No. In fact, the opposite is true. A December 2011 study by the American Enterprise Institute and the Partnership for a New American Economy found that both temporary foreign workers – even unskilled agricultural workers – and immigrants with advanced degrees boost U.S. employment. The study found no evidence that foreign-born workers, including unauthorized workers, hurt U.S. employment. (http://www.renewoureconomy.org/research/report-immigration-and-american-jobs/)
A July 2013 report from the Institute on Taxation and Economic Policy provides state-by-state estimates on the state and local tax contributions of the 11.2 million undocumented immigrants living in the United States. http://www.itep.org/pdf/undocumentedtaxes.pdf
The key findings are:
• Undocumented immigrants currently contribute significantly to state and local taxes, collectively paying an estimated $10.6 billion in 2010 with contributions ranging from less than $2 million in Montana to more than $2.2 billion in California. This means these families are likely paying about 6.4 % on average of their income in state and local taxes.
• Allowing undocumented immigrants to work in the United States legally would increase their state and local tax contributions by an estimated $2 billion a year. Their effective state and local tax rate would also increase to 7 % on average, which would put their tax contributions more in line with documented taxpayers with similar incomes.
We also know that American immigrants –,regardless of status , have a substantial overall positive impact on our economy. According to a report by the Perryman Group, if all unauthorized immigrants were removed from the United States, the country would lose $551.6 billion in economic activity, $245.0 billion in gross domestic product, and approximately 2.8 million jobs, even accounting for adequate market adjustment time.