The main service functions of "12366 tax service hotline" include: tax consultation service, which mainly provides taxpayers with tax laws, regulations and policies, tax collection and management regulations, tax-related information and other consulting services; The tax guide service mainly provides consulting services for taxpayers to handle tax registration, invoice purchase, tax declaration and other tax-related matters; The tax-related reporting service mainly provides services for taxpayers to report tax violations; The complaint supervision service mainly provides taxpayers with the service of supervising and complaining about the ethics of tax authorities, service quality and illegal behaviors of tax personnel.