CGT on sale of my property that has been empty for 16 years while I have been working abroad

In 2007 my mother died and left the family home (which we moved into in 1963) to my sister and myself. I had been living in the family home until I moved abroad to work in 1994. Since my mother died and up to this day we have not rented out the house and I have used it as a base to stay there when visiting London (approximately 50 days a year). Other points: 1. We obtained probate in 2007. 2. I was born in the UK hold a UK passport but am currently a resident of Belgium. 3. My sister is a resident of France. 4. The family home I inherited from my mother is the only property I own (worldwide) and is fully furnished. 5. I am retired and receive a UK Government pension and a private UK pension. The only other source of income I receive is dividend payments from UK shares I own. My questions are as follows. Q1: We have put the house up for sale. Will I have to pay CGT on any profit ? If so, how do we work out CGT. Is it 18% of difference between money received from sale and value of property on probate form. if this is the case what else can we offset the CGT against such as Council Tax which is at a 300% premium (four times the standard rate as the property has been deemed to be empty for more that 10 years. Q2: If I own CGT when selling my house can I offset that against a loss of selling UK shares that I own (shares purchased in 2008) bearing in mind that I am currently a resident of Belgium Thank you for any help regarding this matter. Nicholas Ashley

Hi.
It is likely that CGT is due. You can see guidance here:
Capital Gains Tax: what you pay it on, rates and allowances
For allowable expenses in relation to any gain, please refer to the guidance here:
CG15250 - Expenditure: incidental costs of acquisition and disposal 
If you now sell shares at a loss, this can be set against any capital gain but this would need to be done prior to the house sale. If not, you will need to wait until after 6 April 2025 to make a full return submission for any amendment.
Thank you.