"May be relevant ;
My mother is in her 80's.
My partner & myself are in our early 60's"
This is very relevant indeed when it comes to care home fees.
"If we did this, what would happen if my mother later needed to go into a care home and her share of the property was required for the fees ?"
There is a mandatory disregard where a "family member" over the age of 60 or who is disabled is living in the home when the person goes into care and it is the main or only home of that family member.
Typically, this would be a spouse, but it also covers children, siblings (or the spouse or unmarried partner of any of the preceding) and also aunts/uncles nephews/nieces etc.
But there are two important things, you must have been living in the same house prior to your mum going into care and it must be your main or only home.
So, what this means is that the value of the home is not counted at all and will not be taken for care home fees.
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"A )
Pooling our resources and buying a house we could all live in together ( neither my mothers or my partners & my house are big enough to accommodate us all, so we would need to buy a larger, more expensive property)"
Sounds like a reasonable idea.
"How would you legally reflect each person's financial contribution to the property during initial purchase and any payments for improvements ?"
That one is simple. You can write up a legal agreement stating that your mum owns X%, the trust owns Y% and you and DP own Z%. This agreement can also allow for what happens when one party puts more into the property.
If you speak to a solicitor who is experienced in this area then they will be able to do this for you.
"Would myself & partner have to sell up ?"
Do you mean if your mum goes in to care. If you were already living there and it was your main home and you're over 60 then - no.
"What would happen to the share of the property held in trust ?"
It all depends what the will says. If the will says that she has a life interest then it stays as part of the trust until she passes away.
If it says something else, like maybe until she goes into care then the trust will come to an end when she goes into care and the value of the trust passes to the beneficiary (this then becomes a potentially exempt transfer - only important if it's possible that your parents estate may face paying inheritance tax).
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B )
If my mother were to go into care at this point and we sold the house ;
I guess I can bank her share of the proceeds for later care home fees, but what would happen to my share in trust ? Would it come to me ?
If you chose to sell the home at that point (perhaps the care home you want her to go into is beyond what the council will pay for) then yes you would put her share of the home into a bank account.
As to the trust money, it depends what the will says. If the trust ends when she goes in to care then, yes, you get the trust money straight away. If it is a life interest then the money stays with the trust.
Your mum is entitled to any income from the trust (eg interest or dividends) but cannot touch the capital. So it would be up to the trustees of the trust to invest the capital in a mix of investments. Some of these investments would be focused on income to benefit your mum and some would be focused on capital gain to benefit you. You could not touch the capital in the trust until your mum passes away.
Could I use my mothers share of the proceeds and / or the will trust share to invest in a property that myself & my partner would live in, with everyones share / interest somehow legally registered ?
Do you mean after she has gone into care or now? If you are talking now then, yes, you can definitely do that. If you are talking after she has gone into care then probably not.
"What would happen if, as above, she later needed her share of the property to pay care home fees ?"
Given that you are over 60 and would be living with her before she went in to care then the local council would disregard her share of the home and there would be no need to make any payments.
If you chose to use her share of the home to pay privately for a care home then that would be down to you how you pay that. You could sell the house at that point or get a mortgage to cover the amount instead.