Compliance with income tax payment might increase if every return included an optional section breaking down government functions into various broad categories (social, military, health, interior, transportation, and perhaps a write-in blank) allowing families to choose where to direct their personal share of the burden.
This cannot be legally binding (the tax-exempt would have no voice) - it would serve more as a "wish list". It would reveal what areas the public (not lobbyists) find most worthy of government spending, and it might serve to guide or alter future government spending. Imagine comparing these results with the actual division of spending as it exists-interesting disparities may arise, demanding an explanation. Imagine compliance if preferences matched actual spending!