Presidential election campaign fund checkoff

The presidential election campaign fund checkoff appears on US income tax return forms as the question "Do you want $3 of your federal tax to go to the Presidential Election Campaign Fund? ". The indicated funds—originally $1 and implemented in 1966 and changed to $3 in 1994—began as a start to public funding of elections to provide for the financing of presidential primary and general-election campaigns, as well as national party conventions.

Source: Wikipedia — Presidential election campaign fund checkoff (CC BY-SA 4.0)