The document summarizes the top six regulatory issues facing businesses in the summer of 2015 according to Paychex. These issues include increased enforcement of employee classification, minimum wage increases at the state and local level, mandatory paid sick leave in some jurisdictions, proposed expansion of federal overtime rules, implications of the Supreme Court ruling on same-sex marriage for employer benefits, and the potential impact of ongoing litigation and regulations related to the Affordable Care Act. Paychex advises businesses to stay informed about changing regulations and consider steps like reevaluating worker classification and compensation.