Hi,
Yes. If you were resident in the UK in the tax year in which you disposed of this property, then you need to report the disposal on a self assessment tax return, for capital gains purposes.
To work out if there is UK capital gains tax to pay on this disposal, requires that you obtain the acquisition cost and expenses, such as solicitors fees, estate agent fees incurred at the time and convert this to pounds sterling, using a just and reasonable exchange rate for the date you acquired the property.
You also need to do this with the disposal value and disposal costs.
You deduct the acquisition cost, expenses and disposal exepenses from the disposal value, to work out the gain.
If this property was your main residence for part of the ownership period, you may be entitiled to claim private residence relief.
Have a look at the guidance at:
HS283 Private Residence Relief (2023).
There is no tax relief available regarding the strength or weakness of exchange rates at different times.
Thank you.