WASHINGTON, July 13 (Reuters) - The U.S. government posted a larger-than-expected budget surplus in June, propped up by higher quarterly business tax receipts, a government report released on Tuesday showed.

In the Treasury Department's monthly budget statement, June income outpaced spending by $19.14 billion, slightly less than the government's June 2003 surplus of $21.23 billion.

"What we are seeing is the impact of a good economy, the impact of extraordinarily strong corporate profits, and likely the impact of more people being caught in the alternative minimum tax," Drew Matus, financial markets economist at Lehman Brothers in New York, said in response to the report.

"Surprisingly strong receipts are really helping out a great deal here. There is no reason to suspect, given the employment growth we have seen, that this trend will change any time soon," he said.

The June result exceeded Wall Street forecasts of a $16.50 billion surplus, as well as a $16 billion surplus projection from the nonpartisan Congressional Budget Office...