1. Overdue prepayments refer to the time limit for the prepayment agreed in the contract to be fulfilled.

2. Advance payment refers to the enterprise's purchase contract. Money paid in advance to the buyer.

3. Prepaid account refers to a creditor's right that the buyer and the seller agree to pay part of the payment to the supplier in advance. Prepaid accounts generally include prepaid payment for goods and prepaid purchase deposit. The prepayments of construction enterprises mainly include prepaid project funds and prepaid materials. Prepayment is the money paid to the supplier's customers in advance, and it is also an integral part of the company's creditor's rights.