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When did your parents vacate the property?
This was a gift with reservation so the Capital Gains Tax (CGT) only runs from, in this case, January 2020. Thus only some 1 / 17 = say 6% on any notional gain made is exposed to the tax. In any event you have a non cumulative Annual Exempt Amount (AEA) of 12.3K to offset gains so any liability will me minimal.
I don't do telephone calls any more, they are no longer cost effective.
What system are you using?
Are you sure you have entered data correctly?
Private residence relief from the time you actually acquired the dwellig.
Correct, but I have a shrewd suspicion that this system was never designed to operate this sort of complexity.
And presumably fails to mention that for the last 9 months of ownership you are deemed to be in occupation even if tis is not the case. However, if it is giving you a no liability than accept the position and emulate Brer Fox, 'For he law low and say nuffin!'
Your local high street account could do it in aa moment.