement remains in force under its current term through 2036. Because no 16-year extension was agreed in July 2026, annual reviews continue.
  • No Canada-style Section 338 announcement: as of the cutoff, the July 20 Canada-specific 50% proclamations did not apply to Mexico.

Bottom line: most qualifying Mexican exports continue to rely on USMCA for duty-free treatment from the current countrywide baseline, but “USMCA-compliant” does not guarantee freedom from every tariff. Sector measures can still apply, especially in metals and vehicles. Importers should verify tariff classification, origin qualification, content calculations, and current customs instructions for each shipment rather than relying on a single headline rate.