In recent reports of the European Platform tackling undeclared work, it has been recognised that bogus self-employment is not solely or even largely a product of the advent of the collaborative economy, and that undeclared work in the collaborative economy is not solely or even principally composed of bogus self-employment1. Reflecting these advances in understanding, this report is not simply about bogus self-employment in the collaborative economy. Instead, it evaluates separately firstly, the prevalence of undeclared work in the collaborative economy and secondly, bogus self-employment, using the currently available datasets, and following this, examines how Member States are currently tackling these forms of work, and considers what further initiatives could be undertaken. The intention is to enable enforcement authorities to engage in mutual learning around policy solutions, as well as to identify areas of activity where collective action at EU or EU regional level might be a more appropriate way forward.