Congressional Budget Office Cost Estimate: H.R. 133: A Bill to Reduce Federal Spending and the Deficit by Terminating Taxpayer Financing of Presidential Election Campaigns [open pdf - 22KB]
"H.R. 133 would amend federal law to eliminate the Presidential Election Campaign Fund (PECF). Specifically, the bill would:  End taxpayers' option to designate a portion of their federal income tax to be credited to the PECF;  Eliminate the authority to spend balances in the PECF on Presidential campaigns; and  Transfer a portion of the remaining balances in the PECF to the 10-Year Pediatric Research Initiative Fund (PRIF) and the remainder to the general fund of the Treasury. CBO [Congressional Budget Office] estimates that implementing H.R. 133 would have a discretionary cost of $63 million over the 2017-2022 period, assuming that amounts specified to be transferred to the PRIF are appropriated. In addition, we estimate that enacting H.R. 133 would reduce direct spending by $4 million over the 2017-2027 period, by ending the authority to spend federal funds on Presidential campaigns. Because enacting the bill would affect direct spending, pay-as-you-go procedures apply. Enacting the bill would not affect revenues."
Congressional Budget Office: http://www.cbo.gov/