Supermarket Tax Credit for Underserved Areas Act This bill expands the tax credits that are available for the establishment of supermarkets in underserved areas. The bill includes provisions that (1) increase the rate of the rehabilitation tax credit for a supermarket building placed in service after December 31, 2021, and before January 1, 2025, in an underserved area; (2) increase by $1,000 the limit on wages eligible for the work opportunity tax credit for employees of a new underserved area supermarket; and (3) allow a business-related tax credit for 15% of the gross receipts from the retail sale of fresh fruits and vegetables in a new underserved area supermarket.