Closing the Credit Gap Act This bill establishes a Community Advantage Loan Program under which the Small Business Administration (SBA) may guarantee loans made by covered institutions to small business concerns in underserved markets. Specifically, the bill makes the Community Advantage Pilot Program (CA) permanent and includes women and minorities as eligible groups for CA loans in addition to the other categories that are currently eligible. The bill requires at least 60% of loans made by a covered institution under the program be made to small business concerns in underserved markets, and it allows the SBA to waive the $250,000 cap on loan sizes up to $350,000. The bill further requires the SBA to provide both in-person and online training and technical assistance that is free or low-cost for covered institutions making loans under the program. The SBA must establish a working group to develop recommendations for the SBA to effectively manage, support, and promote the program and its mission. Lastly, the bill requires the Government Accountability Office to report on program outcomes.