What is the DANFE and what is it for? Is there only a DANFE for the NF-e? Where can I issue it? This topic has raised a lot of questions for our readers. So we've put together a detailed study on it. Let's take a look?

The DANFE is an auxiliary document to the Electronic Invoice and the Electronic Consumer Invoice. It's the printed, graphic representation of a purchase record.
The form also carries a QR code. It lets you look up that invoice online, more easily, since NF-e and NFC-e information only lives in the cloud.
That said, there are times you need to verify a purchase's authenticity without internet access.
By reproducing a summary of an NF-e or NFC-e's sale data, the DANFE certifies that product's legitimacy. This matters a lot — for example, if a home-delivery product is sold in São Paulo and gets stopped in transit to Belo Horizonte without it, the business can be fined and warned for the violation.
The document has specific issuance and printing rules that can be found at the state Treasury Department. All rules must be followed strictly to prove the transaction's authenticity.

Note: Loose sheets, continuous forms, or pre-printed forms may be used.
In contingency situations, use a security form to print the Auxiliary Document of the Electronic Tax Document (FS-DA).
Created in 1994 by the Japanese company Denso-Wave, the QR code is a two-dimensional barcode. That gives it quick-response capability — it can be read faster than a regular barcode.
Alongside the DANFE, it makes it easier for consumers to look up electronic tax document data using apps installed on smartphones and tablets. All without any extra cost — there are countless free apps with this scanning feature.

This document must be printed by the invoice's issuer at the time of an in-person sale. This happens when requested by the consumer, in place of or in addition to sending an electronic message with the access code for lookup, or sending the invoice file.

Yes, it can be printed on any paper. But we recommend using paper that keeps the information legible over a long period (at least 6 months).
For printing the DANFE, it's advisable to use paper with a minimum width of 58 mm and side margins of at least 0.2 mm. However, there's no restriction against printing the DANFE NFC-e on other paper sizes, such as A4.
To print the DANFE, the taxpayer must use non-fiscal printers — thermal, inkjet, or laser — that keep the QR code legible.
You can keep your invoice, but remember: this tax document is electronic, so it stays stored in the cloud for 5 years (the tax statute-of-limitations period).
The Auxiliary Document of the Electronic Invoice and the Electronic Consumer Invoice aims to support the adaptation to this new system, alongside the technological changes happening today.
And in this piece, we tried to cover the most important points of its procedures. We hope we've answered all our readers' questions. But if you still have doubts, feel free to send us a message!