About us — Liczbnik

Last updated: 15 June 2026 · Checked: 15 June 2026 · Next review: September 2026

Liczbnik is a free online calculator service built for users in Poland. Over 100 tools across 26 categories and 3 languages (Polish, English, Ukrainian) covering taxes, salaries, loans, social insurance, health and much more — no registration required, no ads obscuring results, no hidden charges.

Our mission

Liczbnik was built so that anyone can quickly and reliably check their financial, tax or health figures — without needing a specialist for everyday questions. We believe access to accurate calculation tools should not be a privilege. That is why all calculators are and will remain free, run entirely in the browser (no data is ever sent to a server), and are updated after every legislative change. Rates and thresholds reflect the law in force in 2026.

Our editorial approach

We build content and calculators in two stages: first we prepare a formula and description from a legal act or official notice, then we verify every rate and result against the primary source. Formulas are implemented as pure functions covered by unit tests, so a rate change does not introduce hidden regressions. We never state a figure “from memory” — every number has a traceable basis. Some initial drafts are prepared with the help of AI tools, but every rate, threshold and formula is manually verified by a human against the official source before publication — AI is never the sole source of a number.

How we verify our data

Every calculator relies exclusively on official Polish legal and regulatory sources. Formulas are cross-checked against official simulators (e.g. the ZUS calculator and the Ministry of Finance e-Deklaracje system). Rates and thresholds are updated each January and immediately after significant legislative changes take effect. A full description of calculation methods, sources and the verification process is available on our Methodology and data sources page (in Polish).

Data sources

We use only primary, publicly available sources from state institutions and expert bodies:

ZUS (zus.pl): social and health contribution rates, assessment bases, annual limits
Ministry of Finance (mf.gov.pl): PIT thresholds, tax-free amount, income tax and VAT rates
GUS (stat.gov.pl): inflation and average wages in the economy
NBP (nbp.pl): exchange rates and reference rates
ISAP / Journal of Laws: legal acts: PIT Act, Social Insurance Act, VAT, Civil Code
WHO / scientific publications: definitions and formulas for health calculators

Who is it for?

Liczbnik is designed for anyone who needs a quick and reliable answer to a financial or tax question:

Salaried employees who want to check their net pay
Freelancers and entrepreneurs on B2B or civil-law contracts
Investors planning deposits, bonds and mortgages
Students learning personal finance and accounting

Liczbnik in numbers

Calculators: 100+
Categories: 26
Languages: 3

Update policy

We update data in two modes: every January we run a full review of contributions, PIT thresholds, the tax-free amount, VAT rates and the minimum wage, and on an ongoing basis we apply changes immediately after a significant legal act is published in the Journal of Laws. Each dataset carries metadata with its verification date.

Accuracy of results

We do our best to ensure results are correct and up to date. At the same time, individual tax and financial situations can be complex — Liczbnik does not replace consultation with a tax adviser, accountant or lawyer. Results should be treated as a guide for further action, not as a binding interpretation of the law. Found a bug? Let us know — we check every report against the primary source and commit to correcting a confirmed error, noting the date of the correction.

Frequently asked questions

Is Liczbnik free?

Yes, every calculator is completely free, with no registration and no hidden charges. Calculations run in your browser — no data is sent to a server.

Where do you get your data and rates from?

Exclusively from official sources: ZUS, the Ministry of Finance, NBP, GUS, and ISAP/Journal of Laws. A full description is on our Methodology and data sources page.

How often do you update the calculators?

In two modes: a full review every January (new contributions, PIT thresholds, tax-free amount) and on an ongoing basis, immediately after a significant legal change takes effect.

Are the calculators accurate?

We do our best to keep results aligned with current law and verify them against the primary source. They remain informational, though, and do not replace individual advice from a specialist.

Who is behind the project?

Content and calculators are prepared by the Liczbnik editorial team based on official legal sources, with every rate verified against the original document. Our author list is published on the Authors page.

Is this tax or financial advice?

No. Results are informational and indicative only — they do not constitute tax, legal or financial advice and do not replace consultation with an adviser.

Can I report a mistake?

Yes — contact us via the Contact page. We check every report against the source and, once confirmed, correct the data and note the correction date.

Why does the result differ from another calculator?

This is usually due to different assumptions: a different tax year, rounding method, or whether certain reliefs and deductible costs are included. Check what data the other tool relies on.

What languages does the service support?

Liczbnik is available in three languages: Polish, English and Ukrainian. The set of calculators differs slightly between versions, matched to each audience.

Do you rely on official sources?

Always, and exclusively — ZUS, the Ministry of Finance, NBP, GUS, ISAP/Journal of Laws, and scientific publications for health calculators. No rate is ever taken "from memory".

Browse all calculators →

Calculator results are for informational purposes only and do not constitute tax, legal or financial advice. Health calculators do not replace a medical diagnosis.