Mandatory B2B e-invoicing 2028: Prepare in time
As of January 1, 2028, mandatory e-invoice exchange in Slovenia will also apply to B2B transactions .
In larger organisations, it is important to check in good time how ERP and back-office systems, financial processes, business rules, and domestic and international customers and suppliers will be included in e-exchange. bizBox helps you plan, connect and implement the transition with less manual work and more control.
Key questions for larger companies
- Which ERP, accounting, and document management systems will be included?
- How are invoices issued and received today, and where are manual steps still involved?
- How will domestic and international customers and suppliers be included in the exchange?
- Which formats, standards and exchange channels will need to be supported?
- How will exceptions, rejections, and mismatched documents be handled?
- Who will be responsible for implementation, support, and process oversight?
What do you gain by starting preparations now?
For larger companies, implementing mandatory B2B e-invoicing is not just a technical connection. It affects systems, processes, departments, business rules, and collaboration with customers and suppliers. Starting early means less improvisation right before the deadline, fewer manual workarounds, and greater reliability in day-to-day document exchange.
No temporary manual workarounds
Instead of quick temporary fixes, you can check in good time how incoming and outgoing invoices are handled, where manual steps occur, and what needs to be adjusted.
Gradual onboarding of partners
You can segment, notify, test and onboard suppliers and customers into the exchange without unnecessary pressure right before go-live.
Less pressure on internal teams
Finance, accounting, IT, procurement and sales have more time to align responsibilities, data, systems and supporting processes.
Exceptions become a manageable part of the process
Errors, rejections, missing data and mismatched documents become an expected part of the process, not a daily operational disruption.
Discuss preparing for e-invoices
When preparing for mandatory B2B e-invoicing, it is useful to check early on what the change will mean for your company in practice. In a brief consultation, we can review together which systems, processes, and business partners will be involved, where challenges may arise, and which first steps make the most sense.
Anja Adlešič
E-exchange consultant, bizBox
ZZI d.o.o.
What does a well-planned implementation mean?
A well-planned implementation of mandatory B2B e-invoices does not begin with the selection of a technical solution, but with a clear understanding of existing processes.
A company must first know how incoming and outgoing invoices flow today, which systems are involved, who participates in the process, where manual steps occur, and how discrepancies are handled. Only then is it possible to determine the most sensible way to implement e-exchange.
RECOMMENDED IMPLEMENTATION STEPS
01
Review of existing processes
Analyze how today the issuance and receipt of invoices take place, where manual steps steps and which parts of the process are critical for uninterrupted operations.
02
Identification of involved systems
Check which ERP, accounting, document management, archival, or other back-end systems will be involved in e-invoice exchange and how they are interconnected.
03
Review of business partners
Determine which customers and suppliers will be included in the e-exchange, which exchange methods they use today, and whether they will require additional support during the transition. For larger companies, it is also important to review partners that use different systems, standards, or have international requirements. bizBox enables different partners, systems, and environments to remain connected through a single entry point, using e-SLOG 2.0 and other established standards.
04
Definition of formats, standards, and channels
Under ZIERDED, e-invoices must be exchanged in accordance with the e-SLOG 2.0 standard (or another internationally recognised standard by prior agreement), and the exchange must take place via registered e-route providers from the UJP list. Check which formats and channels you use today, especially when doing business with foreign partners.
05
Integration planning
Determine how the e-exchange solution will be connected to existing systems and processes so it does not create additional work, parallel paths, or unnecessary data duplication.
06
Testing and gradual rollout
Before full implementation, verify key scenarios, document flows, partner exchange, error handling, and process operation in practice.
07
Operational support after implementation
After implementation, provide support for users, business partners, process changes, and any new requirements that arise during daily e-exchange.
How does bizBox help?
bizBox helps companies implement mandatory B2B e-exchange as a structured, connected, and manageable process. The solution enables secure, reliable, and automated exchange of e-invoices and other business documents through a single point of entry. It is designed for companies that want to integrate e-exchange into existing systems and processes, rather than create additional manual work, parallel workflows, or separate solutions for different partners.
Integration with existing systems
bizBox connects to the company’s ERP, accounting, document management, and other back-end systems, enabling e-exchange without unnecessary duplication of work.
Customer and supplier onboarding Implementation is not only about the technical connection, but also about gradually onboarding partners into the e-exchange process.
Reducing operational workload
The goal of implementation is less manual work, fewer errors, fewer delays, and greater visibility into exchanged documents.
Support for multiple standards and formats
The solution enables exchange with various partners, systems, and environments, even when they use different technical requirements.
Automated e-invoice exchange
The company can exchange e-invoices directly from its existing way of working, with fewer manual steps and better process traceability.
Schedule a consultation on e-invoicing preparation
Is your company ready for mandatory B2B e-exchange?
Timely preparation is especially important for companies with a more complex business environment: multiple systems, multiple departments, a larger number of partners, or a higher volume of documents. This approach is suitable if:
- You use ERP, accounting, document management, or archiving systems.
- You exchange large volumes of invoices and other business documents.
- You want to reduce manual work in finance and accounting processes.
- You need reliable, traceable, and secure document exchange.
- You want to onboard partners on time and without unnecessary pressure.
- You want to transition to mandatory B2B e-invoices before the deadline.
If you recognize yourself in these challenges, now is the right time to check how you can prepare for the rollout.
bizBox is used by more than 18,500 Slovenian companies, including larger organizations in demanding industries.
Frequently asked questions
Does this page explain the legal changes?
This page is not intended as a detailed legal interpretation of the legislation, but rather as a practical guide for larger companies preparing for mandatory B2B e-invoice exchange. It explains what the change means for systems, processes, business partners, and day-to-day document exchange.
For a more precise definition of the law, see: https://www.bizbox.eu/e-racuni/zakon-o-e-racunih/
Do we really need to start preparing now?
Yes — primarily because the transition to e-exchange is not only a technical change, but also an organizational one. Companies that start on time have enough time for:
- reviewing existing processes,
- alignment with accounting and ERP/DMS solutions,
- testing exchange with partners,
- gradual implementation without pressure or delays.
Many companies wait until the last minute, which usually results in higher costs, more improvisation, and more operational issues. With bizBox, you can implement the transition gradually and without major changes to your business operations. Furthermore, the solution is already connected to more than 68 ERP and accounting systems.
Is it just about connecting to the ERP system?
No. An ERP connection is only one part of the story. bizBox provides a complete ecosystem for electronic business:
- issuing and receiving e-invoices,
- EDI document exchange,
- connecting with customers, suppliers, public administration, and banks,
- automation of business processes,
- secure and legally compliant e-archiving of documents.
Companies can use bizBox directly via the web application or connect it to their existing ERP system — depending on their needs and level of digitalization.
What if our customers or suppliers use different systems?
This is one of the main advantages of the bizBox network. Your partners can use different ERP systems, standards, or exchange methods, while bizBox ensures connectivity and conversions between systems. It is not necessary for everyone to use the same solution or service.
bizBox supports various EDI standards and communication channels (AS2, AS4, SFTP, OFTP2, API connections, etc.) and enables connection with other networks both domestically and abroad.
In practice, this means:
- less manual work,
- fewer transcription errors,
- faster document processing,
- easier collaboration with partners of various sizes.
Can bizBox also support international e-exchange?
Yes. bizBox supports domestic and international e-exchange, as well as connectivity with various European and international networks and international providers. The solution enables the exchange of e-documents in compliance with EU standards and legislation, making it suitable for companies doing business with foreign partners or groups of companies in different countries.
Through bizBox, companies can:
- exchange e-invoices with foreign countries,
- exchange orders, delivery notes, and other EDI documents,
- conduct business with international partners without additional complex integrations.
What do we get from a brief consultation?
During a brief consultation, we will jointly review your current document exchange processes, identify which workflows can be digitized most rapidly, and explore the connectivity options available for your ERP or accounting system, DMS, or other back-end business solutions. We will also discuss the implementation of e-invoices and EDI exchange, regulatory compliance requirements, and the most logical approach for your company.
The objective of this consultation is not a sales meeting, but rather to provide you with a clear overview in a short amount of time regarding your actual requirements, the scope of work involved, and how to implement these changes gradually, in an organized manner, and without unnecessary complications.
Many companies discover that they can begin implementation much faster and more easily than they initially expected.