Voters are frustrated by the influence of money in politics. They cannot be certain whether politicians follow the money or the will of the people. Disclosing side income may therefore serve as a means to increase trust in politicians. To investigate whether this mechanism works, we analyze data from a vignette survey experiment on parliamentarians’ side jobs with respondents from seven European countries (N $ \approx $ 14,100). Our results show that compared to parliamentarians who are unwilling to disclose their side income, transparent parliamentarians, even those with especially high extra-parliamentary earnings, are seen as more trustworthy and electable. We also find that voters rely on the combined information of the number and type of side jobs (companies versus public interest groups) when evaluating non-transparent parliamentarians. Furthermore, voters’ income, education level, and ideological leaning moderate their perceptions of (non-)transparent parliamentarians. Overall, our findings suggest that politicians’ disclosure of side income benefits representative democracy.

Research has explored the impact of politicians holding second jobs, or moonlighting, on their performance and recruitment, but less is known about how citizens respond to such behavior. Citizens may react negatively to Members of Parliament (MPs) moonlighting, viewing outside earnings as a conflict of interest or a distraction, or instead they might view MPs with second incomes positively, seeing them as a connection with the “real world” beyond politics. Utilizing a series of survey experiments, we assess how British citizens respond to MPs moonlighting. We demonstrate preferences more complex than those revealed by traditional survey instruments. Citizens respond to both size and source of income. They do not respond negatively to all second incomes; they are more sympathetic to the entrepreneur who continues to draw an income than medical doctors or lawyers who continue to practice. They are most hostile to politicians who take on part-time company directorships.