One year. General taxpayers refer to taxpayers whose annual sales of value-added tax (hereinafter referred to as annual taxable sales, including all taxable sales in a calendar year) exceed the standard of small-scale taxpayers stipulated by the competent departments of finance and taxation of the State Council. Under normal circumstances, taxpayers need to re-apply for electronic signature within one year. Electronic signature is a form of electronic signature. Image processing technology is used to transform the electronic signature operation into the same visual effect as the stamping operation of paper documents, and electronic signature technology is used to ensure the authenticity and integrity of electronic information and the non-repudiation of signers.