It turns out from the Eurostat data that Poland holds the third place in Europe in terms of the number of the so called portfolio workers, i.e. persons who work for more than one employer. Yet, it is a mistake to claim that portfolio working is a new phenomenon in our country. As early as in the 30. of the 20th century, almost 60% of professional workers earned their living additionally from farming. Nevertheless, the contemporary portfolio working is changing its character. Portfolio workers are usually persons with high professional experience and unique qualifications. They include for example physicians, nurses, teachers, academic teachers, lawyers, translators, journalists. What are their motives to search for an additional job? Financial motives are the major ones, but also a chance for constant professional development, and even the sense of autonomy and security due to becoming independent from one employer.