Hi Joe Romeo,
As a UK resident, disposing of an overseas property, you are required to report the disposal in a Self Assessment tax return.
The date of completion of the disposal, is used to determine the tax year it is reported in.
If the completion date is on or after 6 April 2023 to 5 April 2024, it would be declared in your 2023 to 2024 tax return after 6 April 2024.
You would need to convert all the figures to pounds sterling, to include on your tax return.
The exchange rate is not set in stone, which is why you have a choice.
Under the terms of Self Assessment, we do not provide an official exchange rate and the onus is on the individual to use a just and reasonable exchange rate for each acquisition and disposal.
For your convenience, there is a choice of exchange rates here:
Exchange rates from HMRC in CSV and XML format
Or from another source, such as the stock exchange
There is a calculator in that should help you work out your gain:
Tax when you sell your home