Import taxes are the gatekeepers of international trade, and understanding how they are calculated is essential for any business buying goods from overseas. The global standard follows a layered approach: first, customs duty is assessed on the CIF value (the sum of the product cost, insurance, and freight to the destination port). Then VAT or goods and services tax (GST) is calculated not just on the CIF value, but on CIF plus the duty already charged — a tax-on-tax structure that amplifies the final cost. For example, a $10,000 shipment with $500 in freight and $50 in insurance has a CIF of $10,550. At a 10% duty rate, duty is $1,055, bringing the taxable base for VAT to $11,605. At 20% VAT, you owe $2,321 in VAT alone. Total import taxes: $3,376, or nearly 34% of the original product cost. Duty rates are determined by the Harmonized System (HS) code assigned to each product, and they vary by country of origin due to trade agreements, preferential tariffs, and anti-dumping duties. Knowing your exact tax liability before shipping prevents cash flow surprises and enables accurate landed cost pricing.