Frequently asked questions about e-invoicing

An e-invoice is not a PDF. It is a structured XML document in UBL 2.1 format, delivered through the international Peppol network. Unlike a traditional paper or PDF invoice, an e-invoice contains machine-readable data that enables automatic processing without manual re-entry.

An e-invoice contains all the elements of a regular invoice — supplier, buyer, line items, VAT, due date — but in a standardized format that any compatible invoicing system can process.

Peppol (Pan-European Public Procurement On-Line) is an international network for exchanging electronic documents between businesses and public institutions. It works similarly to email — each participant has their own address (Peppol ID) and documents are delivered through certified intermediaries.

Peppol is already mandatory in many EU countries including Belgium, Italy and the Nordic countries. Slovakia will join from 2027. The network ensures secure and standardized exchange of invoices between any two participants regardless of the software they use.

Digitálny poštár je certifikovaný sprostredkovateľ (Peppol Access Point), ktorý zabezpečuje odosielanie a prijímanie e-faktúr cez sieť Peppol. Funguje ako váš "poštový úrad" pre elektronické faktúry.

Without a digital postman you cannot send or receive e-invoices. Fakturuj.si also functions as your digital postman — you don't need to deal with any external provider. The service is included in the price of €2 per month.

"5. roh" (alebo "5-corner model") je mechanizmus automatického hlásenia dát z e-faktúr Finančnej správe SR. Pri každej e-faktúre odoslanej cez sieť Peppol sa kópia údajov automaticky posiela aj štátnej správe.

Thanks to this model, the need to file VAT control statements will gradually disappear (expected abolition date is 2030), as the Financial Administration will have all data in real time. For entrepreneurs, this means less administration.

E-invoicing becomes mandatory from 1 January 2027 for domestic B2B and B2G transactions of VAT payers in Slovakia. This means that if you are a VAT payer invoicing another Slovak company or government institution, you must issue and send the invoice as an e-invoice via the Peppol network.

For cross-border transactions, e-invoicing is not yet mandatory, but an extension is expected in the coming years under the EU's ViDA (VAT in the Digital Age) initiative.

It depends on whether you are a VAT payer. If you are a VAT payer (voluntary or mandatory), from 1 January 2027 you must issue e-invoices for domestic B2B transactions. If you are not a VAT payer, the obligation to issue e-invoices does not yet apply to you.

However, non-VAT payers must also be able to receive e-invoices from 1 January 2027, as their suppliers (VAT payers) will be sending invoices in electronic format.

Yes, from 1 January 2027 you must be able to receive e-invoices regardless of whether you are a VAT payer or not. Your suppliers who are VAT payers will send invoices exclusively in electronic format via the Peppol network.

That is why it is important to have a digital postman and an invoicing system that can receive and display e-invoices. Fakturuj.si handles this automatically — received e-invoices appear directly in your account.

The Financial Administration of the Slovak Republic can impose a fine for non-compliance with e-invoicing obligations. The amount depends on the severity of the violation and can reach thousands of euros. Exact sanctions will be specified in the VAT Act amendment.

In addition to financial penalties, there is also a risk of non-recognition of VAT deduction if the invoice was not issued in the required electronic format. Therefore, it is important to prepare for e-invoicing in time.

After 1 January 2027, PDF will not be accepted for B2B transactions between VAT payers in Slovakia. A PDF invoice will not meet legal requirements and will not be recognized as a valid tax document for VAT purposes.

You will be able to continue sending PDF invoices only in cases where e-invoicing is not mandatory — for example, for invoices abroad or for non-VAT payers (until the obligation is extended). Fakturuj.si will also automatically generate a PDF version for your internal needs.

The e-invoice is in UBL 2.1 (Universal Business Language) format, which is an international XML standard for business documents. This format is mandatory for the Peppol network and is supported in all EU countries.

The XML file contains structured data — identification of supplier and buyer, invoice line items, VAT rates, amounts, date of issue and due date, and other required elements. Regular users do not work with this file directly — the invoicing system generates and processes it automatically.

You send an e-invoice through a digital postman (Peppol Access Point). In practice, this means you issue an invoice in your invoicing system as usual and the system automatically sends it in the correct format via the Peppol network to the buyer.

In Fakturuj.si, this process is fully automatic — you issue an invoice, click send, and the system takes care of converting it to UBL 2.1 format, validation, and delivery via Peppol. You don't need to understand XML or technical details.

Your digital postman automatically receives e-invoices from suppliers and delivers them to your invoicing system. You don't need to download or manually import anything — received invoices appear in your account automatically.

In Fakturuj.si, received e-invoices are displayed in the received invoices section with a complete overview — supplier, amount, VAT, line items, due date. You can approve, export, or pass them to your accountant.

Yes, you will need to register on the Financial Administration of the Slovak Republic portal for e-invoicing. In addition, you need a digital postman (Peppol Access Point) through which you will send and receive e-invoices.

If you use Fakturuj.si, we will handle most of the registration process for you. We will help you register on the Financial Administration portal and automatically register you in the Peppol network with your own Peppol ID.

Peppol ID je jedinečný identifikátor vašej firmy v sieti Peppol. Funguje ako "adresa" pre prijímanie e-faktúr — podobne ako e-mailová adresa, ale pre elektronické faktúry. Na Slovensku sa ako Peppol ID zvyčajne používa IČO firmy s príslušným prefixom.

Every company that wants to send or receive e-invoices via Peppol must have a Peppol ID assigned. In Fakturuj.si, we will assign you a Peppol ID automatically when activating e-invoicing.

E-invoicing via Fakturuj.si costs €2 per month excl. VAT. Everything is included — unlimited sent and received e-invoices, digital postman (Peppol Access Point), Peppol network registration, and technical support.

No hidden fees, no surcharges for the number of invoices. One fixed price for a complete e-invoicing solution. Plus, the first 30 days are free.

If you already use Fakturuj.si, you don't need to change anything. E-invoicing will be enabled automatically and you can continue working just as before — only your invoices will also be sent via the Peppol network.

If you use a different invoicing system, check with your provider whether it will support e-invoicing via Peppol. If not, switching to Fakturuj.si is simple and can be done in a few minutes.

Yes, Fakturuj.si supports both — sending and receiving e-invoices via the Peppol network. Sending works automatically when you issue an invoice. Received e-invoices are automatically displayed in your account in the received invoices section.

A complete solution in one system — you don't need separate software for receiving and sending. Everything is integrated in Fakturuj.si for one price.