E-invoicing in Slovakia

The Slovak model of e-invoicing, developed as part of the national eFaktúra system, will apply to domestic business-to-business (B2B) transactions and business-to-government (B2G) transactions. In the first phase, B2C and cross-border transactions will remain outside the scope.

For organizations with a complex SAP environment, adapting to eFaktúra should not be viewed solely as a technical change to the invoice format. It is a compliance project that affects sales, purchasing, finance, document workflows, and status monitoring processes.

Under the Slovak model, invoices will be exchanged through certified service providers. Structured invoices will be sent to the recipient via the Peppol network, and the required data will be simultaneously transmitted to the tax authorities.

This distinguishes the Slovak approach from the traditional clearance model, in which the administration approves an invoice before it is delivered to the recipient. In the C5 model, the tax authority does not block the document flow before the invoice is sent, but receives a defined set of reporting data.

Companies face the challenge of designing the process that covers both the sending and receipt of e-invoices and the accurate reporting of data to the tax authorities. Key areas will include data quality in SAP, invoice field mapping, document validation, handling of response messages, and status monitoring.

January 1, 2027, may seem far off, but preparing for e-invoicing in an SAP environment usually takes time. his is especially true for companies with multiple subsidiaries, different types of sales and purchasing processes, custom extensions, local invoice variants, or complex document workflows.

Preparations should include:

• analysis of the invoicing processes in SAP,
• identification of documents subject to the e-invoicing mandate,
• mapping data to the Peppol BIS Billing format,
• integration with a certified Peppol Access Point,
• processing of outgoing and incoming documents,
• data validation before transmission,
• monitoring of statuses and errors,
• integration with local e-reporting processes.

The sooner a company assesses the readiness of its SAP system, the easier it will be to minimize the risk of working under tight deadlines, data errors, and disruptions in invoice processing once the e-invoicing mandate takes effect.

For years, All for One has been helping companies adapt their SAP systems to local legal obligations and compliance requirements. A particularly important point of reference is our experience with Polish e-invoicing projects, especially in preparing companies for mandatory e-invoicing integrated with KSeF.

The All for One KSeF solution is already used by more than 120 companies integrating their SAP systems with the Polish National System of e-Invoices (KSeF). These projects have enabled us to build practical expertise in areas that are also key to international e-invoicing implementations: data mapping, document validation, handling large volumes of invoices, integration with external systems, and developing dashboards for business users.

We draw on this experience today in our international projects. All for One Poland is an accredited member of Peppol and provides a solution that supports the integration of SAP with the Peppol network and local B2B and B2G platforms.

Our solution is based on the All for One E-Invoicing integration layer and communication via a certified Peppol Access Point. This enables us to help companies prepare their SAP systems both for document exchange via Peppol and for local reporting requirements.

We support different SAP versions and architectural models, so the solution can be tailored to the customer’s current system landscape, whether in local organizations or international corporate groups.

Slovak eFaktúra is an example of a European trend in which electronic invoicing is becoming a mandatory element of compliance. For companies using SAP, the key challenge is to meet this legal requirement while maintaining continuity across sales, purchasing, and finance processes.

If your company operates in Slovakia and uses SAP, now is a good time to assess whether the system is ready for Peppol, structured XML invoices, and the reporting of invoice data to the tax authorities.

All for One will help you prepare your SAP system for e-invoicing in Slovakia in time, in line with the requirements and drawing on our experience from over 120 e-invoicing projects in Poland.