I won’t comment on the banking arrangements (!) but presumably you can make a reasonable apportionment of the interest arising based on the relative amounts of personal and trust cash in the account at any time and the prevailing interest rate (of which the bank will have told the account holder - usually as a note on the statements).
I would do a spreadsheet detailing every transaction in the period when the funds were mixed, with separate columns for personal and trust monies and a total running balance. Then apply the interest rate accordingly immediately before each balance change. You should reconcile your calculations of interest to the figures of interest paid by the bank. I see no reason why each party would/should pay tax on the other’s interest.
I would imagine that the terms of the account specifically prohibit its use for anything other than personal funds so if your financial adviser / their platform, or your stockbroker can’t manage the cash (unlikely) I would suggest you open a trust bank account. There are other very good reasons not to mix personal and trust funds /assets. I am assuming you are a lay person as you have presided over these arrangements and are asking this question. If you have not recently taken professional advice on running this trust I would suggest you do so now. I am hoping you have taken professional investment advice but if not then again I would strongly recommend you do so now, from someone who is familiar with investing for trusts.
Beneficiaries can and will go after trustees who have not fulfilled their duties properly. Taking proper trust/financial advice is pretty fundamental to being a trustee and should prove to be in the interests of all parties.
Sara Spencer | Trust Manager
www.trustandestate.co.uk
Sara Spencer Ltd, 8 Kingsway, Harrogate, HG1 5NQ
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Sara.spencer@trustandestate.co.uk
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