• 税金ぜいきん — tax / money paid to the government
• 消費税しょうひぜい — consumption tax
• 免税めんぜい — tax exemption
• 関税かんぜい — tariff
• 納税のうぜい — tax payment
• 増税ぞうぜい — tax increase
• 課税かぜい — taxation
• 減税げんぜい — tax reduction

This phono-semantic character pairs 禾 (grain/harvest) with 兌 (phonetic), suggesting revenue taken from production — i.e., taxes. In modern Japanese it anchors words across government, economics, and everyday finance.

税金ぜいきんを 払はらわなければなりません。
I have to pay taxes.

免税店めんぜいてんで 買かい物ものをしました。
I shopped at a duty-free store.