Hi,
For your first question we refer you to
TSEM9851 which states the following- ‘Where married couples or civil partners elect not to be taxed 50/50, the normal rules of beneficial ownership apply.
The starting point is that the jointly held property is presumed to be held as joint tenants (
TSEM9230).
As
TSEM9230 says, there are various ways this presumption can be displaced by evidence to the contrary - for example, a valid declaration of trust in equal or unequal shares. However, if the shares are equal there would be no possibility of a joint declaration on form 17 for tax purposes, so only a declaration in respect of unequal shares would be correct.’
In regards to your second question- most types of trusts giving an interest in property to somebody who is not the legal owner now need to be registered with HMRC via the Trust Registration Service.
You can find guidance on the registration requirements and how to register here:
Register a trust as a trustee.
There’s also more information about what type of trusts need to be registered at:
TRSM23050.
Thank you.