Tenancy in Common to Joint Tenants

I would be grateful if the following could be clarified please (if you could also provide the HMRC manual source for each answer, that would be great): 1. When two unmarried joint tenants change their form of the co-ownership to tenants in common in unequal shares, do they have to notify HMRC and if so, when? 2. For HMRC purposes, can a property be owned as tenants in common in the proportion of 100 to 0 or does it have to be at least 99 to 1? 3. If during the period when the property is owned as tenants in common in unequal shares following severance from joint tenancy the property was partially let on short term basis (e.g. one room on AirBnB), but maintained the property as their main or only residence throughout that period, would CGT private residence relief apply on a subsequent change from tenants in common in unequal shares to joint tenants? If PRR is reduced, how would it be reduced? 4. In the above scenario, do unmarried joint tenants have to notify HMRC after changing their form of ownership from tenants in common in unequal shares back to joint tenancy, and if so, when? 5. Are there any other tax consequences of changing the form of ownership of the main residence from joint tenants to tenants in common in unequal shares and subsequently from tenants in common to joint tenants? Thank you for your help

Hi ,
 

Please refer to : Joint property ownership   .

Thank you .

Thank you. The source provides helpful information regarding what should be done at the Land Registry, rather than whether anything needs to be filed at the HMRC and when. The source does not really answer the other questions either. It wound be very helpful to get a more detailed answer or comments on this. Thank you for your help.

Hi,
You can elect to split the ownership in an unequal share.  
That can be 100/0 or 99/1 or any other permutation.
Please have a look at the guidance on private residence relief on helpsheet HM283: HS283 Private Residence Relief (2024).
We cannot comment on scenarios. 
Please refer to: Joint property ownership.
Thank you.