Customs Duty Calculation: MFN vs FTA Rates Explained with Examples
Updated 26 September 2026: the worked examples now use current EU, UK and Oman tariff rates, and the explanations of MFN rates, proof of origin and India's levies have been corrected. Understanding the difference between MFN (Most Favoured Nation) tariff rates and FTA (Free Trade Agreement) preferential rates is fundamental to maximizing your trade profitability. The duty savings from leveraging an FTA can range from a few percentage points to complete elimination, translating into thousands or even millions of dollars saved annually. This guide explains the concepts and walks through real-world calculation examples. What Is the MFN Tariff Rate? The Most Favoured Nation (MFN) rate is the standard customs duty rate that a WTO member country applies to imports from all other WTO members. Under the WTO's core principle of non-discrimination, a country must apply the same tariff rate to imports from all other WTO members — unless a preferential arrangement (like an FTA) exists. Key characteristics of MFN rates: Applied uniformly to all WTO member countries For most products, each country's WTO schedule of concessions sets a bound rate : a ceiling agreed in trade rounds The applied MFN rate, the one charged at the border, can be lower than the bound rate but not higher Countries change their applied rates themselves, through budgets and customs notifications What Is the FTA Preferential Rate? An FTA preferential rate is a reduced or zero customs duty rate that applies only…
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