Data from the IRS Inspector General, the Social Security Administration, and the Congressional Budget Office indicate that roughly half of illegal immigrants file federal tax returns but virtually none of them pay federal income taxes. Instead, they generally file these returns to obtain refundable child tax credits, which are a form of cash welfare. Hillary Clinton and PolitiFact have claimed that half of illegal immigrants "pay federal income tax," but this is actually the portion who file tax returns, not those who pay income taxes.