Mandatory e-Invoicing for B2B in Slovenia from January 1, 2028

In October 2025, Slovenia officially announced that from 1 January 2028, all domestic business-to-business (B2B) transactions will be subject to mandatory electronic invoicing (e-invoicing). According to the new law, both legal entities and sole proprietors registered in Slovenia will have to issue and receive e-invoices for B2B operations. Paper invoices will remain permitted only for B2C transactions and for B2B transactions with foreign companies.

This reform, aligned with the EU’s VAT in the Digital Age (ViDA) initiative, represents one of the biggest digital transitions in the Slovenian accounting and tax landscape.
For accounting firms and businesses — particularly those based in Ljubljana — this means a complete redesign of invoice issuance, validation, and archiving processes.

🔍 Key Takeaways:

Effective date: January 1, 2028 — early preparation is essential.
Scope: All Slovenian B2B entities will be required to issue and receive e-invoices.
Exceptions: Paper invoices remain valid only for B2C and cross-border B2B transactions.
Impact: Accounting systems must be upgraded to comply with e-invoicing standards (e.g., eSLOG 3.0, PEPPOL).
Benefits: Less paperwork, faster processing, fewer human errors, and stronger compliance.

🧮 Why it matters for your accounting:

For Slovenian businesses and accountants, mandatory e-invoicing means more than just a technical change — it’s a shift toward full automation, data transparency, and real-time tax reporting.
Companies that prepare early will avoid last-minute stress, reduce implementation costs, and ensure smooth compliance once the regulation comes into force.

At K2A Accounting Ljubljana, we assist clients in: