The Fiscal Cost of Unlawful Immigrants and Amnesty to the U.S. Taxpayer (http://www.heritage.org/research/reports/2013/05/the-fiscal-cost-of-unlawful-immigrants-and-amnesty-to-the-us-taxpayer)
By Robert Rector and Jason Richwine, Ph.D.
May 6, 2013
The typical unlawful immigrant is 34 years old. After amnesty, this individual will receive government benefits, on average, for 50 years. Restricting access to benefits for the first 13 years after amnesty therefore has only a marginal impact on long-term costs.
If amnesty is enacted, the average adult unlawful immigrant would receive $592,000 more in government benefits over the course of his remaining lifetime than he would pay in taxes.
Over a lifetime, the former unlawful immigrants together would receive $9.4 trillion in government benefits and services and pay $3.1 trillion in taxes. They would generate a lifetime fiscal deficit (total benefits minus total taxes) of $6.3 trillion. (All figures are in constant 2010 dollars.) This should be considered a minimum estimate.