Electronic invoicing is reshaping the rules of business. What should companies expect in the years ahead?
Slovakia is entering a new era of invoicing. From 1 January 2027, mandatory e-invoicing will be introduced for selected domestic transactions, gradually replacing traditional paper and PDF invoices. The aim of this reform is to speed up processes, enable full automation of invoice processing, and strengthen VAT control and transparency.
For businesses, this means invoices must be issued in a structured electronic format compliant with the European standard EN 16931, allowing full machine readability and automated processing across systems. Standard PDF invoices will no longer be considered valid e-invoices. From 2030, e-invoicing is expected to become the default invoicing standard across the EU. Only structured EN 16931-compliant formats will be accepted, while PDF will cease to be recognised as an e-invoice. In some EU Member States, hybrid formats (XML + PDF) may still be permitted, provided they contain a structured data layer compliant with EU standards (this will not apply in Slovakia).
The government is also introducing a certified delivery mechanism via the European Peppol network, an international infrastructure designed for secure and standardised electronic invoice exchange. Peppol is emerging as one of the key enablers of cross-border e-invoicing between businesses and the public sector. A list of certified service providers compliant with EU delivery standards is published by the Financial Administration of the Slovak Republic.
A further major shift is expected from July 2030, when the current control statement and summary statement obligations are expected to be abolished and replaced by continuous, real-time transactional reporting directly from electronic invoices. This represents a structural shift from periodic reporting towards fully automated, data-driven compliance.
All transaction data will be transmitted to the Financial Administration of the Slovak Republic almost instantly. The invoice issuance deadline will be reduced to 10 days, and the notification deadline to 5 days. Failure to comply with reporting obligations may result in penalties of up to EUR 10,000, and up to EUR 100,000 in case of repeated non-compliance.
Key practical risks and implementation challenges
Automated systems will reject invoices that fail to meet strict technical and logical validation rules, including:
- Rounding discrepancies: Even minor inconsistencies in net calculations or incorrect discount application may lead to automatic rejection.
- Missing matching data: Absence of key references such as the Buyer Reference can cause failure in automated recipient processing workflows.
- Faulty data conversion: Basic PDF-to-XML conversion tools often lead to incorrect data mapping, such as missing quantity or pricing fields.
2026 will therefore represent a critical preparation phase for businesses, requiring a thorough review of ERP systems, internal processes, integrations, and the readiness of trading partners.
If you would like to assess your company’s readiness or discuss implementation impacts in more detail, please feel free to contact us for a professional consultation.