In order to determine whether or not your goods qualify for North American Free Trade Agreement (NAFTA) tariff treatment, you should be aware of three contributing factors: 1. The Harmonized System classification number (HS code) 2. The Most-Favoured-Nation (MFN) tariff agreement 3. Chapter four of the NAFTA agreement This helpful resource offers more details on how the above elements help in determining NAFTA eligibility.