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Last updated at
January 27, 2026
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Book NowSlovenia’s Financial Administration (Finančna uprava Republike Slovenije, FURS), under the Value Added Tax Act (ZDDV-1) and public sector e-invoicing regulations, has implemented a national electronic invoicing framework to modernise tax compliance and public sector financial processes. The system currently makes structured e-invoicing mandatory for transactions with public sector entities, while a broader mandate for business-to-business transactions has been legally confirmed for future implementation.
The reform is a key part of Slovenia’s digital transformation agenda, requiring suppliers to public authorities to issue invoices electronically in a structured format through approved channels. In addition, Slovenia has adopted legislation that will extend mandatory structured e-invoicing to domestic B2B transactions from 1 January 2028.
E-invoicing in Slovenia is designed to improve transparency, reduce administrative burden, streamline payment cycles, and support accurate VAT reporting. This blog explains how the system works, who must comply, important timelines, technical rules, benefits, consequences of non-compliance, and how providers like Flick Network help businesses meet Slovenia’s e-invoicing requirements.
E-invoicing in Slovenia refers to issuing, transmitting, and storing invoices electronically in a structured data format instead of paper invoices or unstructured digital files. Since 2015, all invoices issued to public sector entities must be submitted electronically using approved systems and standardised formats such as e-SLOG, which aligns with the European e-invoicing standard EN 16931.
Each electronic invoice is generated by an approved accounting or invoicing system capable of producing structured data for automatic processing by the public sector recipient. Scanned paper invoices and basic PDF files do not qualify as valid electronic invoices for mandatory public sector transactions in Slovenia.
Once issued and transmitted in the required structured format; the electronic invoice serves as the legally valid record for accounting VAT reporting and audit purposes. The structured data format enables reliable validation; secure long term digital storage and full transaction traceability for businesses and public authorities across Slovenia.
The implementation of e-invoicing in Slovenia has followed a phased approach:
1 January 2015: Mandatory electronic invoicing introduced for all suppliers issuing invoices to public sector entities in Slovenia.
Ongoing: Use of structured formats such as e-SLOG maintained and aligned with EU standards for electronic invoicing.
1 January 2028: Mandatory structured e-invoicing for domestic B2B transactions in Slovenia comes into effect under adopted legislation.
The e-invoicing mandate in Slovenia applies to the following entities:
Businesses Issuing Public Sector Invoices: All domestic and foreign businesses issuing invoices to public sector bodies of Slovenia including ministries; municipalities; agencies and public institutions.
Public Sector Recipients: Public sector entities that are required to receive; process and archive electronic invoices in a structured format.
Future B2B Scope: From 1 January 2028 - all businesses issuing domestic B2B invoices in Slovenia will be required to issue invoices electronically in a structured format.
The key technical requirements and process elements include:
Invoice Format: Invoices must be issued in a structured electronic format such as e-SLOG in compliance with the e-invoicing standards of Slovenia and the European Union enabling automatic data extraction and processing.
Transmission Channels: E-invoices must be transmitted through approved national systems or through a certified service provider connected to public sector recipients.
System Requirements: A business must use accounting or invoicing software capable of the generation; transmission and digital archiving of structured electronic invoices.
Archiving and Record-Keeping: Electronic invoices must be stored in a secure digital archive that ensures the authenticity; integrity and readability of records for the legally required retention period.
Data Security: Systems must ensure - secure data transmission protection of data integrity and controlled access in line with the accounting and VAT regulations of Slovenia.
E-invoicing in Slovenia delivers significant advantages for businesses and public authorities:
Efficiency: Automated processing of invoices reduces manual work and the administrative effort of accounting teams across the daily operations of a business.
Accuracy: Use of structured data improves the accuracy of VAT calculation and financial reporting and reduces the risk of error in the reporting process.
Transparency: Digital records of transactions improve the level of traceability and strengthen audit readiness for both businesses and public authorities.
Cost Savings: Reduced dependence on the use of paper printing; mailing and physical storage leads to lower operational costs over the long term.
Faster Payments: Electronic invoices support quicker approval workflows and faster settlement of payments across accounting cycles.
Future Readiness: Early adoption prepares a business for the mandatory implementation of domestic B2B e-invoicing from 2028 and supports readiness for future regulatory changes in Slovenia.
Non-compliance with the e-invoicing requirements may result in several risks:
Invoice Rejection: Public sector entities may reject an invoice that is not issued in the required structured electronic format under the rules of Slovenia.
Payment Delays: A non-compliant invoice can delay the processing and the settlement of payments.
Compliance Exposure: Incorrect invoicing practices can increase the level of audit risk and regulatory scrutiny.
Operational Disruptions: Manual correction and resubmission of invoices can affect cash flow and the efficiency of internal workflows.
Businesses should take the following steps to prepare:
Assess Your Systems: Review the capability of the ERP billing or accounting software to support structured e-invoice formats such as e-SLOG and to meet the technical requirements of Slovenia.
Choose a Solution Provider: Select a compliant provider like Flick Network to manage the generation; transmission and digital archiving of electronic invoices in line with regulatory rules.
Integrate and Test: Connect internal systems to the e-invoicing solution; test invoice submission workflows; and confirm accurate data mapping with public sector recipients.
Train Staff: Train finance and accounting teams on the use of structured e-invoicing systems reporting processes and ongoing compliance obligations.
Flick Network provides a compliance focused invoicing platform designed for businesses operating across multiple jurisdictions. For Slovenia, Flick Network supports e-invoicing compliance by offering:
Structured Invoice Generation: Flick formats invoices in a compliant structured data format aligned with the legal and technical e-invoicing standards of Slovenia and the European Union.
Submission and Delivery Support: The platform enables secure invoice transmission through approved national channels; ensuring reliable delivery to public sector recipients.
Invoice Archiving and Tracking: All electronic invoices and transmission records are stored in a secure digital archive with full traceability for audit and reporting purposes.
ERP and Billing Integration: Flick Network integrates with existing ERP and billing systems - reducing manual processing effort and enabling consistent invoice workflows.
Continuous Compliance Support: The platform supports regulatory updates, format changes and onboarding assistance to ensure long term compliance with Slovenia’s evolving e-invoicing requirements.
Slovenia’s e-invoicing regime can be considered a very mature model of handling tax obligations through technology, since structured e-invoicing has been mandatory between the public and private sectors since 2015, and will expand to B2B mandates from January 1, 2028.
To achieve this, early preparedness on the part of businesses in terms of system readiness, software integration, employee training, as well as appropriate online archiving, can help streamline business operations, minimize chances of errors, as well as maintain complete compliance with Slovenian law. Solutions such as Flick Network can make this transition seamless by handling all aspects of structured bill creation, transmission, archiving, and compliance in order.
What is mandatory e-invoicing in Slovenia?
It is the legal requirement to issue structured electronic invoices for transactions with public sector entities in Slovenia, with mandatory B2B e-invoicing starting from 1 January 2028.
In Slovenia, who needs to adhere to rules on electronic invoices?
This is applicable to all companies that provide invoices to any Slovenian public authority, while all domestic invoices in the B2B market will be covered by the mandate from 2028.
Are scanned or PDF invoices accepted in Slovenia?
No. Scanned paper invoices or unstructured PDF files do not qualify as valid electronic invoices for mandatory e-invoicing in Slovenia.
Is e-invoicing mandatory for B2B transactions in Slovenia?
Currently it is voluntary, but mandatory structured e-invoicing for domestic B2B transactions will apply from 1 January 2028.
How long must e-invoices be stored in Slovenia?
Electronic invoices must be stored in a secure and accessible digital format for the legally required retention period under Slovenian accounting and VAT laws.
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