Double Taxation Treaties in Poland 2026
Double taxation treaties in Poland 2026. How they work, proportional method, exemption method, tax residency.
Do you work with clients from several countries? Have you moved to Poland but earn income from abroad? Double taxation treaties decide in which country you will pay tax.
In this guide, I explain how double taxation treaties work in 2026.
Double taxation — double taxation treaties explained
Working abroad or earning income in two countries? Double taxation treaties (DTTs) determine which country taxes your income and how much. The key concept: tax residency.
🌐 Tax residency — where do you pay tax?
Tax residency is the country where your centre of vital interests lies (personal and professional). It determines where you tax your worldwide income.
Two methods of avoiding double taxation
Bilateral treaties use one of two methods. The choice affects whether and how your foreign income is taxed at home.
| Feature | Proportional method | Exemption method |
|---|---|---|
| How it works | Foreign income is taxed in both countries, but your home country grants a proportional credit — it deducts the tax paid abroad (up to the domestic tax limit on that income). | Foreign income is exempt from tax at home, but it is counted to determine your tax bracket — it can push you into a higher rate on your domestic income. |
| Example | You earn €50,000 in Germany and 30,000 zł in Poland. You pay tax in Germany and credit it against the Polish tax on the same income. | You earn £50,000 in the UK and 30,000 zł in Poland. The UK income is exempt in Poland, but it "pushes" you into a higher tax bracket on your Polish income. |
| Best for | When the foreign tax rate is lower than the domestic one (e.g. some EU countries). You deduct the full tax paid abroad. | When the foreign tax rate is higher or you want to avoid double taxation of the same income stream. |
| ⚠️ Risk | The credit is capped at the domestic tax on that income. Any excess foreign tax is lost. | Progression effect — exempt foreign income can push you into a higher bracket on domestic income, increasing your total tax. |
🗺️ Which countries use which method?
Examples of the most common bilateral treaties with Poland. The method depends on the specific treaty — always check the DTT text.
⚖️ Countries using the proportional method
Germany, France, USA, Austria, Belgium, Denmark, Netherlands, Italy
🚫 Countries using the exemption method
United Kingdom, Ireland, Sweden, Norway, Spain, Portugal, Czech Republic, Slovakia
Key rule: First, determine your tax residency (183 days + centre of vital interests). Then check the method in the bilateral treaty — it decides whether you credit foreign tax (proportional) or the income is exempt (exemption). Getting the method wrong = double taxation or penalties.
Working abroad or earning income in two countries? Let's check how to optimise your tax settlement.
Let's talk →Based on art. 3 sec. 1a of the PIT Act (residency — centre of vital interests). Art. 27 sec. 9 and art. 30a sec. 10 (abolition relief / proportional method). Art. 23 of bilateral DTTs. The 183-day rule derives from art. 4 of the OECD Model Convention.
What Is a Double Taxation Treaty?
It is an international agreement between two countries that determines which state has the right to tax a given income. Poland has signed such treaties with over 90 countries.
Why Are They Needed?
Without a treaty, the same income would be taxed twice: in the source country (where it arose) and in the residency country (where you live). This would kill cross-border businesses.
Tax Residency — A Key Concept
Before applying a treaty, you need to know who you are — a tax resident of which country?
Polish Resident (Art. 3 sec. 1 of the PIT Act):
- You have your centre of vital interests in Poland (family, work, contacts)
- or you stay in Poland more than 183 days in a year
A Polish resident pays tax in Poland on all of their income — Polish and foreign.
Foreign Resident:
- Centre of vital interests abroad
- Pays tax in Poland only on Polish-source income
Residency Conflict
If you live in two countries — e.g., you work in Poland but your family is in Germany — the double taxation treaty resolves where you are a resident. Criteria in treaties:
- Permanent home (where you have a house)
- Centre of vital interests (where you have family and business)
- Habitual abode (where you spend the most time)
- Citizenship (final criterion)
Two Methods of Avoiding Double Taxation
Treaties use two methods. Which one applies — depends on the treaty between Poland and the given country.
Proportional Method (with deduction)
Most of Poland's treaties use this method. It works as follows:
- Calculate Polish tax on total income (Polish + foreign)
- Calculate the proportion: foreign income / total income
- Deduct the foreign tax, but no more than the proportional share of Polish tax
Example:
- Income from Poland: 80,000 zł
- Income from Germany: 20,000 zł
- Tax paid in Germany: 4,000 zł (20%)
- Polish tax on total (100,000 zł): 14,400 zł
- Proportion: 20,000 / 100,000 = 20%
- Deduction limit: 14,400 × 20% = 2,880 zł
- You deduct min(4,000, 2,880) = 2,880 zł
- To pay in Poland: 14,400 − 2,880 = 11,520 zł
Exemption Method (with progression)
Less common. It works as follows:
- Foreign income is exempt from taxation in Poland
- But foreign income affects the tax rate applied to Polish income (progression)
Example:
- Income from Poland: 80,000 zł
- Income from Germany: 20,000 zł (exempt)
- Tax base: 80,000 zł
- But the rate is calculated from 100,000 zł → a higher rate than from 80,000 zł
The exemption method is more favorable when foreign income is low (because Polish tax is lower).
Which Countries Use Which Method?
Proportional Method (with deduction):
- Germany, France, United Kingdom, Ireland, USA, Netherlands, Belgium, Italy, Spain, Norway, Sweden, Denmark, Finland, Portugal, Greece
Exemption Method (with progression):
- Czech Republic, Slovakia, Russia, Belarus, Ukraine, Lithuania, Latvia, Estonia
Note: This is a simplified overview. Always read the specific treaty.
How to Settle Foreign Income?
PIT-36 (Tax Scale)
If you are on the tax scale and have foreign income — you file PIT-36 with attachment PIT/ZG:
- PIT-36 — Polish income
- PIT/ZG — foreign income (a separate attachment for each country)
- You report: foreign amount, foreign tax paid, avoidance method
PIT-36L (Flat Tax)
Similar to PIT-36, but for flat tax. Attachment PIT/ZG.
Lump-Sum Tax (PIT-28)
The lump-sum tax is less flexible with foreign income. If foreign income is business revenue — you apply the lump-sum rate. But foreign tax paid can be deducted from the lump-sum tax (Art. 11 sec. 2 of the Lump-Sum Tax Act).
Most Common Situations
1. Full-Time Employment in Poland + Foreign JDG Income
- Employment: taxed in Poland (resident)
- JDG: taxed in Poland (if the business is operated in Poland)
- Foreign JDG income: depends on the treaty
2. Foreigner Living in Poland, Income from Home Country
- Polish resident (over 183 days + centre of interests)
- Poland taxes all income
- You deduct tax paid abroad (proportional method)
3. Pole Living Abroad, Income from Poland
- Foreign resident
- Poland taxes only Polish-source income (e.g., property rental)
- Country of residence taxes everything, but deducts Polish tax
FAQ
Does Poland have a treaty with every country?
No. Poland has treaties with over 90 countries. Without a treaty — foreign income is taxed in Poland (if you are a Polish resident), and foreign tax can be deducted (Art. 30 sec. 1 pt. 2 and Art. 30a sec. 5 pt. 2a of the PIT Act).
Can I deduct foreign tax on the lump-sum tax?
Yes, but only proportionally (Art. 11 sec. 2 of the Lump-Sum Tax Act). You deduct no more than the lump-sum tax on that income.
What if I am a resident of two countries?
The treaty resolves this — criteria: permanent home, centre of vital interests, habitual abode, citizenship.
Does the double taxation treaty apply to VAT?
No. Double taxation treaties apply to PIT/CIT (income/corporate tax). VAT is governed by EU regulations (VAT Directive) and national VAT laws.
Need Help?
I provide accounting for JDG with foreign income — PIT-36, PIT/ZG, avoidance methods. From 49 zł + VAT per month.
Contact me at [email protected] or visit oxyok.com/en.
Note: Double taxation treaties decide where you pay tax. Check your residency and the applicable method (proportional vs. exemption). Consult an accountant before making a decision.
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