rebate money; refund
A sum of money returned to a payer, typically as a discount or reimbursement in business or tax contexts.
Depending on the contract terms, a rebate may be issued.
I received a tax refund through my final tax return.
Compound of 割り戻し (わりもどし, 'rebate, discount') + 金 (きん, 'money'). The exact historical derivation is uncertain, but it follows a common pattern for financial terms.