Slovakia Updates E-Invoicing Guidance: What Businesses Must Know Before January 2027

Slovakia’s Financial Administration has updated its eInvoicing FAQ and certified-provider list ahead of the January 1, 2027 mandate. New explanations cover invoice issuance, failed Peppol delivery, VAT deduction and self-billing. Businesses should test their delivery and accounting processes now.

Slovakia’s Financial Administration has refreshed its eFaktúra guidance as businesses prepare for mandatory domestic electronic invoicing from January 1, 2027. The official frequently asked questions (FAQ), dated October 12, 2026, explain invoice issuance, unsuccessful delivery, self-billing and VAT coding. A separate certified-provider register dated October 16 lists 80 providers, while the authority’s Peppol validation rules were updated on October 14.

These are administrative and technical updates, not new legal deadlines. The underlying framework remains the VAT Act No. 222/2004, as amended by Act No. 385/2025. VAT-registered suppliers will generally have to issue structured electronic invoices for transactions covered by the domestic mandate, while relevant business recipients must be able to receive them through a certified delivery service. The rules primarily concern business-to-business and business-to-government invoices, rather than ordinary consumer sales.

The authority clarifies that creating an electronic invoice in an accounting system does not, by itself, complete the issuance process. For invoices delivered through the certified service, the relevant issuance date is the date on which the invoice is handed to that service for delivery. The date stated on the invoice should correspond to the actual sending date.

The ordinary 15-day invoicing deadline is preserved where applicable. Businesses should therefore check when their software transfers a document from a draft or approved state to the delivery provider, not merely when an employee selects “create invoice.”

An eInvoice must also be a structured electronic document, compatible with the applicable European standard and Peppol BIS requirements. A PDF or existing EDIFACT message is not automatically a compliant eInvoice. The official guidance explains that businesses using EDIFACT may retain their source process if they convert the invoice data into a compliant structured format.

One recurring question concerns a supplier that sends an invoice but receives a delivery error because the customer has not registered to receive documents through Peppol. The FAQ explains that a supplier which correctly sends the compliant invoice through the prescribed certified delivery service may have fulfilled its sending obligation even when delivery fails because the recipient is not registered.

The authority also addresses subsequent delivery of that same document by email. It distinguishes sharing an existing compliant invoice from issuing a second invoice and discusses recipient consent when an electronic invoice is sent by another channel. Businesses should therefore avoid generating duplicate invoice numbers simply to overcome a delivery failure.

Importantly, unsuccessful Peppol delivery does not automatically extinguish the customer’s right to deduct input VAT. If the customer subsequently has a compliant invoice, the deduction must still be assessed under the ordinary substantive requirements of Slovak VAT law. This is not an unconditional right to deduct without supporting documentation. It also does not excuse recipients from arranging their required receiving capability by January 1, 2027.

For self-billing, where a customer issues an invoice in the supplier’s name and on its behalf, the October FAQ distinguishes the reporting timing from normal supplier-issued invoices. It identifies a five-day reporting period for such arrangements, calculated from the invoice issue date or expiry of the applicable issue deadline. Providers and retailers using self-billing should verify who is responsible for the document and related data flow. 

The FAQ also supplies Slovakia-specific mapping for Peppol VAT Category Codes and VATEX exemption reasons. The correct category depends on the legal VAT treatment of the transaction, not simply on the VAT amount displayed. A zero VAT amount, for example, does not automatically justify category Z: exemptions, reverse charges and other treatments have distinct categories. Software suppliers should test these mappings against the official guidance and the October 14 validation-rule update.

For retailers, the main operational consequence arises when a point-of-sale (POS) transaction produces an invoice for a business customer. A conventional eKasa Fiscal Receipt and an eInvoice should not be treated as interchangeable documents; whether an electronic invoice is needed depends on the underlying transaction and applicable invoice rules.

Retail chains should examine the connection between POS, invoicing and enterprise resource planning systems, particularly where receipts, invoices, corrections and self-billing may originate in different applications. Receiving workflows matter as much as outgoing sales: each relevant entity needs access to its chosen certified delivery service, even if it issues few invoices.

The October 16 official register lists 80 certified providers, compared with the smaller counts reported earlier in the year. This indicates a growing provider market, but registration on the authority’s list does not establish that a particular retailer’s integration has been tested or configured correctly.

From our perspective, the hardest part is likely to be documenting the distinction between a valid invoice, successful technical delivery and VAT deduction. Confusing these stages could produce duplicate documents, missed deadlines or incorrect VAT treatment even when the underlying accounting entry is correct.

What should affected businesses prepare now?

Businesses should verify their provider’s current certification status, confirm support for the structured invoice format, and test sending, reception, failed delivery, corrections and VAT-code validation before January 2027. Those using self-billing should agree the reporting workflow with their partners and technology providers.

Government Bill No. 1454 separately proposes removing buyer-side invoice reporting and granting temporary penalty relief for certain supplier-side failures until June 30, 2027. The proposal remains unenacted and must not be treated as a postponement of the January receiving obligation.

The principal official references are the Financial Administration’s October 12 eFaktúra FAQ, its October 16 register of certified delivery providers and its official eFaktúra information page. The legislative proposal can be followed through the Slovak Parliament’s record for Bill No. 1454.

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Mirko Bijeljanin, Junior Legal Consultant at Fiscal Solutions

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