1. Log in to official website, Jiangsu Provincial State Electronic Taxation Bureau and enter the "Tax Service" page.
2. Select "personal income tax" or "enterprise income tax" in the page, and select the corresponding service items according to the specific situation.
3. After entering the related service page, find options such as "declaration and payment" or "tax preference" in the navigation bar on the left side of the page, find options such as "periodic quota declaration" or "audit collection", and click Enter.
4. Enter the taxpayer's ID number or other information in the relevant page, and the system will return relevant query results, including whether the taxpayer belongs to a regular fixed taxpayer or a taxpayer within the scope of audit collection.