efsta EFR API solutions for B2B and B2G
Since the e-invoicing functionality is part of systems with different architectures, it is implemented in the existing EFR middleware, which can be operated locally by machine (e.g. POS system), on-site with multiple clients, centrally (ERP) or as a service in the cloud. The EFR is embedded in the efsta ecosystem to enable secure data processing and transmission, long-term archiving and system administration via the efsta cloud portal.
The use of fiscalization and e-invoicing modules is not mutually exclusive. For example, an invoice fiscalised according to the law can be used in parallel on a POS system; the common tool for monitoring is the efsta portal.
From January 1, 2025, the basic obligation to use e-invoices will come into force in Germany. In order to facilitate the transition for companies, flexible transitional arrangements are planned until 2027.
Issuing invoices:
Until the end of 2026, companies may continue to issue paper invoices for B2B sales instead of e-invoices. Electronic invoices that do not comply with the new format are permitted, but only with the recipient's consent.
Until the end of 2027, companies with a previous year's turnover of up to EUR 800,000 may continue to use paper invoices or other electronic formats.
Receiving invoices:
From 1 January 2025, all companies are obliged to be able to receive and process e-invoices. The transitional regulations only apply to issuing invoices, not receiving them.
Do you have questions about our solution in Germany? Arrange a consultation appointment.
In Italy, electronic B2B invoicing via the SDI system (Sistema di Interscambio) has been mandatory since 2019. This procedure ensures that invoices are issued, transmitted and received in a structured data format, which enables automatic and electronic processing in accordance with Italian regulations.
All information about our solution in Italy can be found here.
Do you have questions about our solution in Italy? Arrange a consultation appointment.
From February 1, 2026, Poland will introduce mandatory B2B e-invoicing for all domestic transactions.
Issuing invoices:
Since 2022, Polish companies have been able to use the Krajowy System e-Faktur (KSeF) on a voluntary basis. From February 1, 2026, all invoices between companies subject to VAT must be issued and transmitted via the KSeF platform in a prescribed XML format.
Companies are obliged to ensure a seamless connection to the KSeF API, validate invoice data and convert it into the prescribed XML format. In addition, the invoice status must be tracked in real time and archiving must be ensured in accordance with Polish regulations.
You can find more information in our blog article on the e-invoicing solution in Poland.
Do you have questions about our solution in Poland? Arrange a consultation appointment.
