What Should Businesses 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 reform aims to accelerate business processes, enable automated document processing and strengthen VAT oversight.
For businesses, this means invoices will need to be issued in a structured electronic format compliant with the European standard EN 16931, a format that information systems can process automatically. A standard PDF will no longer qualify as a valid e-invoice. From 2030, e-invoicing will become the default invoicing method across the EU. Only structured formats compliant with EN 16931 will be accepted, and PDFs will no longer be recognised as e-invoices. Some EU Member States will permit hybrid formats (XML + PDF), provided the structured component complies with the EU standard; Slovakia, however, will not.
In parallel, the state is introducing certified delivery services via Peppol, an international network for the secure exchange of electronic invoices. Peppol is emerging as one of the leading solutions for e-invoice delivery in both B2B and public-sector transactions. The Financial Administration of the Slovak Republic publishes on its website a list of certified service providers that operate in line with the EU delivery standard.
A further fundamental change is expected from July 2030, when the VAT control statement and the EC Sales List are set to be abolished and replaced by near real-time reporting of data drawn directly from e-invoices. The compliance burden will thus shift from periodic filings to automated digital reporting.
All data will be reported to the Financial Administration almost instantly. The deadline for issuing an invoice will be shortened to 10 days, and businesses will have 5 days to meet their reporting obligations. Late or inaccurate reporting may result in penalties of up to EUR 10,000, rising to EUR 100,000 for repeated breaches.
Key Risks and Practical Pitfalls
Automated systems will reject any invoice that fails to meet strict technical and validation rules:
- Rounding discrepancies: Inaccurate net line-item calculations or incorrectly applied discounts will trigger immediate rejection.
- Missing matching data: An omitted Buyer Reference will cause automated processing to fail on the customer’s side.
- Unreliable data conversion: Basic PDF-to-XML converters frequently produce incorrect mapping, such as empty fields with no quantity or price.
2026 therefore represents an ideal window for businesses to prepare by reviewing their ERP systems, processes and integrations, and assessing the readiness of their trading partners.