A refund — money returned when an overpayment (often taxes) has been made.
確定申告の後、数週間で還付金が口座に振り込まれた。
After the tax return, the refund was transferred to my account within a few weeks.
医療費の払い戻しで還付金を申請した。
I applied for a refund for medical expense reimbursements.
輸入消費税の還付金の手続きを始めた。
I started the procedure for a refund of import consumption tax.