H-1B visa IT workers earn on average $13,000 less than their American counterparts, according to a study of U.S. Department of Labor records released by the Center for Immigration Studies.H-1B workers are paid less, even though the law requires that they receive prevailing wages, according to the study by John Miano, a former chairman of the Programmers Guild, a group that has been critical of the H-1B program.Miano\u2019s report compares wage data that employers file with the Labor Department against U.S. wage data collected by the Bureau of Labor Statistics. While employers must attest that they will pay prevailing wages on a form called the Labor Condition Application, Miano says in the report that agency officials haven\u2019t been required to verify that data.Meanwhile, employers can use their own salary surveys for entry-level workers to justify paying lower wages, \u201crather than more relevant and objective data sources, to make prevailing wage claims when hiring H-1B workers,\u201d wrote Miano.One result is lower wages for H-1B workers. For instance, the study found a mean 2003 wage for H-1B programmers of $49,258. Labor Department data pegged the mean 2003 wage salary for U.S. programmers at $65,000.Recommendations for improving the wage disparity, which can put downward pressure on the rates paid to U.S. workers, include limiting the number of H-1B visas that an employer can obtain each year based on the number of U.S. employees at each company, as well as requiring companies to use a \u201cstandard wage source\u201d produced by the federal government when making prevailing-wage claims.The report also suggests that the ability of H-1B workers to seek better wages from other employers be limited. The H-1B visa has a six-year limit but allows the foreign worker to apply for permanent residency. While visa holders can change jobs, Miano says a worker who changes employers is unlikely to get permanent residency.The 65,000 H-1B cap for the 2006 federal fiscal year that began in October was reached last year. A proposal to hike that cap this year by 30,000, which was included in the Deficit Reduction Omnibus Reconciliation Act of 2005, failed to win House approval last month.Congress is allowing an additional 20,000 H-1B visas to foreign students graduating from U.S. schools with advanced degrees, but that cap is very close to being reached, according to the U.S. Citizenship and Immigration Service. As of Dec. 27, 18,636 visas had either been issued or were pending.