According to the Departmental Interpretation and Application Note No. 39 (DIPN 39) revised by the Hong Kong Inland Revenue Department in March 2020, cryptocurrencies are subject to profits tax.

Tax standard:

50USDT-10000USDT pay 7%
Above 10,000 USDT - 100,000 USDT 12%
Above 100,000 USDT - 13% payable for 1,000,000 USDT
16.5% above 1,000,000

DIPN 39：https://www.ird.gov.hk/eng/pdf/dipn39.pdf

Hong Kong Inland Revenue Departmenthttps://www.ird.gov.hk/chi/welcome.htm