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An invoice, bill or tab is a commercial document issued by a seller to a buyer, relating to a sale transaction and indicating the products, quantities, and agreed prices for products or services the seller had provided the buyer.

Payment terms are usually stated on the invoice. These may specify that the buyer has a maximum number of days in which to pay and is sometimes offered a discount if paid before the due date. The buyer could have already paid for the products or services listed on the invoice.

In the rental industry, an invoice must include a specific reference to the duration of the time being billed. So in addition to quantity, price, and discount, the invoice amount is also based on duration. Generally, each line of a rental invoice will refer to the actual hours, days, weeks, months, etc., being billed.

From the point of view of a seller, an invoice is a sales invoice. From the point of view of a buyer, an invoice is a purchase invoice. The document indicates the buyer and seller, but the term invoice indicates money is owed or owing.

A typical invoice may contain:

In countries where wire transfer is the preferred method of settling debts, the printed bill will contain the bank account number of the creditor and usually a reference code to be passed along the transaction identifying the payer.

The US Defense Logistics Agency requires an employer identification number on invoices.

The European Union requires a VAT (value added tax) identification number.

In Canada, the registration number for GST purposes must be furnished for all supplies over $30 made by a registered supplier in order to claim input tax credits.

Recommendations about invoices used in international trade are also provided by the UNECE Committee on Trade, which involves a more detailed description of the logistics aspect of merchandise and therefore may be convenient for international logistics and customs procedures.


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