The National e-Invoicing System (KSeF) is no longer a technological challenge assigned to IT or accounting teams, but a central component of a company’s financial architecture—regardless of its size. For Chief Financial Officers (CFOs), this marks a shift toward active change management that affects all sales, procurement, and reporting processes across the organisation.
At this final stage, KSeF is no longer a tax project. It has become a test of the organisation’s operational maturity and a measure of management’s ability to effectively govern risk and data.
Table of Contents:
- KSeF 2.0 and Accounting for Companies: What Does the FA(3) Structure Change?
- Data Consistency in KSeF: A New Standard for Accounting and Controlling
- KSeF in Corporate Accounting: Roles, Responsibility, and Data Auditability
- KSeF and Offline Mode: Ensuring Continuity of Accounting and Invoicing
- KSeF as an Area of Operational Risk
- The Final Testing Phase Before Full Operational Accountability
- Accounting as a Strategic Function from a CFO Perspective
- CFO Readiness Checklist for KSeF
KSeF 2.0 and Accounting for Companies: What Does the FA(3) Structure Change?
KSeF 2.0 introduces a new, mandatory logical structure for e-invoices — FA(3). This is not another test version or an alternative document format, but the target data model according to which invoices operate within the system. FA(3) standardises the way financial information is transmitted, placing emphasis on data quality and consistency.
Importantly, FA(3) is now functioning in real economic transactions. As a result, any inconsistencies between ERP systems, accounting processes, and the FA(3) structure may have a direct impact on invoicing processes and cash flows.
Data Consistency in KSeF: A New Standard for Accounting and Controlling
The implementation of KSeF and the new FA(3) invoice schema standardises the way invoice data is presented and interconnected. Information contained in the document header, details of the transaction parties, invoice line items, and tax settlements now form a single, coherent logical model that must remain internally consistent.
In practice, this marks a departure from the flexible interpretation of data that accounting teams have dealt with for years when working with PDF documents. KSeF removes the need for manual assumptions regarding the issuer’s intent and significantly reduces the risk of discrepancies between operational data and tax reporting.
KSeF in Corporate Accounting: Roles, Responsibility, and Data Auditability
Under the new KSeF operating model, access management is no longer a purely technical matter. It becomes an integral part of the internal control framework and corporate governance. Given KSeF’s extensive authorisation model, covering roles, tokens, and powers of attorney, the CFO must maintain full visibility over who issues, receives, and processes invoices, as well as how these actions are logged and made subject to audit within the system.
KSeF and Offline Mode: Ensuring Continuity of Accounting and Invoicing
FA(3), operating within the KSeF framework, requires formally defined and tested contingency procedures in the event of system unavailability in order to ensure continuity of invoicing.
KSeF as an Area of Operational Risk
As KSeF enters the production phase, responsibility shifts from an implementation project to the management board and senior leadership. Errors in data structures, a lack of consistent procedures, or unclear allocation of responsibilities may result not only in tax issues, but also in tangible disruptions to day-to-day operations.
For this reason, KSeF should be treated as a management-level initiative rather than a purely tax-driven project. It requires a comprehensive review of sales and procurement processes, closer integration between finance and operations, and the establishment of a stable data governance framework under the CFO’s responsibility.
The Final Testing Phase Before Full Operational Accountability
The tax authorities have indicated that, in the initial phase of KSeF operation, the priority is the adaptation of systems and processes rather than the immediate imposition of penalties for the late submission of offline invoices to KSeF. However, the absence of sanctions in this specific area does not imply flexibility or a postponement of responsibility.
Sanctions related to unreliable invoicing remain in force, in particular those arising from substantive data errors, incorrect tax settlement, or inconsistencies in information reported to the tax administration. KSeF does not eliminate liability—it merely changes the way in which compliance is verified.
The transitional period should therefore be treated as a time for intensive production testing, contingency simulations, and practical verification of whether the organisation is prepared to operate under a new, structured invoicing model.
For CFOs, this is a critical moment to assess whether financial and accounting systems, internal procedures, and operational teams are ready to function within the KSeF environment in a stable, repeatable, and fully tax-compliant manner.
Accounting as a Strategic Function from a CFO Perspective
For mature organisations, FA(3) becomes a catalyst for genuine financial transformation, including:
- the unification of data across systems,
- the automation of accounting processes,
- improved quality of reporting and controlling,
- enhanced operational resilience of the organisation.
Viewed in this way, KSeF is not merely a cost of compliance, but a foundation for modern financial management.
Summary
At this final stage, KSeF leaves no room for half measures or temporary solutions. What matters most is not the technical aspect itself, but the organisation’s readiness and maturity to operate within a new data model. FA(3) becomes the operational standard, and responsibility for its proper functioning shifts to the management level. In this context, the CFO assumes the role of guarantor of data quality, process continuity, and the organisation’s financial stability.
CFO Readiness Checklist for KSeF
| Area | Key Actions | Readiness Criteria |
| Data | Mapping 100% of transaction scenarios to the FA(3) structure | Sample-based invoice audit completed and validated |
| IT | Integration with KSeF and production testing in the operational environment | Stable system logs, low and repeatable error rate |
| People | Team training completed; roles and responsibilities clearly assigned | Teams ready for day-to-day operations without manual workarounds |
| Risk | Offline procedures defined; continuity tests for invoicing and reporting | Documented and successfully executed contingency simulation |
