Schultz will testify on March 29 before the Senate Health, Education, Labor and Pensions Committee, the company and panel chairman Senator Bernie Sanders said on Tuesday.
Schultz, who is stepping down from his post this month, had earlier declined an invitation from 11 senators to testify before the panel on March 9.
The company previously rebuffed requests by Sanders for him to appear, instead offering for other executives to testify.
"I look forward to hearing from him as to when he intends to end his illegal anti-union activities and begin signing fair first contracts with the unions," Sanders wrote on Twitter.
Employees at more than 280 out of its roughly 9,000 company-operated U.S. locations have voted to join a labor union since 2021.