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Search covers the whole knowledge base; topic areas are also available below.

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• KSeFConnecting your business, permissions, certificates, and sending invoices to the National e-Invoicing System.
• InvoicesIssuing invoices, numbering, payment terms, attachments, and sending to a counterparty.
• CorrectionsWhen to issue a corrective invoice, how to prepare one, and what happens to the original document.
• JPKJPK_V7M and V7K — what Atestio fills in automatically, and what is your decision.
• Account & billingPlans, limits, Atestio's own invoices, business details, and managing users.
• IntegrationsConnections to banks, accounting software, and the Atestio API.

Most read

• How to connect your business to KSeF — from granting permissions to the first invoice sent.
• Issuing your first invoice — what must be on the document and what Atestio fills in automatically.
• When to issue a correction — and how a correction differs from cancellation.
• JPK_V7M — what Atestio fills in automatically — and what stays the taxpayer’s decision.

Couldn’t find an answer?

For anything not covered in the knowledge base, or if you run into a problem, get in touch — we reply on business days. If your question concerns a specific document, please include its number — it speeds up our reply.

We help with the technical operation of the Atestio platform (issuing invoices, KSeF/JPK error handling, account management). The application has a technical and supporting role: its suggestions and warnings follow from rules applied to the data you enter. We do not provide tax advisory services — responsibility for the tax treatment of documents and transactions stays with the user; for those questions, please contact a tax advisor or accounting firm.