Social security payments and possible exemption
Belgian income tax is very high and all staff and employers are liable. However, if the candidate is contracted to work in Belgium for fewer than six months they may apply for an exemption – such an application must be accompanied by proof that the candidate is covered by a private health insurance policy.
You are warned that if a contract is initially for fewer than 6 months, but is then extended beyond six months, the company becomes liable for social security payments from day one.
How do I apply for a Belgian Work Permit