Tax residency is not about “where you are registered” and not even about “where you opened your sole proprietorship (FOP/JDG).” It answers a different question: which country has the right to tax your income as “worldwide income” (that is, all of it, from all countries). And this is where the most painful issue arises: a person works in Poland, has clients across the EU, at the same time keeps a sole proprietorship in Ukraine — and suddenly feels that taxes might have to be paid “both here and there.”
The good news: in most cases, double taxation can be legally avoided if you properly determine your residency, confirm it with documents, and correctly structure your income.
The bad news: if you “do nothing” and hope it will somehow resolve itself, the risks increase — fines, bank inquiries, tax authority questions, or problems during legalization procedures.
Briefly describe: where you live, how many days in Poland/Ukraine, whether you have a sole proprietorship/company, where your clients are, and who pays you. We’ll explain the logic and next steps without unnecessary theory.
What Is Tax Residency in Simple Terms
Tax residency is a status that determines:
- where you file your annual tax return as an individual;
- where your “global” income is taxed (salary, sole proprietorship/business income, dividends, interest, etc.);
- which double taxation treaty applies if income crosses borders.
Two Main Criteria: 183 Days and “Center of Vital Interests”
In most countries (including Poland), two key tests are used:
- The 183-day rule — if you physically stay in a country for more than 183 days in a tax year, that country may consider you a resident.
- The center of vital interests — where your family lives, where your housing is, where your business and economic interests are located, where your real life takes place.
The complexity lies in the fact that these criteria may apply in two countries at the same time. For example, you spend 7–8 months in Poland (183+ days), but your family and apartment remain in Ukraine. In this case, “conflict resolution” rules apply — explained below.
Where Entrepreneurs Most Often Face Double Taxation Risks
Here are typical scenarios that create either the perception or the real risk of double taxation:
Scenario A: Ukrainian Sole Proprietor + Living in Poland
A person continues issuing invoices as a Ukrainian sole proprietor but physically lives and works in Poland. Logically, Poland may say: “You are our resident — declare your worldwide income.” Without proper structuring, the entrepreneur may either pay twice or fail to comply correctly anywhere.
Scenario B: Polish JDG + Income from Ukraine
You open a JDG in Poland, clients pay from Ukraine, and some income still goes to Ukrainian accounts. Without a clear structure, questions arise: where is the income taxed, where should reporting be filed, how can paid tax be credited to avoid double taxation?
Scenario C: “I’m Just a Freelancer” + Multiple Countries/Banks
In 2026, banks and payment systems increasingly request tax status confirmation (KYC/AML). Without a clear tax position, accounts may be blocked, and you may be asked to explain the origin of funds and provide documentation.
Double Taxation Treaties: How They Actually Work
Countries typically have double taxation treaties (conventions) that:
- determine which country has the primary right to tax a specific type of income;
- provide a mechanism to credit taxes paid in one country to avoid paying again in another;
- contain so-called tie-breaker rules to resolve conflicts when two countries consider you a resident simultaneously.
In a residency conflict, authorities usually assess, in order:
- where your permanent home is located;
- where your center of vital interests is;
- where you habitually reside;
- your citizenship (as an additional factor).
Even if you technically meet the 183-day rule, the actual center of interests may still determine the final outcome.
How to Prove Your Residency: Certificate and Documents
To apply a treaty and avoid double taxation, documents are required — not just statements. The key document is a Certificate of Tax Residence.
It is needed:
- to confirm to another country (or bank) that you are a tax resident of a specific state;
- to apply treaty benefits, for example reduced withholding tax rates;
- to explain why income is not declared in another jurisdiction.
However, the certificate must be supported by facts. Typically, supporting documents include:
- a real address in Poland / rental agreement;
- family documentation (if applicable);
- contracts, invoices, place of work performance;
- proof of tax and social contribution payments;
- bank statements and a logical flow of funds.
Practical Plan: How to Avoid Paying Taxes Twice
Step 1. Count Your Days of Physical Presence
Create a simple table of entry and exit dates for each country.
Step 2. Define Your Center of Vital Interests Based on Facts
Family, housing, expenses, work, accounts, long-term plans — you need a logical explanation supported by evidence.
Step 3. Categorize Your Income
- employment income;
- self-employment/business income;
- dividends/interest;
- capital gains, etc.
Different types of income may be taxed differently.
Step 4. Apply the Double Taxation Mechanism
Usually, either the credit method or the exemption method applies, depending on the income type and treaty provisions.
Step 5. Obtain a Tax Residency Certificate (if needed)
Step 6. Set Up a Clean Payment Structure
Clarify where income is received, which accounts are used, and which taxes are paid. In 2026, this is not only a tax issue but also a banking compliance matter.
How VisaV.pl Can Help
The VisaV.pl team supports entrepreneurs who relocate or operate between countries by helping them:
- understand tax logic and risks;
- choose the appropriate structure: JDG, Spółka, or parallel model;
- prepare documentation packages for banks and tax authorities;
- establish transparent accounting;
- align a legalization strategy in Poland through business.
Describe your situation — we’ll propose 2–3 legal scenarios and explain which is safest for 2026.
