Poland KSeF Providers: Software, Intermediaries & API Integrators for 2026

Poland's KSeF (Krajowy System e-Faktur) is fundamentally different from France or Germany: every invoice goes directly through the government platform. There is no intermediary routing network like Italy's SDI or France's PDP ecosystem. KSeF is the one and only clearing house for all Polish domestic B2B VAT invoices.

What this means for businesses is that the "provider" question is really a software question: which accounting system, ERP, or API integration tool will you use to connect your business to the KSeF API?

How KSeF Connectivity Works

Before looking at providers, understand the connectivity model:

Your invoicing/ERP software generates a FA_VAT XML invoice (the structured format required by KSeF)
Your software sends the XML to the KSeF API at ksef.mf.gov.pl using your NIP (tax ID) and a cryptographic token
KSeF validates the XML against the FA_VAT schema and business rules
If valid, KSeF assigns a unique KSeF reference number (numer referencyjny) and timestamps the invoice
Your software retrieves the reference number and stores it alongside the invoice
Your buyer retrieves the invoice from KSeF using the reference number

There are two connectivity methods:

Direct API integration: Your software calls the KSeF API directly — best for businesses generating >50 invoices/month
Web portal (e-Urząd): Manual upload via the KSeF portal at efaktura.gov.pl — suitable only for very low volumes

Category 1: Dedicated Polish ERP and Accounting Software

These are the platforms built from the ground up for the Polish market and have native KSeF modules.

Comarch ERP Optima

Poland's most widely deployed ERP system with over 80,000 business customers. Comarch achieved KSeF certification early and has been running live production KSeF integrations since the voluntary phase in 2021.

KSeF support: Native FA_VAT generation and direct KSeF API submission
FA_VAT version: FA(2) — current required schema
Features: Real-time submission, automatic reference number retrieval, KSeF status dashboard, offline mode for KSeF outages
Best for: SMEs to mid-market businesses needing a comprehensive Polish ERP
Pricing: From PLN 149/month
Website: comarch.pl/erp

InsERT nexo

InsERT is one of Poland's oldest software companies (founded 1991) with a strong reputation for reliable, well-documented Polish tax compliance. InsERT nexo is their modern cloud/hybrid product.

KSeF support: Native, with an offline mode for KSeF downtime (a real concern in Poland — the 2024 postponement was partly due to infrastructure reliability)
FA_VAT version: FA(2)
Features: JPK_VAT integration, ZUS/PIT compliance modules, clean modern UI
Best for: Freelancers and small businesses wanting a clean interface with full Polish tax compliance
Pricing: From PLN 89/month
Website: insert.com.pl

enova365

A modular ERP platform popular with mid-market Polish businesses, available in both cloud and on-premise deployments.

KSeF support: Native FA_VAT plus Peppol access point for cross-border
FA_VAT version: FA(2)
Features: REST API for custom integrations, modular pricing (pay only for what you use), regular schema updates
Best for: Mid-market businesses that need modularity and a developer-friendly API
Pricing: From PLN 199/month
Website: enova365.pl

Symfonia

Symfonia is one of the oldest Polish accounting software brands, well-known among Polish accountants (księgowi) and tax advisors. Their KSeF module has been part of the Symfonia ERP suite since the voluntary phase.

KSeF support: Native integration with KSeF API
Features: Full Polish accounting and tax compliance, strong accountant ecosystem
Best for: Businesses whose accountant already uses Symfonia; widely supported by Polish biura rachunkowe (accounting offices)
Website: symfonia.pl

Wapro ERP (Asseco WAPRO)

Wapro is a long-established Polish ERP from Asseco group — one of Central Europe's largest IT companies.

KSeF support: Native KSeF module with FA_VAT 2.0
Features: Deep Polish retail and wholesale integration, full accounting suite, widely deployed in Polish retail
Best for: Polish retail and wholesale businesses needing tight POS and invoicing integration
Website: wapro.pl

Category 2: International ERP Systems with KSeF Modules

Large international ERP platforms have added KSeF compliance modules for their Polish customers.

SAP (S/4HANA and SAP Business One)

SAP released an official KSeF integration add-on for S/4HANA customers in 2025. SAP Business One also supports KSeF via certified Polish localisation partners.

Best for: Large enterprises already on SAP
Note: Requires implementation partner support; not a self-service module
Website: sap.com

Microsoft Dynamics 365

Microsoft added native KSeF support to the Polish localisation of Dynamics 365 Finance in 2025, following the security audit-driven delay. The Polish localisation is maintained by Microsoft's Gdańsk development centre.

Best for: Businesses already using Microsoft Dynamics 365
Website: microsoft.com/dynamics365

Category 3: API Integration Platforms

For businesses with custom-built invoicing systems or ERP platforms without native KSeF support, API integration platforms provide a middleware layer.

Taxdown / KSeF Middleware (Various Vendors)

Several Polish IT companies offer KSeF middleware — essentially a service that accepts invoices in various formats and handles the KSeF API communication on your behalf. This is an option for developers who want to connect legacy systems without rebuilding them.

Key considerations when evaluating middleware:

Authentication handling: Secure management of your KSeF token
Retry logic: What happens when KSeF is temporarily unavailable?
Error reporting: Clear notifications when KSeF rejects an invoice and why
Audit log: Full log of every submission and KSeF response for future tax audits

The KSeF e-Urząd Portal (Ministerstwo Finansów)

For businesses with very low invoice volumes, the Ministry of Finance's own portal at efaktura.gov.pl provides a free manual upload interface. You can create or upload FA_VAT invoices directly.

Cost: Free
Limitation: Manual process; no API; not scalable beyond a few invoices per month
Best for: Micro-businesses or testing before API integration

What to Look for When Choosing a KSeF Provider

1. FA_VAT version support

The current required schema is FA(2) (formally FA_VAT version 2.0). Ensure your software supports this — older software versions may only support FA(1), which is no longer accepted.

2. Offline mode for KSeF downtime

KSeF has had infrastructure issues in the past (the 2024 postponement was partly related to this). Check if your software has an offline mode: the ability to queue invoices locally when KSeF is temporarily unavailable and auto-submit when it recovers. This is especially important for businesses that cannot afford to stop invoicing during outages.

3. KSeF token management

Your KSeF token is a cryptographic credential that authorises your software to submit invoices. Losing or exposing this token is a serious security risk. Ask your provider how they secure and manage KSeF tokens.

4. JPK_VAT integration

Most Polish businesses also need to submit JPK_VAT (the standard audit file for tax reporting). Software that handles both KSeF invoicing and JPK_VAT reporting together reduces complexity significantly.

Summary

Provider	Type	Size	Native KSeF	Offline Mode
Comarch ERP Optima	Polish ERP	SME–Mid	✅ FA(2)	✅
InsERT nexo	Polish ERP	Freelancer–SME	✅ FA(2)	✅
enova365	Polish ERP	SME–Enterprise	✅ FA(2)	✅
Symfonia	Polish ERP	SME–Mid	✅ FA(2)	✅
Wapro ERP	Polish ERP	SME–Mid	✅ FA(2)	✅
SAP S/4HANA	International ERP	Enterprise	✅ via localisation	❓
Dynamics 365	International ERP	Mid–Enterprise	✅ via localisation	❓
KSeF e-Urząd Portal	Government portal	Micro	✅ manual only	❌

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