As nouns the difference between invoice and bills
is that
invoice is a bill; a commercial document issued by a seller to a buyer indicating the products, quantities and agreed prices for products or services that the seller has already provided the buyer with an invoice indicates that, unless paid in advance, payment is due by the buyer to the seller, according to the agreed terms while
bills is .
As verbs the difference between invoice and bills
is that
invoice is to bill; to issue an invoice while
bills is (
bill).