https://www.vox.com/2018/4/13/17229018/undocumented-immigrants-pay-taxes
The best estimates come from research by the Institute of Taxation and Economic Policy, a Washington, DC, think tank, which suggests that about half of undocumented workers in the United States file income tax returns. The most recent IRS data, from 2015, shows that the agency received 4.4 million income tax returns from workers who don’t have Social Security numbers, which includes a large number of undocumented immigrants. That year, they paid $23.6 billion in income taxes
