Hi,
How you financed the acquisition of the asset, whether by mortgage, cash payment, inheritance or a combination of different methods is errelevant. How you acquired the asset is not a factor in calculating capital gains on the disposal of residential property. The calculation is the disposal value minus allowable costs to determine if their is a gain or a loss. Allowable costs are the acquisition cost, solicitor's fees, estate angent's fees, auctioneer's feed, stamp duty, disposal costs etc.
There is a calculator below, which you can use to work out if you have a gain or a loss.
Tax when you sell property
Gains should be reported within 60 days of the completion date.
Guidance on this is at the end of the calculator.
Thank you.