The Fiscal Cost of Unlawful Immigrants and Amnesty to the U.S. Taxpayer

Executive Summary

Unlawful immigration and amnesty for current unlawful immigrants can pose large fiscal costs for U.S. taxpayers. Government provides four types of benefits and services that are relevant to this issue:

• Direct benefits. These include Social Security, Medicare, unemployment insurance, and workers’ compensation.
• Means-tested welfare benefits. There are over 80 of these programs which, at a cost of nearly $900 billion per year, provide cash, food, housing, medical, and other services to roughly 100 million low-income Americans. Major programs include Medicaid, food stamps, the refundable Earned Income Tax Credit, public housing, Supplemental Security Income, and Temporary Assistance for Needy Families.
• Public education. At a cost of $12,300 per pupil per year, these services are largely free or heavily subsidized for low-income parents.
• Population-based services. Police, fire, highways, parks, and similar services, as the National Academy of Sciences determined in its study of the fiscal costs of immigration, generally have to expand as new immigrants enter a community; someone has to bear the cost of that expansion. 

http://www.heritage.org/research/reports/2013/05/the-fiscal-cost-of-unlawful-immigrants-and-amnesty%20to-the-us-taxpayer