Unintended Effects of Transparency: The Consequences of Income Disclosure by Politicians

Public disclosure laws on politicians’ outside income aim to enhance electoral accountability, but their effects remain unclear and may backfire. Using a German disclosure reform, administrative tax data, and a difference-in-difference design, we show that MPs increased their outside income after public disclosure. We find suggestive evidence that the effect is driven by right-leaning MPs. A survey among voters shows that perceptions of outside income differ by party alignment: right-leaning voters view it as a sign of competence, while left-leaning voters associate it with weaker voter representation. These findings highlight the complex interplay between transparency, voter perception, and political behavior.