CGT on separation of jointly owned property.

My sister and I jointly own two properties, we want to separate them and own one each. Is the CGT due on the transfer of 50% of each property 50% of the increase in value since we inherited the properties?

Hi,
Yes, if they have not been your main residence. See guidance at:
Capital Gains Tax: what you pay it on, rates and allowances
Thank you.

And if each of the properties was the main residence of one of the siblings?

Hi,
As only one property can be a main residence, then a gain will arise on the disposal of the second property.
Thank you.