这个报告没有将非法移民单独列出来分析是个很大的问题。因为这才是大选的焦点之一。

On an annual basis, new immigrant families receive more in publicly funded services than they pay in taxes, the panel said. Most -- especially those from Latin America -- tend to have more school-aged children and require more educational services than other households. Although immigrants use about the same level of government services as native-born residents, most immigrants pay less taxes because they own less property and have lower-paying jobs.

The panel's long-term estimates indicate that on a national level, the majority of new immigrants and their descendants will add more to government coffers than they receive over their lifetimes. The positive fiscal effects of immigration at the federal level are shared equally by all residents across the nation. However, residents of a few states such as California -- with high numbers of new immigrants -- will bear long-term costs that are concentrated at the state and local level of government.

Immigrants and their children will bring long-term benefits for most U.S. taxpayers because -- like most Americans -- immigrants use more publicly funded services in childhood and old age, but they make positive contributions as working adults. In addition, the majority of immigrants pay taxes and add revenue for some services -- such as national defense and interest on the federal debt -- for which they do not impose costs.

The long-term fiscal contributions that immigrants make, however, will vary depending on such factors as education and age of arrival to the United States. Immigrants with higher levels of education will pay more taxes in the long term because they have higher incomes. But immigrants who don't have high school educations and those who are age 50 or older on arrival may receive more benefits than they pay in taxes.