Balancing multiple full-time jobs: practical limits

An employee may enter into multiple employment relationships with two, five, or even ten employers. These relationships will form the basis for compulsory social security coverage, provided the work is genuinely performed under contract. The concept of a ‘sham’ employment contract applies only when work, or contributions deemed as such by the employer, are not performed in accordance with the established agreement. – Łukasz Chruściel comments for Rzeczpospolita.

Full article in Polish avialible here.