Finance. The interest difference of the bid bond shall be paid to the finance. Bid bond is a certain amount of deposit paid by the bidder to the tenderer when bidding, which is used to ensure that the bidder can fulfill his contractual obligations and complete the project construction after winning the bid. Interest on bid bond refers to the interest earned by the bidder after depositing the bid bond in the bank, which is the property income of the bidder. Therefore, the interest difference of the bid bond belongs to the bidder's property income, which should be declared and paid by the bidder to the finance.