Hi I have 2 daughters who have some bare trusts that their grandparents are putting cash into. They need to register for self assessment since they are making capital gains (albeit below threshold). I therefore need to register them. Form SA1 allows me to register them if they don't have an NI number (which obviously they don't) but the form requires the person named in the form to be above 15 years and 9 months. Therefore should I fill out that form as "me" - but then won't "I" get the self assessment form Or should I fill out the form as "them" - but then what do I put into that date of birth box? Help please!