Matching funds or public funding
Public money can be given to presidential candidates who agree to limit their spending on the campaign. Contributions from individuals in which the aggregate amount contributed by the individual is $250 or less are eligible to be matched on a dollar- for-dollar basis from the Presidential Election Campaign Fund. This fund includes proceeds from the voluntary check-off of $3 per person from income tax returns of eligible taxpayers. See also Taxpayer check-off system. Read more about Matching funds or public funding