how the treaty taxes business profits,

whether you create a permanent establishment or fixed base,

Tax residency and a Polish JDG: a guide for foreigners in 2026

A Polish sole proprietorship does not automatically make you a Polish tax resident. Understand the 183-day test, centre of vital interests, foreign income and residence certificates.

You can own a business registered in CEIDG without being a Polish tax resident. The reverse is also possible: Poland may be your country of tax residence even if most of your clients are abroad. Your citizenship and business address do not settle the question. What matters is where you actually live, the strength of your ties to Poland, and the applicable tax treaty.

A Polish resident generally reports worldwide income in Poland. A non-resident is usually taxed here only on Polish-source income, subject to the relevant treaty. Registering a JDG does not answer the residency question by itself.

When Poland considers you a tax resident

Under the Polish PIT Act, you are resident in Poland if at least one of these conditions applies:

Poland is the centre of your personal or economic interests, or
you spend more than 183 days in Poland during the tax year.

The word "or" matters. Say you spent only five months in Poland, but your family, home and day-to-day business are here. Poland may still be the centre of your vital interests. The 183-day test is separate: crossing that threshold can establish Polish residence under domestic law even when your other ties are mixed.

What is the centre of vital interests?

The tax authority looks at the whole picture rather than one document. Relevant facts can include:

where your spouse, partner or children live,
where you maintain a permanent home and everyday life,
where you run the business and make important decisions,
where your main income, bank accounts and assets are located,
where your professional and social ties are strongest.

Your CEIDG address is one fact, not a final answer. A residence card, registered address or Polish NIP does not determine tax residence on its own either.

What if two countries treat you as resident?

You then need to read the double tax treaty between Poland and the other country. Treaties usually apply a sequence of tie-breaker tests, such as permanent home, centre of vital interests, habitual abode and nationality. The wording of the specific treaty matters more than a one-line rule found online.

That does not mean you simply pay the same tax twice. The treaty allocates taxing rights and explains how double taxation is relieved. Our separate guide covers double tax treaties for a Polish JDG.

A Polish JDG, foreign clients and working abroad

The client’s location is not the same as the place where you conduct your business. If you work from another country for part of the year, review these issues separately:

your personal tax residence,
how the treaty taxes business profits,
whether you create a permanent establishment or fixed base,
where your services are taxed for VAT,
which country’s social-security system applies.

Neither the Polish registration nor the client’s address settles where the profit is taxed. A developer living in Germany and billing through a Polish JDG may have a different result from someone doing the same work from Warsaw. The working arrangement and the treaty decide.

What a tax residence certificate proves

A certificate of tax residence is an official confirmation of where you are resident for tax purposes. A client, bank or tax authority may request it when applying a treaty. You can also request a Polish certificate through the e-Tax Office.

The certificate is evidence for a stated period, but it cannot repair an inaccurate account of your circumstances. If you moved during the year, or your family and business are split between countries, prepare a timeline and documents showing what actually happened.

Documents to prepare

Before speaking to an accountant or tax adviser, gather:

dates spent in each country,
your immigration status and home addresses,
information about family and permanent homes,
the countries from which you work and make business decisions,
income sources and client agreements,
any tax residence certificates,
social-security information, including an A1 certificate if relevant.

This prevents the analysis from being reduced to citizenship or a day count with no context.

Common mistakes

“I own a JDG, so I must be a Polish tax resident.” CEIDG registration does not decide residence.
“I stayed fewer than 184 days, so Poland cannot treat me as resident.” The centre-of-vital-interests test still applies.
“I pay tax where my client is located.” A client’s address does not by itself determine where business profit is taxed.
“The same rule works for every country.” The outcome can depend on the specific treaty.
“Tax, VAT and ZUS always follow tax residence.” They are separate systems with separate rules.

Official sources

Running a Polish JDG with ties to another country?

Oxyok handles Polish JDG accounting in Polish and English. If your life or work spans two countries, we first map out the facts. New founders can start with the guide to opening a JDG as a foreigner; current monthly options are on the accounting page.

See JDG accounting or email [email protected].

Important: This is general information. Cross-border outcomes depend on your facts and the wording of the relevant double tax treaty.