‘免税’ literally means ‘to exempt from tax’ — 免 (miǎn) means ‘to exempt’ or ‘to waive’, and 税 (shuì) means ‘tax’. Together, they form a noun meaning ‘tax exemption’, referring to the legal removal or reduction of tax liability on certain goods, services, income, or transactions. It is commonly used in commercial, financial, and governmental contexts.

You’ll often encounter 免税 in settings like international airports (e.g., duty-free shops), cross-border e-commerce platforms, or government policies supporting small businesses or specific industries. While it functions primarily as a noun (e.g., 享受免税政策), it can also act adjectivally before nouns (e.g., 免税商品 ‘duty-free goods’). Note that 免税 is not used alone as a verb — you’d say 免税政策 (tax-exemption policy), not *免税这个税.