If it is a small-scale taxpayer, there are two ways to collect taxes. One is to collect taxes through auditing, and the tax rate is 3%. The other is fixed tax, which is determined by the tax collector according to the operation of similar local enterprises. It is stipulated in the tax law that self-employed individuals or enterprises with imperfect financial systems can give a basic turnover and pay taxes according to the approved turnover every month. As for the approved standards, there are different places, but it is known that the national tax is calculated according to the formula. If the invoice exceeds the monthly quota, the excess must be taxed. Generally speaking, self-declaration is generally aimed at those enterprises with certain economic ability and standardized account establishment. Self-employed people can usually only give quotas. If you want to cancel the quota and declare it yourself, you can consult the local tax authorities.