"Illegal immigrants are a significant net fiscal drain -- paying less in taxes than they use in public services. The primary reason they create more in costs than they pay in taxes is their relative low levels of education. Based on prior research, 69 percent of adult illegal immigrants have no education beyond high school, compared to 35 percent of the U.S.-born. As a result, they tend to earn modest wages and make modest tax contributions even when income and payroll taxes are taken out of their pay. This fact, coupled with the relatively heavy demands they make on public coffers -- especially for education, health care, and means-tested programs -- is the reason they are a net fiscal drain."