“…Tax-preparation services utilize professional service providers, and recommendations are mandatory for their success [ 4 , 5 , 7 , 9 , 20 ], as are quality labels [ 3 , 11 ]. According to principal–agent theory, principals (i.e., taxpayers in the context of this study) hire agents (i.e., tax-preparation services) [ 10 , 13 , 21 ] because they want to complete tasks that they cannot, for many reasons (e.g., limited time, insufficient knowledge, high costs), complete by themselves [ 6 , 10 , [22] , [23] , [24] , [25] , [26] ]. Therefore, agents promise that the tasks in question will be completed adequately [ 13 ].…”