Invoice (rēķins)

An invoice (rēķins) is the document a seller uses to request payment for goods supplied or services rendered, and in the books it is an external source document. A VAT payer's invoice that meets the VAT Law requirements is a tax invoice (nodokļa rēķins).

The Accounting Law treats an invoice as a source document that a business issues to the buyer of goods or services for payment. It must show at least the document name, date, number, the identity of both parties and a description of the transaction with its value in money. A VAT payer adds the details required by Section 125 of the VAT Law, such as both VAT numbers, the rate applied and the amount of VAT.

A registered VAT payer issues the tax invoice no later than the 15th day after the supply or after receiving an advance payment. A signature is not required if another external document with legal force, such as a contract, proves the transaction, or if the invoice goes to a private individual under an agreement with them.

Invoices to public budget institutions must already be structured e-invoices. From 1 January 2028 the same applies to every invoice a business issues to another company registered in Latvia.