How to choose a slovak digital postman for e-invoice delivery and what to focus on when making your selection

Starting in January 2027, Slovak companies will use certified digital postmen to receive and send electronic invoices. Choosing one is therefore one of the first concrete steps to take before mandatory e-invoicing begins. The differences between providers go beyond just price. They vary in how they handle documents, the scope of their support, their experience, and how well their solution adapts to existing company processes.

A company chooses a digital postman from a list of certified providers on the Financial Administration portal. However, the actual way of working with e-invoices can vary significantly depending on the type of company.

For smaller companies or sole traders, a simple digital postman application will often suffice. Once the service is activated, they can receive invoices and, depending on their obligations, issue and send them as well. There is no need to implement a new accounting system or deal with complex technical connections. For larger companies, on the other hand, it usually makes sense to integrate e-invoicing into the environment where invoices are already created and processed. This could be an ERP, an accounting system, EDI communication, or several different source systems. In such cases, it is important to maintain existing approval and accounting procedures as well as the automation the company already relies on.

Look beyond just invoice delivery when choosing

A digital postman will handle the transfer of invoices between companies and the communication related to mandatory e-invoicing. When choosing one, it makes sense to also look at what happens to a document before it is sent and after it is received.

For a simple solution, it may be important how clear the application interface is and how the provider handles archiving. The obligation to store invoices remains with the supplier and the customer, and a digital postman is not automatically required by law to provide archiving. Companies should therefore verify whether archiving is part of the service, how long documents are stored, and in what format they can be retrieved later. For larger companies, the decision-making process also involves ERP integration, the return of status information, or routing invoices to the correct system or process.

Security is a significant criterion. Business and financial data will pass through the digital postman, and from October 1, 2027, requirements for operators of Peppol network access points will become stricter. They will be required to meet ISO/IEC 27001 certification or a recognized equivalent. It is therefore worth checking now whether a provider is prepared for this change. GRiT has long met these certification requirements.

It is also good to know in advance how the solution handles errors and outages. An invoice may fail validation, contain incorrect data, or a technical issue may occur during transmission. A company should be able to easily check the status of a specific document, receive information about an error, and know who to contact to resolve it. For larger volumes of invoices, it is also important whether status information and errors are automatically returned to the system that employees use daily.

When deciding, it is also worth looking at the provider's experience with electronic document exchange and e-invoicing abroad. Slovakia is not the first country to introduce mandatory electronic invoicing, and experience from other European markets can help with preparing integrations, setting up document processing, and the transition to the new regime itself. GRiT brings years of experience with electronic data interchange, enterprise system integration, and international e-invoicing to the Slovak e-invoicing landscape.

Don't leave choosing your digital postman until December

Medium and larger companies should start preparing as soon as possible. They need enough time not only to select a provider but also to verify system integrations, data flows, and how e-invoices will tie into their existing billing and accounting processes.

Smaller companies and sole traders don't have to wait until the end of the year either. They can choose their digital postman early, explore the application environment, and verify how issuing and receiving electronic invoices will work. This way, they will have this new requirement sorted out before the January launch and won't be scrambling to find a provider at the last minute.

Want to see what working with electronic invoices looks like first? Check out our free e-invoicing demo from GRiT.