Already paid; payment made in advance or payment that has been completed.
家賃は既払いなので、今月は大家に支払う必要はない。
The rent has already been paid, so there's no need to pay the landlord this month.
既払いの領収書を会計に提出してください。
Please submit the receipt for the payment that has already been made to accounting.
この料金は既払いとして処理されています。
This fee has been processed as already paid.