Washington businessman pleaded guilty here yesterday to charges of illegally collecting approximately $4,000 in unemployment compensation checks while he was actually earning a salary of approximately $40,000 a year.

Maurice W. McIntosh, 36, of 839 Decatur St. NW, entered the plea before U.S. District Court Judge June L. Green. He will be sentenced later.

McIntosh, who currently owns and operates M&M Auto Brokers, was formerly the president of Wilson-McIntosh Buick-Opel, Larry Brown's Restaurant, and a northwest Washington liquor store, according to police.

Federal investigators have been proboing for several months the use of more than $590,000 in various government loans to the car dealership and the liquor store. Both companies are now defunct and the loans are in default.

McIntosh's guilty plea to one charge of making a false claim against the U.S. government exposes him to a possible maximum prison term of five years and a fine of up to $10,000.

Metropolitan Police Lt. Louis Blancato and Det. David Brown said their investigation showed that between December, 1975, and July, 1976, McIntosh received $4,000 in unemployment at the same time he was earning income approximately $40,000 a year.