No visa, inside the EU
Poland and Belgium are both in the EU, so you can live and work in Belgium without a visa or work permit. A valid ID card or passport is enough.
Important: if you stay longer than 3 months, register at your commune (gemeente) within 3 months of arriving; you get a registration certificate and can ask for the electronic EU card (E card). Also join a health insurance fund (mutualité / ziekenfonds).
Your checklist in Poland
- A valid ID card or passport.
- Documents in one folder: birth and marriage certificates, diplomas, work references, driving licence.
- Money for the start: a deposit (on a blocked account in your name: at most 2 months' rent in Brussels and Wallonia, 3 in Flanders), the first rent and a few weeks of living costs.
- Tell your Polish bank you are moving and keep the app working, so you can pay bills at home.
- Set up Polish TV before you go, so it works from day one (how to watch Polish TV in Belgium).