還付|かんぷkanpu[1]atamadaka (head-high)

1. noun, suru verb, transitive verbreturn; restoration; refund; (duty) drawback

• Synonym返還へんかんWrittenWritten word for returning territory or things to their owner, as in 「沖縄返還」; 「還付」 is mostly officials refunding tax or fees.
• Synonym払い戻しはらいもどしNeutralNeutral word for refunds of things like tickets or insurance; common in daily life, while 「還付」 is money such as tax or fees returned by the authorities.
• Synonym返却へんきゃくNeutralNeutral word for returning borrowed items, e.g. library books; the object is a thing, not tax money, unlike 「還付」.
• Synonym返金へんきんNeutralEveryday neutral word for giving money back in any setting, not only tax; 「還付」 is an authority handing back money or goods it overcollected or had held.
• Synonym払い戻すはらいもどすNeutralEveryday verb for paying money back, as with a ticket refund; 「還付」 is the noun for an authority handing back money or property it overcollected or had borrowed.
• Synonym返すかえすNeutralThe most common everyday verb for returning something, with objects of any kind, not just money.
• Related課税かぜいWrittenWritten word for imposing a tax obligation; not a direct antonym, since 「還付」 refunds tax rather than levying it.
• Related返済へんさいNeutralNeutral word for repaying borrowed money or things, e.g. 「ローンの返済」; 「還付」 is the authorities returning money they overcollected.
• Related償還しょうかんWrittenWritten financial/legal term for repaying loans or redeeming bonds at maturity; 「還付」 is officials refunding overcollected money.
• Related弁済べんさいWrittenWritten legal term for discharging a debt, e.g. 「債務の弁済」, focused on settling what you owe; 「還付」 is an official refund.
• Related戻しもどしNeutralNeutral word for returning or giving something back; mostly seen in compounds like 「払い戻し」 and rarely used on its own.
• Related返送へんそうNeutralNeutral word for sending something back to the sender, typically mail or parcels; it names the act of shipping it back, whereas 「還付」 is an official refund.
• Related返上へんじょうNeutralNeutral word for voluntarily giving something back or giving it up, as in 「汚名返上」; not about official refunds.
• Related割り戻すわりもどすNeutralNeutral verb for returning part of a payment as a rebate, mostly in business deals; 「還付」 is tax money returned by the authorities.
• Antonym徴収ちょうしゅうWrittenWritten word for collecting taxes and fees — the opposite side of 「還付」, which returns money collected in excess.
• Antonym返納へんのうWrittenWritten word for handing things back to the authorities, such as a licence in 「免許返納」; unlike 「還付」, the return goes to officials, not from them.

Use 「還付」 for the authorities refunding tax or fees collected in excess, as in 「還付金」. For everyday refunds say 「払い戻し」 or 「返金」; for returning borrowed items 「返却」; for repaying loans 「返済」. 「返還」 is for giving things or territory back, 「返納」 for handing documents to officials, 「償還」 and 「弁済」 are financial/legal repayment terms, and the opposite of 「還付」 is 「徴収」; 「課税」 is not a direct opposite.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 官公庁かんこうちょうなどが借かりていたり、多おおく徴収ちょうしゅうした金品きんぴん等とうを本人ほんにんに返還へんかんするために交付こうふすること。