When you change your computer without backup, you need to go to the tax service hall of the competent tax authority for filing, and open the "withholding client data download function". In this process, the legal representative or financial person in charge of the withholding unit needs to authorize the taxpayer through the personal income tax APP.

After that, use the real-name login method to enter the natural person electronic tax bureau, click "Personnel Information Collection" and download the submitted but not resigned personnel information. After completing the safety verification, check and confirm the accuracy of personnel information. Inquire and download historical declaration data through the "withholding client of natural person electronic tax bureau" to ensure the continuity and accuracy of individual tax declaration. This series of operations aims to ensure the smooth progress of tax declaration and comply with the requirements of relevant laws and regulations.