Best E-Invoicing Software for Poland KSeF 2026: Full Comparison
Comparing the best accounting and ERP software for KSeF compliance in Poland. Comarch ERP Optima, InsERT nexo, enova365, WAPRO, and Symfonia โ detailed feature-by-feature breakdown.
Best E-Invoicing Software for Poland KSeF 2026: Full Comparison
With KSeF now mandatory, the question is not whether to get compliant software โ it's which software is actually good at KSeF, and which ones just check a marketing checkbox.
I've looked at the major Polish accounting and ERP platforms and here is my honest assessment.
Quick Summary: Who Is This Guide For?
- Freelancers and micro-businesses โ InsERT nexo (clean, affordable, reliable KSeF)
- Growing SMEs โ Comarch ERP Optima or enova365 (more depth, better integrations)
- Mid-market and enterprise โ enova365 or Comarch ERP XL (full ERP + KSeF + Peppol)
- International businesses with Polish VAT โ Check SAP KSeF connector, Oracle Cloud Financials KSeF module, or Microsoft Dynamics 365 Finance (Poland localisation)
What to Look for in KSeF Software
Before comparing products, here is what actually matters for KSeF compliance:
FA(2) schema generation โ the software must generate FA_VAT FA(2) XML natively, not by downloading a third-party plugin that may not update when the schema changes.
Real-time KSeF API submission โ invoices should be submitted to KSeF the moment they are issued, with immediate status feedback. Batch overnight submission creates risk.
KSeF offline mode support โ when the KSeF API is unavailable, the software must switch to offline mode, store the invoice locally, and automatically re-submit when KSeF recovers.
KSeF reference number storage โ the KSeF Numer Referencyjny must be stored against each invoice record in your system for audit and buyer communication purposes.
Corrective invoice handling โ corrections must reference the original KSeF number, not just the original invoice number.
JPK_VAT reconciliation โ since JPK_VAT and KSeF must be consistent, the software should flag any mismatches automatically.
Comarch ERP Optima โ The Market Leader
Best for: Polish SMEs and mid-market companies looking for a complete accounting suite with deep KSeF integration.
Comarch ERP Optima has been the dominant ERP in Poland for over two decades. The KSeF module was in development from the first voluntary phase in 2021, and as of February 2026 it is the most mature implementation on the market.
KSeF features:
- FA(2) generation native โ no add-ons required
- Real-time API submission with status tracking on the invoice record
- Full offline mode with automatic recovery
- Corrective invoice KSeF reference linking
- KSeF reference number printed on invoices and payment reminders
- JPK_VAT / KSeF reconciliation reporting
- Batch processing for high-volume senders
What I like: Comarch's KSeF support is genuinely deep. The software handles the edge cases that simpler tools miss: fiscal receipt conversion to invoice, self-billing (samofakturowanie), margin scheme invoices with KSeF annotations, and advance invoice reconciliation.
What I don't like: The interface is showing its age โ it's functional but not modern. The cloud version (Comarch ERP XT) is significantly less capable than the desktop Optima. If you want cloud-first, you are somewhat limited.
Pricing: Subscription from approximately PLN 149/month for the basic accounting module. KSeF is included. Full pricing depends on which modules you license.
Verdict: 4.4/5 โ the gold standard for KSeF in Poland if you need comprehensive functionality and don't mind a traditional interface.
InsERT nexo โ The Best for Small Businesses
Best for: Sole traders, freelancers, and small businesses that want reliable KSeF without complexity.
InsERT has been making Polish accounting software since 1991. nexo is their modern platform โ cloud-synced with a clean interface that doesn't feel like it was designed in 2005.
KSeF features:
- FA(2) generation native
- Real-time KSeF API submission
- Built-in KSeF offline mode with automatic re-submission โ one of the better offline implementations
- KSeF reference number tracking on invoice records
- Corrective invoices with KSeF reference
- Test environment mode (ลrodowisko testowe) easily switchable in settings
What I like: InsERT's offline mode is particularly well-executed. The software detects KSeF API issues automatically, issues the offline invoice, queues it, and submits when KSeF recovers โ all without user intervention. This is the safest option for businesses that cannot afford to have invoice issuance blocked by KSeF downtime.
The interface is the cleanest of any Polish accounting tool I've seen. Setup to first KSeF invoice takes under 30 minutes.
What I don't like: No Peppol support yet. If you need Peppol for B2G public procurement or cross-border transactions, InsERT is not there. Also, it is not suitable for complex multi-entity or manufacturing scenarios.
Pricing: Subscription from approximately PLN 89/month. KSeF module included.
Verdict: 4.4/5 โ the top pick for small businesses. Excellent UX, reliable KSeF, solid offline mode.
enova365 โ The Modern ERP Choice
Best for: Growing SMEs and mid-market companies that want cloud-or-on-premise flexibility and both KSeF and Peppol.
enova365 is a modular ERP that has gained significant market share in the last five years, particularly with businesses that want a more modern alternative to Comarch Optima without the complexity of an international ERP.
KSeF features:
- FA(2) native generation
- Real-time and batch API submission modes
- KSeF offline mode
- Peppol access point integration โ unique among Polish tools
- Full corrective invoice handling
- KSeF reference storage and reporting
- REST API for custom integration scenarios
What I like: The combination of KSeF and Peppol in one Polish-market ERP is rare and genuinely useful. If you do B2G invoicing under public procurement (which requires PEF/Peppol), enova365 handles both channels. The REST API is well-documented and the partner ecosystem is active.
What I don't like: enova365 requires a certified implementation partner for full deployment โ you cannot really self-implement a complex setup. This adds cost and time. The base price is also higher than InsERT for comparable functionality.
Pricing: Subscription from approximately PLN 199/month. KSeF and Peppol modules may be additional depending on the package.
Verdict: 4.3/5 โ the best choice if you need both KSeF and Peppol, or if you are outgrowing simple invoicing tools.
WAPRO Gang (Asseco Business Solutions) โ The Traditional Choice
Best for: Companies with an existing WAPRO implementation and accountants familiar with the platform.
WAPRO (now Asseco Business Solutions' WAPRO MAG/fakturowanie line) is one of the oldest Polish accounting software brands. The KSeF module is available and functional, but the implementation feels like it was added reactively rather than designed in.
KSeF features:
- FA(2) generation
- KSeF API submission
- Basic offline mode
- Corrective invoices with KSeF reference
What I like: WAPRO is rock-solid for basic accounting and has a huge installed base. If you already use it, the KSeF upgrade path is straightforward.
What I don't like: The interface is the oldest-feeling of any major Polish tool. No Peppol. The KSeF offline mode implementation requires manual intervention in some scenarios where competitors handle it automatically.
Verdict: 3.8/5 โ acceptable if you are already a WAPRO user, but not a reason to switch to it.
International ERPs: SAP, Oracle, Microsoft Dynamics
If you are running SAP S/4HANA, Oracle Cloud Financials, or Microsoft Dynamics 365 Finance, your KSeF compliance path is through Poland localisation modules or certified connectors:
- SAP: KSeF localization available in SAP S/4HANA Poland localisation pack. Recommended to upgrade to the latest version before enabling.
- Oracle Cloud Financials: Poland KSeF connector available via Oracle Financials for Poland localisation.
- Microsoft Dynamics 365 Finance: Poland KSeF feature available in the Polish country-specific regulatory update (feature: Electronic invoicing โ Poland).
All three major platforms have KSeF support, but enterprise implementations require careful testing in the KSeF test environment (ลrodowisko testowe). Budget for several weeks of QA.
Quick Comparison Table
| Feature | Comarch Optima | InsERT nexo | enova365 | WAPRO |
|---|---|---|---|---|
| FA(2) native | โ | โ | โ | โ |
| Real-time submission | โ | โ | โ | โ |
| Offline mode | โ | โ (best) | โ | Partial |
| Peppol | โ | โ | โ | โ |
| Cloud option | Limited | โ | โ | โ |
| Ease of use | โญโญโญ | โญโญโญโญโญ | โญโญโญโญ | โญโญโญ |
| KSeF depth | โญโญโญโญโญ | โญโญโญโญ | โญโญโญโญ | โญโญโญ |
| Price (PLN/mo) | ~149+ | ~89+ | ~199+ | ~79+ |
| Best for | SME/midmarket | Small biz | SME/mid/enterprise | Existing users |
All prices are approximate and based on publicly available information as of April 2026. Contact vendors directly for current pricing and to confirm specific KSeF feature availability in the version you will be using.