During the internship, I went to the tax bureau to file tax returns. If the company's contact person changed to my own, but did not change after leaving the company, I should report the change of tax registration to the original tax registration authority with relevant documents within 30 days from the date of personnel change. According to the relevant public information, if the contents of tax registration of taxpayers engaged in production and business operations change, they shall report to the tax authorities for change or cancellation of tax registration with relevant documents within 30 days from the date when the administrative department for industry and commerce handles the change registration or before applying to the administrative department for industry and commerce for cancellation of registration.