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MGBI Products Public Registers API API Data Sources

Public Registers API

Individual CIT Taxpayer Data (IDPCIT) API

Automate the retrieval of financial data for Poland’s largest companies from lists published by the Ministry of Finance.

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Product description

Access individual data on CIT taxpayers, published annually by the Ministry of Finance. The data includes key financial figures— revenue, tax base, tax due and paid, and exempt income —for entities subject to the publication requirement.

Our API allows you to search for data for a specific fiscal year based on a registration number— NIP, REGON, or KRS. Results can be filtered by tax year and list version date, enabling you to analyze historical data and compare results across years.

We provide the data in JSON format, which enables automatic processing and direct integration with analytics systems, BI tools, and databases.

The list is updated once a year —after the Ministry of Finance publishes the data for the previous fiscal year.

To learn more, check out our API documentation.

Who is the Individual CIT Taxpayer Data intended for?

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Sales departments

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Universities and research institutions

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Economic publications and industry media

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Scoring data providers

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Banks and financial institutions

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Law firms and consulting firms

Why it is worthwhile?

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Data from an official source

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The financial information is sourced directly from lists published by the Ministry of Finance based on submitted corporate income tax returns. This is official data—reliable and widely accepted in market analyses, rankings, and academic studies.

Search by Tax ID, REGON, and KRS

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You can identify entities using their known registration numbers and quickly retrieve financial data for a specific company for a given year—without having to manually search through files published by the ministry.

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Access to historical data

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Filtering by fiscal year and list version date allows you to analyze data for subsequent years and track trends in revenue, profitability, and tax liabilities for the largest companies.

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JSON format ready for integration

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Structured data in JSON format can be loaded directly into analytics tools, BI systems, or databases—without the tedious task of parsing Excel spreadsheets published by the Ministry of Finance.

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Automation of ranking and analysis

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API integration eliminates the need to manually download and process annual CIT data files. Rankings, sector analyses, and research reports can be generated more quickly and consistently.

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A single interface for multiple registers

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We provide the IDPCIT data model through the MGBI Public Registers API. You can combine financial data with information from the National Court Register (KRS), the National Trade Register (KRZ), the VAT Payers List, and other sources—all through a single interface.

Data in the IDPCIT registry

Taxpayer Identification

Taxpayer's name
Tax ID Number
KRS and REGON numbers
Entity type

Fiscal year

Tax year (fiscal year)
Start and end dates of the tax year
Date of the Ministry of Finance's list

Financial data

Revenue
Tax base
Tax due
Tax paid
Loss
Tax-exempt income

View full content

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What is individual CIT taxpayer data?

Individual data on corporate income tax (CIT) payers is financial information published annually by the Ministry of Finance pursuant to the Corporate Income Tax Act. The publication requirement applies to entities whose revenues have exceeded the threshold specified in the Act.

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The published data includes, among other things, revenue, taxable income, the amount of tax due and paid, and the amount of tax-exempt income. The data is broken down by revenue source—including revenue from corporate groups and from eligible intellectual property rights.

The list is published once a year and includes data for the previous fiscal year. It is one of the few official, publicly available sources of financial data on specific businesses operating in Poland.

Retrieve data conveniently

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Access via API

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Database replicas

Contact Us

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Product used

Public Registers API

For what purpose do you intend to utilize this product?

How many records containing data on individual entities or persons do you intend to retrieve monthly?

Provide your contact information

First and last name

Company Tax ID / VAT Number

Email address

Phone number

MGBI sp. z o.o.
ul. Marszałkowska 58/15
00-545 Warsaw

NIP 7010446505

REGON 360001489

KRS 0000533676

District Court for the Capital City of Warsaw
in Warsaw, 12th Commercial Division
of the National Court Register