CGT base cost on gifted property

Hi, I own a property 50%. My dad owns the other 50%. Property bought for £100k now worth £200k My dad is gifting me his 50% share - I understand that he will have to pay CGT on this disposal. If I sell the property in 5 years for £250k, I will also have to pay CGT, but how will I calculate my base cost, as I have acquired the first 50% of the property for £50k and the second 50% for £100k, will the base cost be £150k?

Hi,
If this property was your dad's main residence, then he would be able to claim Private Residence Relief to offset any gain. You can see guidance here:
HS283 Private Residence Relief (2024) 
There is also a capital gains tax calculator to help work out if there is a gain here:
Tax when you sell property
As there is a connection between your dad and yourself, he will need to use the market value of the asset to obtain a disposal value for working out his gain. You can see more information here:
CG14530 - Consideration for disposal: market value rule
If you dispose of the property at some point in the future, you would need to work out how much you paid for your 50% and the market value of the 50% gifted by your dad. This will give you, your 100% acquistion cost, which is deducted from the disposal value to work out if there is a gain. Again, Private Residence Relief may apply.
Thank you.