The tax document contains all important data for the consumer.
The invoice for a product is essential at the time of purchase. After all, it is with her that the consumer can make an exchange or complain about the acquisition. It is in the tax document that all the data of the transaction carried out are contained.
Guarantee
The lack of this document may hinder future operations, such as the use of the product's warranty rules, in case of damage, in addition to possible exchanges, returns and refund requests.
This is a way of ensuring fiscal citizenship. It is a tax obligation and the consumer can demand its issuance.
Article 39, item VIII of the Consumer Protection Code and Law 8846, of January 21, 1994, which provides for the issuance of tax documents, considers the breach of legal or technical standards to be an abusive commercial practice. Failing to issue an invoice violates the law. In this way, we can say that the infraction of a tax nature is also considered an abusive commercial practice.
Obligation
There are consequences for the seller who denies the document. Law nº 8.137/90, in item V: "Denying or failing to provide an invoice or equivalent document related to the sale or provision of a service constitutes a crime against the tax order, with a penalty of imprisonment from two to five years and a fine" .
Thus, the consumer who does not receive the tax document can trigger the competent bodies to complain. It is possible to contact Procon or the Consumer Police Station. If there is no success, there is also the possibility of reporting the case to the Treasury Department of your state, which can also provide relevant information.
About the time to keep the receipt, the recommendation is that the consumer keep it, at least, until the end of the warranty period, but the ideal is to file it for the useful life of the product.