Thank you for your question..
You say you have not been a UK resident for tax purposes since 1998.
There have been changes to CGT and residental properties owned by non residents wef 6 Apr 2015.
CGT is now chargeable on gains made by non-residents and this is fully explained here
If you were to sell your property and it was your main residence at one point then you can either calculate the charegable gains using the old basis or
you can calculate your gain using the valuation at 5 Apr 2015 as your base cost (covered under rebasing).
The gain between 5 Apr 2015 and now may not be that high and it may be a better option.
I hope this is helpful and answers your question.
If you have any other questions, please ask me before you rate my service – I’ll be happy to respond.
Thank you for your reply..
It is not as simple as that..
Total exemption applies you if had used the property throughout your period of ownership as your only and main residence. In that case you get private residence relief to cover the gain.
If there are absences then you have to perform some calculations to determine what period is covered by PRR etc. More information on this is covered in HS283 here
If you move into a property with aview of making it your permanent home then as little as 6 months is sufficient but where you move in and out then you have to go through the exercise explained.
I hope this is helpful.
Thank you for your reply.
Lets say your chargeable gain is £17,600 after costs of selling the property and agents fee (these are allowable costs in arriving at the gain).
Gains allowance is £11,100.. CGT payable on £6,500 at 18% is £1,170.
CGT rates can be found here