- Tax Office e-Portal
- Central Register of Business Activity (CEIDG)
- National Court Register (KRS)
- ZUS Electronic Services Platform
- PKD Codes (Business Classification)
- Tax micro-account generator
- National Tax Information (KIS)
- Wykaz podatników VAT
- VAT Number Verification - VIES
- System informacyjno-usługowy dla przedsiębiorców
- ZUS contribution account number lookup
as of 2026-05-26
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