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Top tools
Mikrorachunek Checker
Check whether a mikrorachunek podatkowy number matches the official format and extract the embedded PESEL or NIP.
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.
REGON Number Checker
Check any 9-digit or 14-digit Polish REGON number with automatic format detection and checksum verification.
Top articles
NIP 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.
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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.
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Step-by-step guide to paying tax on rental income in Poland: ryczałt rates, registration, monthly payments via mikrorachunek, and PIT-28 filing.
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