Introduction

The electronic invoice, as the printed invoice, is a document that helps us to prove all the acquisitions of goods and services that an entity performs with another committing to make a payment, the obligation of a good or service and by its nature, guarantees that the information therein is protected, since it is not manipulated once it is issued and it has the same validity as hardcopy invoices.

With this new process, the businesses may:

•	Reduce time in clarifications, having more for pursuing business opportunities
•	Detect faster the difference in received amounts.
•	Detect faster the difference in received amounts.
•	Save paper and storage space.

Digital Tax Proof

The Mexican Tax Administration System (SAT) defines a digital tax proof as the fiscal proving mechanism that is incorporated into existing traditional schemes. It is based on the use of information technology for generating sending, and saving fiscal documents under the provisions set forth and enforced by SAT.

The different types of tax proofs that can be electronically exchanged are listed below:

•	Rental receipt
•	Fees receipt
•	Comprobante de pago a plazos
•	Trade invoice
•	Credit note
•	Debit note
•	Auto invoice
•	Bill of Freight

Features of the Digital Tax Proof:

a)	Integrity: Guarantees that the information included in the message is protected and that it cannot be manipulated or modified, thus confirming the non-alteration of the original data.
b)	Authenticity: Verifies the identity of the issuer and receiver of the Digital Tax Proof.
c)	No rejection: Once the Digital Tax Proof has been stamped by the issuer, he/she will not be able to deny the generation thereof.
d)	Confidentiality: Only the persons issuing and receiving the invoices can read the message.

SAT

Electronic invoice benefits: increase in the vendor client productivity, lower administrative and office costs, and reduction on manufacturing and restocking time. .