Expanding Access to Capital for Entrepreneurial Leaders Act or the EXCEL Act - Amends the Small Business Investment Act of 1958 to authorize the Administrator of the Small Business Administration (SBA) to guarantee the payment of up to $4 billion per fiscal year for debentures or participating securities issued by small business investment companies (SBICs) to encourage the formation and growth of small businesses. Increases from $225 million to $350 million the maximum amount of outstanding leverage for two or more commonly-controlled SBICs.