Slovakia is joining project e-Invoice! This initiative focuses on adapting suppliers to electronic invoicing

Project e-Invoice – a new way of invoicing

Slovakia is joining project e-Invoice! This initiative focuses on adapting suppliers to electronic invoicing, which will be implemented according to the pan-European Peppol network (Pan-European Public Procurement On-Line).

Starting from 1.1.2027, a legislative change will require every entrepreneur to issue and receive invoices exclusively in electronic form through the e-Invoice system. However, businesses and companies don’t have to wait until year 2027, the new e-invoice system will be made available from the second quarter of 2026.

With this step, Slovakia will join a proven European model, that is already being used in more than 20 EU countries.

Benefits for Businesses:

Faster automation of invoice processing
Better integration with accounting systems
Reliable delivery and fewer errors
Cost reduction – up to 80% of costs related to invoice processing
Easy search of all invoices in one place
Faster payment of issued invoices
More eco-friendly and sustainable solution

Adaptation of the new e-Invoice system has begun

Representatives of the largest software, accounting, and technology companies have already started implementing e-Invoice into their platforms in cooperation with the Financial Administration. Currently, the software is being prepared for the Peppol Ready phase, which ensures full technical readiness for secure electronic invoice exchange in a unified European format.

At the same time, expert negotiations and training sessions have been held with companies such as Slovak Telekom, SPP, ZSE Energia, Slovenská pošta, Orange…, to ensure a smooth transition to the new system.

What does this mean for Entrepreneurs?

Electronic invoicing will save you both time and costs. Thanks to the process automation, the new system will also simplify your accounting, as you will no longer need to manually re-enter data—everything will be uploaded automatically. At the same time, you will have better control over receivables and expenses, as all invoices will be stored in one place.

What do you need to ensure before e-Invoice goes live?

Before the start of implemention of the new system, you need to take a few simple steps.

First you’ll need to contact the software provider of your economics software. They need to verify whether the software you use for business and accounting is ready to create and receive e-invoices in the Peppol BIS format. Alternatively, check if the software developers are aware of this change and have started preparing the system for the new invoicing process.

Then you need to choose your Peppol network access provider. You’ll have to decide whether you want to use an intermediary or direct access through an accredited service provider.

After you’re done with the previous steps, ie. your software is ready to create and receive e-invoices and you have chosen your access provider, you’ll need to test everything carefully to see if everything works as you need. Check if you can send and receive invoices before you start the e-invoice system.

If everything works as it should, you can launch the system and start enjoying the benefits of e-invoicing.

How Does It Work?

The Peppol system is a European network that enables electronic exchange of business documents between companies. It supports invoices, credit notes, orders, catalogs, and responses. The one that you will use, Peppol BIS, focuses mainly on invoices and credit notes.

Document transmission works through access points that ensure secure delivery. The process looks like this:

Sender → Sender’s Access Point → Recipient’s Access Point → Recipient

Don’t forget to register, before you start using it! The steps are as follows:

Register with an access point provider
Obtain a Peppol ID (a unique business identifier in the Peppol network)
Create documents in the Peppol BIS format (UBL (Universal Business Languag) – xml format)

Peppol enforces strict rules for date formats (YYYY-MM-DD), supports negative invoices, standard codes (380 for invoices, 381 for credit notes), and payment details. If documents do not comply with Peppol rules, the system will reject them as invalid and will not upload them.

The e-invoice itself must be uploaded in xml format, but you can attach additional files such as PDF, text files, or CSV.