PD, based on 2002 Census Bureau studies, illegal immigrants currently cost the country $10 billion more in services than they pay into the system.
A new study from the Center for Immigration Studies is one of the first to estimate the impact of illegal immigration on the federal budget. Based on Census Bureau data, the study estimates that households headed by illegal aliens used $10 billion more in government services than they paid in taxes in 2002. These figures are only for the federal government; costs at the state and local level are also likely to be significant. The study also finds that if illegals were given amnesty, the fiscal deficit at the federal level would grow to nearly $29 billion.
http://freerepublic.com/focus/f-news/1609318/posts
Keep in mind. This is an advocacy group. Anything it says should be carefully examined the same way anything said by Answer "Center for Peace and Justice" or the DNC would be. They are making a case, maybe they are right, but there are a lot of holes in their assumptions. This is old Washington DC tactic. Create an innocuous sounding group, throw out a "Study" and start generating factoids. Usually the Left does this. Curious how many of the Leftist tactics our side has suddenly adopted since 2004. Curious who is paying for this group.