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Hire us Starting Feb 2026, KSeF e-invoicing is mandatory for businesses with a turnover >200M PLN, and for all VAT payers from Apr 2026. Our team at Innowise provides end-to-end KSeF integration with your processes so that you remain compliant.
Starting Feb 2026, KSeF e-invoicing is mandatory for businesses with a turnover >200M PLN, and for all VAT payers from Apr 2026. Our team at Innowise provides end-to-end KSeF integration with your processes so that you remain compliant.
Integrating with KSeF is a strict legal mandate enforced by the Polish Ministry of Finance and ignoring these regulations will completely immobilize your daily business operations.
We take care of all technical steps for linking your infrastructure with the Ministries of Finance servers. All of our engineers are skilled in working with complex data maps, creating endpoint configurations and developing secure API gateways.
The solution creates valid FA(3) XML documents based on your ERP data and validates required fields against the official KSeF schema before submitting structured invoices to the Ministry of Finance platform.
We put a process in place to transfer the incoming and outgoing invoices via KSeF, generate the XML structure, then automate the whole process within your ERP or accounting system without human help.
We monitor all endpoints of your KSeF integration, and if the Ministry of Finance makes changes to the KSeF API specifications or FA(3) schema, we will upgrade your integration points and mapping layers to ensure you can continue processing live invoices.
We create a KSeF connector that plugs into your existing accounting software and won’t require you to replace old-hat infrastructure with something new. Whether your stack is enterprise-grade or entirely custom-built, we adapt to it.
One platform for process management
Pre-submission invoice validation
Flexible integration with ERP
Intuitive logic and fast roll-out
Permanent updates and maintenance
Let our experts prepare your business before the deadline.
We run every KSeF implementation as a structured project with defined checkpoints and keep disruption to your current billing and accounting workflows as low as possible.
We audit all existing ERP architecture and invoice data structures to identify the scope of the KSeF integration and the requirements for the FA(3) mapping.
We produce a functional spec that will detail the API authentication, FA(3) mapping, error handling, and the architecture of the KSeF connector.
We configure and build the KSeF integration and perform full end-to-end testing to ensure that all components operate properly in the KSeF Sandbox environment, as well as confirm FA(3) compliance before any production go-live takes place.
We will conduct relevant training sessions for your finance and accounting team, and will execute a monitored go-live to immediately catch any issues that arise after the integration has been deployed to production.
As tax regulations continue to change in Poland, we will provide ongoing support, API update deployments, and FA(3) schema compliance checks to keep your KSeF integration up to date.
Having an office in Poland and high-ranking tech talent to make up the top 5% in their field means that we know how to design an architecture for KSeF, according to the Polish tax law. We can assemble KSeF integration teams within 1–2 weeks, which is critical when your 2026 deadline is approaching.
KSeF is the most consequential mandatory compliance project Polish businesses have faced in years, and the integration work goes far deeper than most teams expect. We’ve built our entire implementation methodology around one principle: your invoicing must work correctly on go-live day, because in a live tax environment, there is no acceptable failure margin.
Over the years, Innowise has consistently proven to be a long-term, reliable partner. The consistency and quality of the services provided have significantly contributed to the success of our joint initiatives.
Innowise is able to implement new features faster than the internal team would be able to. Their communication is effective and solution-oriented. Overall, the speed with which they deliver quality code is wonderful.
Innowise’s work met all expectations. The team was efficient, prompt, and on top of their project deliverables. Customers can expect an experienced team that offers an array of business services.
KSeF (Krajowy System e-Faktur) is Poland’s national e-invoicing system that will be used by all VAT payers beginning in 2026. The KSeF is managed by the Ministry of Finance, and any invoices created after the deadline will not have legal validity, and the person who issued them will be subject to financial penalties.
Yes, we create KSeF connectors for SAP, MS Dynamics 365, Odoo, custom ERP systems, and accounting workflows based on Excel. Our middleware approach adapts to your existing infrastructure and does not require replacing or rebuilding any part of it. Therefore, no additional expense would be needed to connect KSeF to your existing system.
Yes, our KSeF integrations can completely automate the FA(3) invoice creation process, including batching and submitting invoices, as well as incoming invoice polling. Thereby, requiring no manual processes during any of these three steps. Our enterprise-grade integration architecture is designed to scale to enterprise-level invoice throughput, while allowing for real-time processing across multiple legal entities.
We provide token-based authentication through the official KSeF API, along with certificate management and encrypted key storage during every stage of the integration process. All data in transit is encrypted, and access to all endpoints of KSeF is controlled based on your authorization level according to your company’s internal security policies.
The timeline for integration varies based on the architectural requirements of your ERP, as well as the complexity of your data and the number of legal entities being integrated. Integrations that are straightforward can go live within a few weeks' time, while integrations requiring a higher degree of complexity (e.g., enterprise-level solutions) generally take between 2 and 4 months to complete. Since KSeF integration will be a mandatory requirement after the year 2026, starting your system audit now is the most practical first step.
