Shopify Duties and Import Taxes now supports preferential trade agreements in duties calculations.
Preferential treaties are applied using the shipping origin, shipping destination, products' country of origin, and products' harmonized system codes. When a preferential treaty is applied, buyers will see reduced duty rates in checkout.
For example, the United States-Mexico-Canada (USMCA) free trade agreement enables merchants to ship their products within North America with reduced import fees when they are manufactured in North America.
For more information on Shopify Duties and Import Taxes, please see the help center.