Telling HMRC to split Interest from a Joint Savings Account other than 50/50?

MKPhil

After my Mum died a few years ago, my Dad added me as a Joint Account Holder to his Current Account and Savings, the idea being that should he become unable to manage his finances or pass away I would be easily able to help, e.g. buying groceries, paying bills etc. (yes, I know there are other ways to do this but this was the easiest/best at the time - lets not get in to that here).  We have a verbal agreement that this money is totally his - its the proceeds from his house-sale and (what little) he saves from his pension.  I cannot draw on it for any reason except as detailed above.

Now, with all the interest rate rises we've had on the Joint Savings Account and others I hold I will exceed my Personal Savings Allowance for this year (assuming a 50/50 split on the joint account).

Is there a way to tell HMRC that this particular Joint Savings Account is 100% my Dad's money (and therefore they won't count it towards my Personal Savings Allowance) and not split 50/50?

Keep_pedalling

Married couples can do it using form 17, but as far as I know there is no way of doing it for joint holders who are not married or in a civil partnership.

I know you don’t want to here it, but getting a financial LPA in place should be a priority.

Jeremy535897

See https://www.gov.uk/hmrc-internal-manuals/savings-and-investment-manual/saim2420

I would suggest that you explain in the white space on the tax return why you regard all of the interest as belonging to your father, and reference the text in the link above:
"Where there is no, or insufficient evidence, to show that the account holders intended the funds in the account to be held in joint ownership or in specified shares, the parties will be taxed according to the share of funds that each has respectively contributed."