While CUSMA is not yet ratified, it is expected that the tariff treatment codes for CUSMA will be:
• English: UST French: TEU – TT code 10
• Mexico: MXT French: TMX – TT code 11
Mexico-United States Tariff “(E) MUST (F) TMEU†(TT code 12) is repealed.
Please note that the abbreviation for the Mexico Tariff is changing from “MT†to “MXTâ€.
For goods that are released on or after the entry into force of the CUSMA, the Agreement will provide for two preferential tariffs only – either the United States Tariff (UST) or the Mexico Tariff (MXT) and will depend on the country of last production other than a minimal operation.
Minimal operations are described in  Chapter 2, National Treatment and Market Access, Annex 2-B, Tariff Schedule of Canada, page 2-B-3, beginning at paragraph 8.