KSeF 2026 dates for SMEs — a practical receive & issue checklist timeline
Polish mandatory e-invoicing through KSeF (Krajowy System e-Faktur) is rolling in phases. Small firms and foreign sellers often mix up “receive” and “issue” dates. This page restates the dates already used on our product pack — from official Ministry of Finance (MF) materials — in plain English. It is educational only. It is not tax advice, not legal advice, and not the official MF taxpayer application.
Who this guide is for
- Polish SMEs that must receive structured invoices from suppliers
- Issuers preparing for their mandatory issue date (large vs remaining vs tiny issuers)
- Foreign sellers who touch Polish B2B invoices and need a dated checklist, not software
Core dates (verify on MF pages)
- 1 February 2026 — Receiving via KSeF generally mandatory; issuing mandatory for large taxpayers (2024 sales with VAT > 200 mln PLN); KSeF 2.0 production.
- 1 April 2026 — Issuing mandatory for remaining taxpayers (subject to tiny-issuer monthly relief).
- Through 31 December 2026 — If monthly sales documented by relevant invoices stay ≤ 10 000 PLN brutto, issuing outside KSeF may still be allowed (transitional).
- 1 January 2027 — Issue obligation for previously deferred tiny issuers.
These bullets match the dates documented on KSeF-Ready. Always re-check the live MF portal before you decide filings.
Receive vs issue — keep them separate
- Receive: Can your team pull or accept structured invoices from KSeF? Who owns the inbox? How do you match them to purchase orders and payments?
- Issue: Which date applies to you as an issuer (large / remaining / tiny)? Which tool creates FA(3) XML? How will customers be told?
- Foreign sellers: Scope and exceptions depend on Polish rules and your facts — use MF guidance and a licensed advisor; do not rely on a blog post alone.
SME readiness checklist (first pass)
- Write down your likely receive date (generally 1 Feb 2026) and your likely issue date (1 Feb / 1 Apr 2026 or 1 Jan 2027 for deferred tiny issuers).
- List every system that creates or stores invoices today (ERP, accounting SaaS, spreadsheets, e-commerce).
- Confirm who authenticates to KSeF (owner, accountant, proxy) and document the process.
- Ask top suppliers whether they will issue via KSeF from February 2026 and how you will receive files.
- Draft a one-page customer note for when you start issuing via KSeF (date, contact, what changes for them).
- Book a short review with your accountant before the relevant deadline — this checklist is not a substitute.
What “done” does not mean
Checking boxes does not make you “KSeF compliant.” Exclusions, special procedures, and corrections exist. National rules and your facts matter. Use the official portal and a licensed advisor for decisions that affect filings.
Official sources (verify live)
Want printable checklists? KSeF-Ready Starter packs receive + issue checklists and a who-is-in-scope sheet — $29.90 one-time via Polar. Educational only. Not the MF app.
Educational materials only. Not legal advice. Not tax advice. Not the official MF / KSeF application. Operator: Ismail Kanto.