Frequently Asked Questions About eFaktúra and Digital Postman
Find answers to frequently asked questions about electronic invoicing, the Flowis Digital Mailbox, and the Peppol network. Find out how sending and receiving e-invoices works, how the system integrates with your accounting software, how data security is ensured, and how to prepare your business for e-invoicing.
Frequently Asked Questions
What is an e-invoice, and how does it differ from a PDF?
An electronic invoice is a structured document in XML format compliant with the European standard EN 16931 (UBL 2.1) and sent in accordance with the BIS 3 standard (a set of rules and security measures). A standard PDF sent via email is not an electronic invoice because, in addition to standards and a uniform format, it contains data that must be manually transcribed for further processing.
How will electronic invoices be sent to customers?
Through so-called “Digital Mail Carriers” (Service Providers, or DP for short), who ensure secure transmission over the international Peppol network
Who is required to have a digital mail carrier starting January 1, 2027?
Anyone who issues a domestic invoice and is a VAT payer must have a digital mail provider to send electronic invoices, and every domestic business must have a digital mail provider to receive invoices (unless you are absolutely certain that you will not receive an invoice from any VAT payer.)
Does e-invoicing also apply to end users (consumers)?
No. Mandatory e-invoicing applies only to invoicing between businesses (B2B) and between businesses and the government (B2G). It does not apply to end consumers (B2C).
Can I have more than one digital mailer?
For sending electronic invoices, yes, even more than that. But for receiving invoices, only one
Can I use Flowis for received e-invoices and a different email client for sent ones?
Yes. You can use Flowis for incoming invoices, even if you process outgoing invoices through a different email provider.
Who is the Flowis Digital Mail Carrier best suited for?
The Flowis digital mail service is suitable for sole proprietors, small and large businesses, accounting firms, and the public and nonprofit sectors. Companies and invoicing and accounting systems can integrate it via API.
What else does the Flowis Digital Mailbox offer besides receiving and sending e-invoices?
Digital Postman offers conversion of invoices to the BIS 3 format, an overview of their status and history, and access for accountants. By integrating with the Flowis system, you can automate the entire process for incoming invoices—from receipt through approval to posting in the accounting system.
Are there any exceptions where e-invoices cannot be used?
Yes, for example, classified contracts or deliveries to security agencies, where paper invoices or other methods are used
Will the control and summary report be eliminated?
Yes, but not until July 1, 2030. The data will be reported automatically through the e-invoice system.
How can an e-invoice be canceled after it has been sent?
Indirectly—errors are resolved through credit memos, corrections, and resending the corrected document
What types of documents will the e-invoice system support?
Invoices, self-billing invoices, and credit memos
Can I use older formats, such as EDIFACT?
Yes, but for VAT purposes after January 1, 2027, they must be converted into XML e-invoices in accordance with the EN 16931 standard.
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