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TAXATION - Income Tax - Applicable Tax Rates (Details) |  |  |  | 9 Months Ended | 12 Months Ended | 24 Months Ended
--- | --- | --- | --- | --- | --- | ---
Apr. 01, 2018 | Dec. 22, 2017 | Dec. 21, 2017 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020
TAXATION |  |  |  |  |  |  |  |  |
Withholding tax rate (as a percent) |  |  |  | 10.00% |  | 10.00% |  |  |
Withholding tax rate applicable to beneficial owner ( as a percent) |  |  |  | 5.00% |  | 5.00% |  |  |
The United States ("US") |  |  |  |  |  |  |  |  |
TAXATION |  |  |  |  |  |  |  |  |
Applicable tax rate (as a percent) |  | 21.00% | 35.00% | 35.00% |  | 35.00% |  |  |
Hong Kong |  |  |  |  |  |  |  |  |
TAXATION |  |  |  |  |  |  |  |  |
Applicable tax rate (as a percent) |  |  |  | 16.50% | 16.50% | 16.50% |  |  |
Hong Kong | Assessable profits on the first HK$2 million |  |  |  |  |  |  |  |  |
TAXATION |  |  |  |  |  |  |  |  |
Applicable tax rate (as a percent) | 8.25% |  |  |  |  |  |  |  |
Hong Kong | Assessable profits in excess of HK$2 million |  |  |  |  |  |  |  |  |
TAXATION |  |  |  |  |  |  |  |  |
Applicable tax rate (as a percent) | 16.50% |  |  |  |  |  |  |  |
China |  |  |  |  |  |  |  |  |
TAXATION |  |  |  |  |  |  |  |  |
Applicable tax rate (as a percent) |  |  |  | 25.00% |  | 25.00% |  |  |
Preferential tax rate (as a percent) |  |  |  | 15.00% |  | 15.00% |  |  |
Super deduction of research and development expenses (as a percent) |  |  |  | 175.00% |  | 175.00% |  |  |
China | Futu Network Technology (Shenzhen) Co., Ltd |  |  |  |  |  |  |  |  |
TAXATION |  |  |  |  |  |  |  |  |
Preferential tax rate (as a percent) |  |  |  |  |  |  | 15.00% | 15.00% | 15.00%
Preferential tax rate, valid period |  |  |  |  |  |  | 3 years | 3 years |
SINGAPORE |  |  |  |  |  |  |  |  |
TAXATION |  |  |  |  |  |  |  |  |
Applicable tax rate (as a percent) |  |  |  | 17.00% |  | 17.00% |  |  |

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