legal ground
Article 2 of the Provisional Regulations of People's Republic of China (PRC) Municipality on Stamp Duty
The following vouchers are taxable vouchers:
(a) purchase and sale, processing contracts, construction contracts, property leasing, cargo transportation, warehousing, loans, property insurance, technology contracts or documents of a contractual nature;
(2) Transfer of property rights;
(3) Business account books;
(4) Rights and licenses;
(5) Other tax vouchers determined by the Ministry of Finance.