Illegal. The so-called tax avoidance means that taxpayers pay taxes at least and make maximum use of loopholes in the tax law to pay taxes less or not, which is illegal and needs to bear certain criminal responsibilities. According to the provisions of China's criminal law, taxpayers who make false tax returns or fail to declare by means of deception or concealment, and evade paying taxes in a large amount, accounting for more than 10% of the taxable amount, shall be sentenced to fixed-term imprisonment of not more than three years or criminal detention.