One year. According to the inquiry of China Bank official website, it is known that the tax loan period of Bank of China in Yunfu City, Guangdong Province is the longest one year, and the annualized interest rate is no more than 4.35%. According to the regulations, it cannot be used after one year. Tax loan refers to the data that the bank pays taxes due to production and operation in the tax bureau according to the legal entity, so as to give a certain loan amount to the legal entity applying for tax loan.