Order in data. Clarity in tax processes.
OnTax automates the entire JPK and KSeF workflow, from validation through submission to archiving. Your team gains full control, and every file has its place, version history and confirmation
The Challenge
In many tax teams, the biggest challenge is controlling files and versions. Submissions turn into corrections, re-uploads and constant confirmation of which file is final. Over time, this increases risk and wastes hours on coordination instead of tax work
In many tax teams, the biggest challenge is controlling files and versions. Submissions turn into corrections, re-uploads and constant confirmation of which file is final. Over time, this increases risk and wastes hours on coordination instead of tax work
After submission, corrections and re-uploads begin, and version confusion follows
Drafts circulate across folders and inboxes, with no clear “final” file
Different users work on different data sets, increasing the risk of errors
Audits take hours due to searching for confirmations and reconstructing actions
No clear overview of submission status and pending corrections
All JPK and KSeF files are stored in one structured workspace
Automatic validation before submission prevents common errors
Full action log showing who uploaded, generated (JPK/eSF/eFV) and submitted each file
Dashboard with deadlines and days remaining until the next VAT submission
Full workflow visibility in one view, without folder browsing or manual document chasing
Compliance automation built for JPK and KSeF workflows
OnTax brings four modules that reduce manual work, prevent errors and keep tax reporting audit-ready
JPK Module
Generates and validates JPK structures (VAT, invoices, inventory, accounting books and more), including corrections and secure archiving.
VATchecker
PrepVerifies contractors against the White List and VAT status, with downloadable reports and query identifiers for audit proof.
e-Financial Statements
Creates eSF reports in the correct XML structure, with full validation, attachments and support for multiple entity types.
e-Invoices (KSeF)
Generates, validates and submits structured invoices to KSeF, tracks statuses and retrieves KSeF numbers automatically.
Who is it for?
OnTax works best in:
Tax and finance teams handling many files and corrections
Companies that want order without changing workflows
Organisations using ERP and looking for cloud integration
Teams that don't want IT involvement
Businesses needing GDPR compliance and KSeF readiness
Tax and finance teams handling many files and corrections
Companies that want order without changing workflows
Organisations using ERP and looking for cloud integration
Teams that don't want IT involvement
Businesses needing GDPR compliance and KSeF readiness
Always current, verified data
Your team works on data that is up to date and validated at every step.
Clear control over files and versions
No more duplicates, unclear drafts or “which file is final?” situations.
Full transparency and audit-ready history
Every action is logged, so changes and submissions can be traced instantly.
Fewer errors, less rework
Reduce corrections and recover time for analysis instead of manual fixes.
How collaboration works?
From first contact to launch, with no unnecessary complexity
Agreement & kick-off
We sign the agreement and confirm the project plan, timeline and contact persons on both sides.
Analysis & data mapping
You provide the data model and input files. We verify compliance with required schemas, propose data mapping and deliver mapping documentation.
Configuration & go-live
We create the company account and user access, run a demo/configuration session, and load the first dataset together. Support is provided via a dedicated ServiceDesk.
FAQ
Clear answers to common questions
OnTax covers the full workflow in one place: file generation, validation and submission for JPK and KSeF. It also supports eSF validation and clear status tracking.
All files are stored and versioned centrally. Updates, corrections and submissions are logged and linked to a specific user, so the team always works on one consistent set of data.
Yes. OnTax keeps a full action log showing who uploaded, generated and submitted each file. It also stores confirmations and change history, so audit preparation does not depend on manual reconstruction.
No. OnTax organises and controls the processes you already run. Teams can keep their current way of working without adding extra steps.
Yes. OnTax integrates with ERP environments such as SAP, Comarch and Oracle, as well as other finance and accounting systems.
