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Mikrorachunek Checker
Check whether a mikrorachunek podatkowy number matches the official format and extract the embedded PESEL or NIP.
REGON Number Generator
Generate valid 9-digit and 14-digit Polish REGON numbers with correct check digits for testing.
IBAN Checker: Verify a Polish Bank Account Number
Free IBAN checker and validator for Polish bank accounts. Verifies checksum, identifies the bank by sort code, and shows detailed error reports.
Top articles
How to Pay a PIT Underpayment in Poland
Owe money after filing your PIT in Poland? Learn how to pay a niedopłata step by step, including deadlines, transfer details, and late payment interest.
8 min readHow to Block Your PESEL Number in Poland
Step-by-step guide to blocking your PESEL number via mObywatel, your bank, or in person. Learn what zastrzeżenie PESEL protects and how to reverse it.
7 min readHow to Get a PESEL for Your Child Born Abroad or Newborn in Poland
How to get a PESEL for your child born outside Poland or as a newborn. Required documents, which office to visit, and what to expect.
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