“Where there is no partnership, the share of any profit or loss arising from jointly owned property will normally be the same as the share owned in the property being let. But joint owners can agree a different division of profits and losses and so occasionally the share of the profits or losses will be different from the share in the property. The share for tax purposes must be the same as the share actually agreed.”
“If such a declaration has been made you should treat it as evidence of the existence of an express agreement concerning the ownership of the assets and you should follow that split in assessing the gains on disposal of the asset.”