Hello and welcome to the site. Thank you for your question.
Please confirm this is a second home/investment as far as your financial affairs are concerned.
I am basing my calculations on the assumption this is your second home and also that the sale takes place in tax year 2014-15.
Your share of profit after costs = £22,500
Gains allowance = £11,000
Gain chargeable to CGT (22,500-11,000) = £11,500.
This chargeable gain would be added to your total income to see if it is within basic rate band i.e £41,865.
If so, then your CGT would be (11,500 x 18%) = £2,070.
In the event your total income is in excess of £41,865 including the chargeable gain, the excess would be charged at 28%
as an example
Total income after personal allowance and before gain = 25,000
CGT at 18% on (31,865-25,000) = 6,865 x 18% = £1,235.70
CGT at 28% on (11,500-6,865) = 4,635 x 28% = £1,297.80
Total CGT (1,235.70+1,297.80) = £2,533.50
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.