Nine tools.
One field.
The register tools query the official register when you run a check — not a copy of ours. The calculators and the PKD search work instantly in your browser.
VAT White List
VAT status, REGON, address and bank accounts of the entity from the VAT Payers Register (for natural persons — the town and number of accounts, no REGON).
Company data from KRS
Legal form, activity codes, capital, address and representation — by tax ID or KRS number.
Account verification
Whether the account is listed for that tax ID — with a request ID as proof.
Bulk NIP — many at once
Paste a list of tax IDs, get a table with VAT status, KRS and accounts (for natural persons — their number). Export to CSV and JSON.
Tax micro-account
An individual account for PIT, CIT and VAT payments — derived from a tax ID or PESEL.
PKD 2025 codes
The right code by name or number. The full, current list of 728 subclasses.
Late-payment interest
Commercial and statutory interest, computed period by period on current NBP rates.
VIES — EU VAT
Validity of a counterparty's EU VAT number in the European Commission system.
REGON register
REGON and official entity data by tax ID; for natural persons and civil partnerships only the name, form, town and activity status, no REGON number.
GUS (REGON) API
Programmatic access to REGON data by tax ID — REST/JSON and an MCP server, no API key.
VAT White List API
VAT status and entity data by tax ID — REST/JSON, no key. Many NIPs via /nips.
KRS API
Selected KRS extract data by tax ID — legal form, capital, representation, board functions (no names), PKD. REST/JSON, no key.
VIES API (EU VAT)
Validate an EU VAT number — valid, name and address (for PL numbers just the town). REST/JSON, no key, no SOAP.
We keep no copy
of the registers.
The register tools fetch data from the institution's official API when you run a check: straight from your browser, or through our server for REGON and VIES. That is why the result is as current as the register itself — and why we never need to know anything about you.
VAT Payers Register
VAT status and bank accounts, account verification, micro-account.
National Court Register
Current extracts: legal form, activity codes, capital, representation.
REGON and PKD 2025
Entity registry data and the full classification of economic activity.
Reference rate
The basis for statutory and commercial interest calculations.
VIES system
Validation of EU VAT numbers across all member states.
For AI agents
The same data as an MCP server and REST endpoints — no form needed. Since 26 Sep 2026, data on natural persons is limited (GDPR), and since 27 Sep 2026 the same applies to the tools on this site.
Frequently asked questions
What is skanfirmy.pl?
skanfirmy.pl is a free set of tools to verify Polish companies by tax ID (NIP) or KRS number, and EU VAT numbers — VAT status, registry data, bank accounts, PKD codes and late-payment interest, straight from official government registers.
Is skanfirmy.pl an official government site?
No. skanfirmy.pl is an independent, privately run tool — it is not affiliated with, authorized, or endorsed by the Ministry of Finance, the Ministry of Justice, Statistics Poland (GUS), or the European Commission. It only uses their public, open APIs.
Is it free, and do I need to register?
Yes, all nine tools are free and require no account or login. Enter a number and see the result immediately.
Where does the data come from, and how current is it?
Register data is fetched live, at the moment of the query, straight from the Ministry of Finance, Ministry of Justice, GUS and the European Commission's VIES system APIs — not from our own, potentially stale copy. The exceptions are built into the site: the PKD 2025 code list (a copy of the official GUS classification) and the NBP reference-rate history used by the interest calculator. Details of how data is processed are in the privacy policy.
Can AI agents use skanfirmy.pl automatically?
Yes. Besides the human interface, skanfirmy.pl exposes an MCP server (skanfirmy.pl/mcp) with nine tools an agent can call directly, plus fetchable endpoints /nip/{number}, /nips/{list}, /regon/{number} and /vies/{country}/{number} that return the data without any form. Details in llms.txt.
I have a list of counterparties to check — how do I do it in bulk?
Use the separate Bulk NIP — many at once tool: paste the whole list (up to 3,000 tax IDs), and the tool queries the Ministry of Finance VAT White List in batches straight from your browser and returns a table with each entity's VAT status, bank accounts, REGON and KRS number (for natural persons running a business only the VAT status, town and number of accounts, no REGON — GDPR). You can download the result as CSV (Excel) or JSON.
Do you offer anything beyond the tools?
Yes — besides the self-service tools, I run consulting for sole traders and small companies that want to bring AI into their day-to-day work. Three packages: an audit, a setup and monthly support. More under Services.