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KSeF Assistant: Deloitte's support in issuing e-invoices in KSeF

A professional solution to support issuing and receiving invoices in KSeF

From February 1, 2026, the National e-Invoicing System (KSeF) will become mandatory for all entrepreneurs in Poland. Proper preparation for this change requires not only adapting IT systems but also ensuring continuity and security of the invoicing process. Deloitte offers comprehensive support services for issuing and receiving e-invoices in KSeF, which help minimize operational risk and ensure compliance with tax requirements.

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KSeF solutions

Issuing invoices in a structured form using the National e-Invoicing System (KSeF) will become mandatory essentially from February 1, 2026. This is a fundamental change in the area of invoicing, requiring thorough preparations and certain solutions.

Proper implementation of KSeF is not only a technological issue but also a substantive and procedural one. In case of technical problems with their own systems, companies may face the risk of operational downtime and inability to issue invoices. 

Deloitte has prepared a specialized solution supporting companies in the process of issuing and receiving e-invoices - a comprehensive invoicing support service in KSeF.

Our solution – KseF Assistant

Deloitte offers comprehensive support in the field of issuing and receiving e-invoices in KSeF in two flexible variants:

Option 1: Full support

In this model, Deloitte provides comprehensive support in the process of issuing sales invoices and collecting purchase invoices on behalf of the client:

  • Issuing sales invoices
    • based on an agreed data format, Deloitte sends sales invoices to KSeF using its own IT tool
  • Purchase invoice retrieval
    • systematic retrieval of purchase invoices received by the customer via KSeF and delivery of them in the agreed format
  • Full feedback
    • providing the customer with information about the status of sent invoices and assigned KSeF numbers

The process is strictly defined with the client, who provides data for issuing invoices and receives complete information on the operations conducted.

Option 2: Security solution (backup)

This variant provides additional operational security for companies that implement their own solutions to support KSeF:

  • Readiness for action
    • Deloitte carries out all the necessary preparations (configuration, testing, process agreements)
  • Failure protection
    • in the event of malfunction or errors in the client's software, Deloitte can immediately take over the process
      of sending invoices to KSEF
  • Minimizing the risk of downtime
    • thanks to pre-prepared procedures, the reaction time in an emergency situation is minimal

This solution provides peace of mind and operational security, eliminating the risk of stopping invoicing processes in case of technical problems with the client's primary system.

How is the service implemented?

The implementation of KSeF support service by Deloitte proceeds in two key stages:

At this stage, we prepare all necessary system elements:

 

  1. Registration in KSeF
    • support in preparing and submitting the ZAW-FA form or obtaining a qualified electronic seal
  2. Creating a client profile
    • configuration of Deloitte systems for handling the client's invoicing processes
  3. Determining data formats
    • defining the scope and format of data necessary for sending sales invoices
  4. Developing procedures
    • agreeing on cooperation processes, including deadlines, approval process, and data delivery

The result of this stage is full system-readiness to start handling the client's structured invoices.

As part of ongoing cooperation, Deloitte provides:

  1. Generation of structured invoices
    • based on data provided by the client in the agreed format
  2. Transmission of invoices to KSeF
    • technical transmission of invoices to the ministerial system and monitoring status
  3. Retrieval of purchase invoices
    • systematic retrieval of invoices received by the client in KSeF
  4. Delivery of the documents
    • providing the client with retrieved invoices along with visualizations in the agreed form

All operations are carried out in accordance with agreed timeframes and procedures.

In addition to basic invoicing process support, Deloitte also offers additional supporting services:

  • Data mapping support
    • assistance in transforming data from the client's internal systems to the format required by KSeF
  • Support in corporate documentation
    • preparation of internal regulations regarding the use of a qualified electronic seal
  • Ongoing tax support
    • consultations on tax issues related to KSeF (helpline)

Why choose Deloitte support?

By choosing Deloitte as a partner in the invoice handling process in KSeF, you gain:

  • Expert experience
    • our VAT team consists of specialists with many years of experience in supporting VAT settlements
  • Technological competencies
    • the tax technology team includes programmers and system analysts with experience in designing solutions for structured invoices
  • Legal security
    • we have excellent knowledge of current and planned tax regulations
  • Impartiality and independence
    • we focus solely on delivering the best value to our clients
  • Flexible approach
    • our solutions are tailored to the individual needs of each client

Prepare your company for KSeF with Deloitte experts

Properly securing the invoicing process in KSeF is crucial for maintaining operational continuity and compliance with legal requirements. Our comprehensive support services will help you safely navigate the e-invoicing implementation process and ensure operational stability in the new conditions.

Contact us today to plan the implementation of KSeF support service for your company and adequately prepare for the upcoming changes in the e-invoicing area.

Sklep KSeF: kompleksowe wsparcie w procesie wdrożenia KSeF - rozwiązania na każdym etapie implementacji

Wdrożenie Krajowego Systemu e-Faktur (KSeF) to fundamentalna zmiana w obszarze polskiej księgowości, która od 1 lutego 2026 roku stanie się obowiązkowa dla większości firm. Niezależnie od etapu, na którym znajduje się Twoja organizacja w procesie wdrożenia KSeF, Deloitte oferuje kompleksowe wsparcie dostosowane do specyficznych wyzwań na każdym poziomie zaawansowania implementacji.

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Contact

Norbert Wasilewski

Norbert Wasilewski

Partner w zespole ds. Podatków Pośrednich
+48 (22) 5110825
Monika Wachowiec

Monika Wachowiec

Partner w zespole ds. Podatków Pośrednich
+48 61 882 42 31
Leszek Wiśniewski

Leszek Wiśniewski

Partner Associate w zespole ds. Podatków Pośrednich

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