The inFakt Alternative Question: Where Biurko.io Actually Fits

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KSeF Login in 2026: Trusted Profile, Signature or Certificate
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KSeF Login in 2026: Trusted Profile, Signature or Certificate

The first login to KSeF (Poland's mandatory national e-invoicing system) trips up more people than issuing the actual invoice. The Taxpayer Application shows several authentication methods, and none of them explains which one is right for you. This is not a trivial choice. Since 1 February 2026, KSeF has been mandatory for the largest companies, and since 1 April 2026 for all other businesses (Ministry of Finance timeline). Without valid authentication you can neither issue nor receive a structured invoice.

Automatic KSeF Resubmission After an Outage: How Biurko Handles It
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287

Automatic KSeF Resubmission After an Outage: How Biurko Handles It

An invoice issued in offline24 mode must reach KSeF (Poland's mandatory national e-invoicing system) by the end of the next business day. Nobody sends you a reminder. Biurko detects when the KSeF gateway stops responding, issues the invoice in offline mode with the required QR codes, holds it in a queue, and pushes it through the moment the system recovers. No clicking, no duplicates, full audit log.

KSeF Certificate vs Token: Why We Built Biurko on Certificates
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377

KSeF Certificate vs Token: Why We Built Biurko on Certificates

A token carries permissions inside it. A certificate proves identity and nothing else. You cannot issue an offline invoice with a token, and you cannot even request a certificate while authenticated with one. In June 2026 Poland's Ministry of Finance proposed keeping tokens permanently. Our decision has not changed, and here is why.

KSeF for Accounting Firms: Handling 30 Clients Without 30 Logins
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365

KSeF for Accounting Firms: Handling 30 Clients Without 30 Logins

You do the books for 30 companies. Every morning you open the KSeF Taxpayer App — KSeF (Krajowy System e-Faktur) is Poland's mandatory national e-invoicing system — switch the context to your first client, pull their invoices, switch to the second, pull again, switch again. Thirty times over. That isn't work. It's a penalty for having clients. Since 1 April 2026, KSeF has been mandatory for nearly every company in Poland, so this stopped being a big-corporation problem — it's every accounting office's daily reality. The good news: you don't need 30 separate accesses. The bad news: the free government tool wasn't built for someone juggling thirty NIPs (Polish tax IDs) at once. This guide covers why logging in client-by-client is a dead end, how the one-certificate-per-firm model works, and how to serve every client from a single dashboard.

How to Grant KSeF Permissions to Staff or an Accountant
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How to Grant KSeF Permissions to Staff or an Accountant

If your Polish company is owned or run from abroad, the permissions question in KSeF (Poland's national e-invoicing system) usually comes down to one form you can't avoid: the ZAW-FA. A Polish sole trader can skip it. A foreign-owned limited company almost always cannot. This matters because KSeF is already mandatory — since 1 February 2026 for the largest taxpayers and since 1 April 2026 for all remaining VAT payers. Throughout 2026 there is a grace period with no penalties for technical errors, but from 1 January 2027 failing to issue an invoice through KSeF can cost up to 100% of the VAT shown on it. Getting access right for the people who actually issue and book your invoices is worth doing now, calmly. Below: who files ZAW-FA and when, how to designate your first user, and how to grant access to an employee or accounting office.

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