As confirmed by Inland Revenue Department, the foreign currency denominated consideration of a transaction should be converted into HK dollar before applying the stamp duty rate. The stamp duty derived therefrom should then be rounded up to the nearest HK$1.
Example: a transaction of RMB10,000
Consideration =HK$11,710 (RMB10,000 @ exchange rate of 1.171)
Stamp duty @0.1% =HK$11.71
Stamp duty payable =HK$12.00 (rounded up to the nearest HK$1)