Discounted Value of Jointly Owned Property for CGT

Tax Planning and Financial

I am looking to dispose of a property I own to my company (owned by me and my daughter). This will, unfortunately, incur both a CGT and SDLT liability. I have looked at alternative structures which are more tax efficient - eg: gifting the property to a family member to avoid SDLT but none work for me for other reasons.

I have had the property RICS valued and am currently carrying out draft CGT calculations to see how much of the property I can afford to transfer taking into account the total tax cost of the transaction.

As the whole property will not be transferred, I have seen reference to discounting the value (i.e FMV x % disposed of) to take account of joint ownership. I have seen examples of a 10% and 15% discount but no tangible number in any HMRC guidance or legislation. My accountants are looking into it but seem unsure. My RICS surveyor says it's an accounting issue and that he has never given a discounted value for a part-value of a property.

Can anyone help? I need to get this sorted by Wendnesday 5 April.

Many thanks