From a Congressional Budget Office study:

CBO and JCT estimate that enacting this legislation would:
• Increase federal direct spending by $10 billion over the 2008-2012 period and by
$23 billion over the 2008-2017 period. Most of those outlays would be for refundable
income tax credits and Medicaid.
• Increase federal revenues by $15 billion over the 2008-2012 period and by $48 billion
over the 2008-2017 period. That increase would stem largely from greater receipts
of Social Security payroll taxes, which are classified as off-budget.
2
• Lead to an increase in discretionary spending (that is, spending subject to annual
appropriation action) of $20 billion over the 2008-2012 period and $43 billion over
the 2008-2017 period, assuming appropriation of the amounts authorized or otherwise
needed to implement the legislation.