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Immigration Project A Project of the University of Arizona’s Udall Center for Studies in Public PolicyThe Udall Center for Studies in Public Policy,
below excerpted 2007' policy study;

At the University of Arizona, if you looked at the full balance sheet to see what ( illegal ) immigrants put into the economy and what they take out. In particular they studied the impact of immigrants, mostly illegal, on the economic conditions in Arizona.

On a whole they found ( illegal ) immigrants contributed more to the economy then they cost. No surprise there. Where the supporters of SB 1070 concentrate on only cost, this study also considered benefits. For instance, “non-citizen households” in Arizona had consumer spending, in 2004, of $4.41 billion. That created an estimated 28,000 full-time jobs. In addition that spending “generated tax revenues of approximately $318.6 million.

But then these illegals “steal jobs” as well. Supposedly “skilled” jobs according to pro SB 1070 pundits. The Udall Center found that 14 percent of the Arizona workforce is made up of immigrants but they held a disproportionate number of “low-skilled” positions in agriculture, construction, manufacturing and some areas of the service industry. Almost 60 percent of agricultural workers were immigrants. About 22 percent of food preparers and servers were immigrants. About 35 to 41 percent of construction workers were immigrants. The same for 46 percent of textile workers, 51 percent of landscaping workers and 38 percent of maintenance workers.

Working illegal immigrates contributes to the economy of the state ( Arizona ) and the Udall Center found:

Non-citizens, for their part, contributed $28.9 billion, or eight percent of Arizona’s economic output, resulting in 278,000 full-time equivalent jobs. Their output included $10 billion in labor income, and $3.3 billion in other property income. The state tax revenues resulting from this economic activity were approximately $1.08 billion.

The study concluded that the state of Arizona took in tax revenue of $1.64 billion from ( illegal ) immigrant workers while the amount the state spent on immigrants was approximately $1.41 billion leaving a net benefit of $222.6 million to the state coffers. But that is only what they contribute to Arizona’s revenue. They also pay national income taxes and social security taxes.
The Udall Center study addresses the case of 'false Social Security numbers -What's more, aliens ( illegals ) who are not self-employed have Social Security and Medicare taxes automatically withheld from their paychecks. Since undocumented workers have only fake numbers, they'll never be able to collect the benefits these taxes are meant to pay for. Last year, the revenues from these fake numbers — that the Social Security administration stashes in the “earnings suspense file” — added up to 10 percent of the Social Security surplus. The file is growing, on average, by more than $50 billion a year.