WASHINGTON — The nation’s top business and labor groups have reached an agreement on a guest worker program for low-skilled immigrants, a person with knowledge of the negotiations said on Saturday. The deal clears the path for broad immigration legislation to be introduced when Congress returns from its two-week recess in mid-April.

Senator Charles E. Schumer, Democrat of New York, convened a conference call on Friday night with Thomas J. Donohue, the president of the U.S. Chamber of Commerce, and Richard L. Trumka, the president of the A.F.L.-C.I.O., the nation’s main federation of labor unions, in which they agreed in principle on a guest worker program for low-skilled, year-round temporary workers. Mr. Schumer is one of eight senators from both parties who have been negotiating an overhaul of the nation’s immigration laws.

Pay for guest workers was the last major sticking point on a broad immigration package, and one that had stalled the eight senators just before the break. The eight senators still need to sign off on the agreement between the business and labor groups, the person with knowledge of the talks said.

“This issue has always been the deal breaker on immigration reform, but not this time,” Mr. Schumer said.