Once the correct HS code is identified*, the relevant custom duty rate can be found on the effective Customs Import and Export Tariff of the People’s Republic of China: http://app.gjzwfw.gov.cn/jmopen/webapp/html5/jckspslPC/index.html. Every year in December, the Chinese General Administration of Customs and the State Council publish annual plans of temporary duty rates for certain goods. The latest plan for 2023 is available at: https://www.gov.cn/zhengce/zhengceku/2023-01/02/content_5734605.htm.
* Note: HS codes in China may differ in their 7th to 10th digits, from those used for other countries. The competent Chinese customs will have the final say on the HS classification.