noun
additional tariff; surtax
Refers to an extra customs duty imposed on top of the regular tariff, often in trade disputes or protective measures.
政府は輸入車に追加関税を課すことを検討している。
The government is considering imposing an additional tariff on imported cars.
関税 is the general term for customs duty or tariff, while 追加関税 specifically means an extra or supplementary tariff.
Compound of 追加 (ついか, 'addition') and 関税 (かんぜい, 'tariff').