This paper studies the determinants of voluntary Internet financial reporting (e-disclosure) by local public administrations. It presents hypotheses regarding the relationship between e-disclosure and city size, the issuing of municipal bonds, financial features, Internet visibility, the level of e-government and diverse political aspects. It also examines the influence of external factors, such as citizens' income level, their educational level and their socio-political commitment. The hypotheses were empirically tested, using a sample of 92 Spanish local public administrations. The data support the hypotheses, with different levels of robustness, and show that size, political will and citizens' income level all affect e-disclosure.