ZUS and the A1 certificate for a Polish JDG working across borders in 2026
Do you run a Polish JDG and work abroad? Learn which social-security system may apply, when an A1 certificate matters and what facts the authorities need.
Registering a Polish JDG does not automatically put every part of your work under Polish ZUS. If you physically work in another country or regularly operate in several countries, the applicable social-security law must be determined first. An A1 certificate records that result; it is not a system you can choose for convenience.
What an A1 certificate proves
The certificate identifies the country whose social-security rules apply for the stated period. You may need to show it during an inspection abroad. It is not a work permit, a tax-residence certificate or proof that all your taxes belong in the same country.
Two different cross-border situations
The first is a temporary period of similar self-employed work in another country. If the conditions are met, you can generally remain insured in the country where you normally work for up to 24 months.
The second is habitual work in two or more countries, such as recurring on-site assignments. Residence, the substantial part of your activity and the centre of interests of the business then become relevant. That is not simply a sequence of short business trips.
When Polish ZUS may not apply
Suppose you live in one country, have employment in another and also own a Polish JDG. The employment country’s law may apply. For regular work in several countries, notify the institution in your country of residence; the institutions coordinate the decision. A CEIDG entry, Polish NIP or bank account does not settle it.
How to prepare the application
Document what you will actually do: countries and dates, share of turnover and working time, contracts, home address, place of management and evidence that the Polish activity is genuine. For a first application covering regular self-employment in several states, ZUS asks for a forecast for the next 12 months and supporting documents.
Do not confuse A1 with tax or VAT
Tax residence, VAT and social security use separate tests. A1 does not decide where business profit is taxed or how to invoice a foreign client. If you also live outside Poland, read our Polish JDG tax-residency guide.
Official sources
- ZUS: employment in one state and self-employment in another
- ZUS: A1 for self-employment in two or more states
- Your Europe: social-security cover when working abroad
Need to organise your Polish JDG before working abroad?
Oxyok provides Polish JDG accounting in English and Polish. We can organise the bookkeeping facts and tell you when the issue needs a formal ZUS determination or a cross-border social-security specialist. The Polish JDG hub for foreign founders connects A1 with the separate tax-residence and invoicing questions.
See English-speaking JDG accounting from PLN 49 + VAT a month or email [email protected].
Important: This is general information. The applicable law depends on your actual work pattern, residence and the determination made by the competent institutions.