Undeclared work is defined as all paid activities that are lawful as regards their nature but are not declared to public authorities, taking into account differences in the regulations in Member States.
Määratluse kohaselt on deklareerimata töö igasugune tasustatud olemuselt seaduslik tegevus, mida ei deklareerita avaliku sektori asutustele, arvestades liikmesriikide õigusliku reguleerimise erinevusi.