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Mexico ratification of UK accession to CPTPP

Date of publication: July 1, 2026.

Introduction

Mexico has ratified the United Kingdom’s accession to the Comprehensive and Progressive Agreement for Trans-Pacific Partnership (CPTPP). As a result, CPTPP tariff preferences between the UK and Mexico enter into force from 22 June 2026, subject to applicable tariff staging, rules of origin, certification requirements and tariff-rate quota conditions.
HM Revenue & Customsconfirmed the previous CPTPP tariff preference arrangement for all CPTPP members was due to end on 21 June 2026 and be replaced from 22 June 2026by updated tariff preference measures including Mexico and the Mexico Preferential tariff Quota.
This marks the practical entry into force of CPTPP provisions between the UK and Mexico, enabling eligible goods traded between the two countries to benefit from preferential tariff treatment where relevant requirements are met.

Overview of key developments

Mexico’s ratification enables CPTPP preferential treatment between the UK and Mexico. The key transition dates are:
Event
Date
Previous CPTPP tariff preference arrangement ends
21 June 2026
CPTPP tariff preferences with Mexico apply
22 June 2026
Under CPTPP, the UK gains access to the same tariff preferences that Mexico grant to other CPTPP members, subject to the relevant schedule and product-specific conditions. This provides improved market access and benefits beyond the earlier UK–Mexico bilateral trade arrangements in selected sectors, including dairy, chocolate and sugar confectionery, beef, pork, poultry, and lamb.

Main tariff and market access benefits

The implementation of CPTPP between the UK and Mexico provides:
  • Tariff reductions and eliminations
     across a wide range of goods.
  • Duty-free or reduced-duty tariff-rate quotas
     for selected sensitive products.
  • Improved market access
     for agriculture, food and drink, and industrial goods.
  • Greater supply-chain flexibility
    , including use of CPTPP rules of origin and cumulation where applicable.
  • Preferential access for eligible goods
    , subject to classification, origin documentation and quota availability.
UK exports to Mexico receive the same preferential tariffs as other CPTPP members, with enhanced benefits compared to the earlier UK–Mexico FTA:
  • Chocolate and sugar confectionery:
     UK exporters benefit from
    0% tariffs
     on exports of these products to Mexico.
  • Pork:
     MFN tariffs of up to
    20%
     are eliminated immediately upon the UK’s accession.
  • Beef:
     MFN tariffs of up to
    25%
     are eliminated, with most staging completed within four years.
  • Poultry:
     MFN tariffs of up to
    75%
     are eliminated within four years.
  • Lamb:
     MFN tariffs of
    10%
     are eliminated within two years.
  • Dairy:
     Additional opportunities are available for cheese, butter, cream and milk powder, including a
    6,500-tonne shared tariff-free cheese quota
    .
Duty Band
Typical Product Coverage
0% duty
Majority of tariff lines, especially raw materials, industrial inputs, chemicals, plastics and machinery components
Above 0% to 10%
Certain processed foods, minor agricultural goods and intermediate products
10% to 40%
Meat products, cereals and selected intermediate goods
Above 40%
Sensitive products, including certain dairy, poultry and sugar-related goods

Key trade benefits for Mexico

Practical considerations for traders
Preferential treatment is not automatic. Importers and exporters should confirm:
Issue
Practical point
Tariff classification
The correct tariff code must be used to identify the applicable preferential rate.
Origin
Goods must qualify as originating under CPTPP rules of origin.
Staging
Some reductions are immediate; others phase down over time.
Quotas
TRQ benefits depend on quota availability and administration.
Documentation
Traders should retain origin certification and supporting records.

Conclusion

The entry into force of the CPTPP between the UK and Mexico marks a significant milestone in strengthening bilateral trade relations. The agreement enhances market access, reduces tariffs, and introduces modern trade rules that support economic growth and supply chain integration.
These changes have been updated in
ONESOURCE Global Trade Content
. For further support on supply-chain risk, tariff management and regulatory compliance, customers may contact their Account Manager or Customer Success Manager.