HMRC Admin 21 Response

Hi Ricky,
You will need to convert from Hong Kong Dollars, to pounds sterling, to complete your tax return.  We do not provide an official exchange rate and the onus is on the individual to use a just and reasonable exchange rate for your conversions.  For your convencience, you can find exchange rates at 
(https://webarchive.nationalarchives.gov.uk/ukgwa/20231016190054/https://www.gov.uk/government/collections/exchange-rates-for-customs-and-vat) but you can use the exchange rate from another source.  You would declare the turnover on the self employment section of the tax return and claim the wages paid out, as an expense.  You would also need to declare the turnover and overseas tax deducted, so that you can claim a foreign tax credit, to avoid paying the same tax twice.
Thank you.

Hi Ricky,
Please go through the check if you need to send a tax return tool at Check if you need to send a Self Assessment tax return.  If the tool confirms that a tax return is not required, then you will need to ontact our self assesment helpline on 0300 200 3310 or contact our webchat facility at Contact HMRC, so that they can withdraw the tax return and make your record dormant.
Thank you.