Average Exchange Rates of Major Foreign Currencies for Salaries Tax Purposes
https://www.ird.gov.hk/eng/tax/ind_stp.htm
Salaries tax is calculated in Hong Kong dollars. If a taxpayer receives chargeable income or incurs deductible expense in foreign currency, he / she has to report in equivalent amount of the income or expense in Hong Kong dollars in his / her tax return. Here you can find the average exchange rates of major foreign currencies.