Yes Customers who declare abnormal tax numbers and attract the attention of the tax bureau are easy to be investigated by the tax bureau: old tax numbers over 3 years are easy to be spot-checked by the tax bureau. Tax declaration refers to the activities of an enterprise to declare the tax payable to the state according to the requirements of the tax law through the network in the course of a month or a quarter, which is divided into the declaration system of the State Taxation Bureau and the declaration system of the Local Taxation Bureau.