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Poland TIN validator
Check whether a Poland NIP / PESEL follows the expected structure before you save it, send it to an API, or include it in a tax workflow.
Private by design
Your data stays in your browser
None of the TIN data you enter is ever saved to our servers — validation runs entirely on your device.
Validation Workspace
Validate NIP / PESEL
Enterprise checks for Poland tax identification numbers.
Instant one-by-one format validation
How Poland tax IDs are formatted
In Poland, the tax identifier is commonly known as Numer Identyfikacji Podatkowej / PESEL (NIP / PESEL). The expected format is NIP: 10 digits (XXX-XXX-XX-XX), PESEL: 11 digits. Teams usually need a Poland NIP / PESEL check around tax filing, business registration, employment, or before a record moves into billing, onboarding, or compliance review.
Valid examples
123-456-32-1844051401359
Invalid examples
- 123-456-32-19 (Invalid checksum)
- 4405140135 (Too short)
What this validator checks
Format and length
Confirms the number follows the expected Poland pattern: NIP: 10 digits (XXX-XXX-XX-XX), PESEL: 11 digits.
Useful examples
Shows valid and invalid-looking samples so you can compare spacing, separators, letters, and digit counts before submitting real data.
When people usually check this number
- Tax filing
- Business registration
- Employment
- Social security
A format match does not prove that a Poland tax ID belongs to a specific person or business. Use the result as a first-pass data quality check, then confirm sensitive cases with official records.
Official source: Krajowa Administracja Skarbowa
Last reviewed: May 23, 2026. We update country guidance when public format rules change.
How to check a Poland NIP / PESEL
Use this check before a record reaches billing, tax reporting, or manual review.
Enter the NIP / PESEL
Paste or type the Poland tax identifier exactly as it appears in your source record. Spaces and separators are fine when they are part of the expected format.
Review the format result
Check whether the number matches the known Poland structure, including length, separators, letters, and checksum rules where public guidance includes them.
Confirm important records
For onboarding, tax reporting, or compliance work, treat the result as a data-quality signal and confirm high-risk records with Krajowa Administracja Skarbowa or your internal process.
Frequently asked questions
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