When does e-invoicing become mandatory in Slovakia?

B2B e-invoicing becomes mandatory from 1 January 2027. B2G (government invoicing) has been mandatory since January 2025.

What format does Slovak e-invoicing use?

Slovakia uses UBL 2.1 XML based on the EN 16931 European standard with the SK-CIUS national extension, delivered via the PEPPOL network.

Do I need a PEPPOL Access Point to send e-invoices in Slovakia?

Yes. Delivery must go through a certified Access Point (Digitálny Poštár / SAPI-SK participant). eFaktúra Centrum provides validation, viewing, error diagnosis and preparation tools — delivery is handled by your chosen Access Point.

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E-invoicing in Slovakia

Everything you need to understand, validate, and work with Slovak electronic invoices — PEPPOL network, EN 16931 standard, UBL 2.1 XML, error codes, and free tools.

Free PEPPOL Validator Browse Error Codes

E-invoicing Mandate in Slovakia

January 2022
Slovakia joins the PEPPOL network (SAPI-SK launched)
2023–2024
B2G e-invoicing piloted; state institutions begin receiving PEPPOL invoices
January 2025
B2G mandatory — invoices to public sector must be sent as UBL 2.1 XML via PEPPOL
2025–2026
B2B transition period: businesses prepare systems, connect Access Points, test workflows
1 January 2027
B2B mandatory — domestic VAT-payer to VAT-payer invoices must be XML. All taxable persons must be able to receive e-invoices.

Phase-in through 30 June 2030 applies to the sending obligation. The receiving obligation applies to all taxable persons from 1 January 2027.

Technical Stack

Layer	Standard / Protocol	Notes
XML format	UBL 2.1	Root element `<Invoice>` or `<CreditNote>`
Content rules	EN 16931	~160 BT fields, BR-xx business rules, mandatory elements
National extension	SK-CIUS	Slovak additions on top of EN 16931
PEPPOL profile	PEPPOL BIS Billing 3.0	R003–R100 routing and compliance rules
Transport network	SAPI-SK / PEPPOL	4-corner model via certified Access Points
Participant ID	0196:SK + IČO	e.g. `0196:SK12345678`

Tools & Guides

PEPPOL Validator

Upload your XML invoice and validate it against EN 16931, PEPPOL BIS 3.0, and SK-CIUS rules. Free, instant.

Error Code Database

41 validation error codes explained in English — BR-CO-10, R003, UBL-SR-01 and more. Causes and fixes.

What is PEPPOL?

How the 4-corner network works, Access Points, PEPPOL IDs, and why Slovakia chose this infrastructure.

PEPPOL ID for Slovakia

Format: 0196:SK + 8-digit IČO. How to find it, verify it, and register a PEPPOL endpoint.

E-invoicing Mandate 2027

Who must send e-invoices, who must receive them, timeline, and what to prepare before January 2027.

EN 16931 Standard

European e-invoice standard — BT fields, BR rules, UBL vs CII, and what Slovak SK-CIUS adds.

UBL 2.1 XML Schema

For developers: root element, required namespaces, mandatory elements, XML examples for Invoice and CreditNote.

Credit Notes (SK: Dobropis)

CreditNote XML structure, BillingReference to original invoice, positive amounts rule, step-by-step guide. (SK)

Frequently Asked Questions

When is e-invoicing mandatory for B2B in Slovakia?

From 1 January 2027 — all VAT-registered businesses must send domestic B2B invoices as XML via PEPPOL. The receiving obligation applies to all taxable persons (including sole traders and non-VAT-payers) from the same date.

I received an XML invoice from a Slovak supplier. What do I do with it?

Use the free PEPPOL Viewer/Validator to open and read the XML file in a human-readable format. You can then export it to PDF, forward it to your accountant, or import it into your ERP/accounting software. No special software is required just to read it.

Does a PDF invoice count as an e-invoice in Slovakia?

No. From 2027, a PDF or paper invoice will not fulfill the e-invoicing obligation for transactions covered by the mandate. The invoice must be in structured XML format (UBL 2.1) sent via a certified Access Point. A PDF attached alongside an XML may be used as a human-readable representation only.

What is eFaktúra Centrum? Are you a PEPPOL Access Point?

eFaktúra Centrum is a software intermediary and control layer — not a certified PEPPOL Access Point. We provide validation, XML viewing, error diagnosis, partner lookup, and preparation tools. Actual network delivery is handled by your chosen certified Access Point (Digitálny Poštár / SAPI-SK participant).

My invoice failed validation. Where do I start?

Go to the Error Code Database. Find the error code (e.g. BR-CO-10, R003, UBL-SR-01), read the cause and fix. For the five most common errors, each entry includes the XML field to correct and an example of the fixed structure.

Start with the free validator

Upload your XML invoice and get instant EN 16931 + PEPPOL BIS 3.0 validation. No account required.

Open Validator