s value, determined by itsHarmonized System (HS) codeand country of origin. If you s location. Each US state or country has theirsales taxor international VAT. Customs authorities assess the shipment Home / Shipping & Fulfillment / How to Handle FedEx Duty Payments: A Guide for Canadian ECommerce Merchants October 6, 2026 . 9 min A surprise FedEx duty payment is one of the fastest ways to lose a customer. This guide explains how FedEx duty payments work in Canada and how to pay for them.