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Top tools
REGON Number Checker
Check any 9-digit or 14-digit Polish REGON number with automatic format detection and checksum verification.
PESEL Number Checker
Enter a PESEL number to extract the birth date, gender, and verify the check digit. Works as both a PESEL checker and validator.
Polish IBAN Generator
Generate a valid Polish IBAN from a bank code and account number. See the 28-character PL IBAN format with a real example.
Top articles
How to Pay Tax on Rental Income in Poland
Step-by-step guide to paying tax on rental income in Poland: ryczałt rates, registration, monthly payments via mikrorachunek, and PIT-28 filing.
10 min readWhen Do You Have to Give Your PESEL in Poland? Your Rights Under RODO
Learn when you're legally required to share your PESEL number in Poland and when you can refuse under RODO (GDPR). A foreigner's guide to data protection.
8 min readNIP Number in Poland: How to Find, Check, and Validate It
What is a NIP number in Poland? Learn how to find your own NIP, check a company's tax ID, and validate any Polish NIP online.
7 min readLet's build Poland.gg together
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