What to know about e-invoicing in Poland

What matters for you as a freelancer

• ✓This country requires invoices to be cleared through a government platform before they're valid — a fundamentally different, larger integration than ZUGFeRD/Factur-X.
• ✓If you invoice domestic B2B clients here today, check with a local tax advisor on your current obligations — this is a bigger technical lift we haven't started yet.

What you don't need to worry about

• –This only applies to domestic B2B invoices within this country — it doesn't affect invoices you send to clients elsewhere.
• –There's no action needed if you don't currently invoice B2B clients based in this country.

What must be on a valid B2B invoice

• ·Both parties' details, including NIP (tax ID)
• ·Invoice number and transaction date
• ·Description of goods or services
• ·Net amount, VAT rate, and VAT amount
• ·For structured KSeF invoices: the mandatory FA(3) XML blocks (header, both parties, invoice body)

Source: podatki.gov.pl — FA(3) structured invoice technical specification — official source