I have been doing self assessment forms for my parents for the 1st time, they have very simple incomes, state pension, private pension and interest from savings and a tiny amount of shares in non isa holdings.
They are both well within the 20% income tax band.
The reason for the self assessment form is a one off chargeable event as they cashed in a life insurance policy which they held 50 50 and profits are treated as tax paid.
I completed Mums tax return and that said 0 tax owed. When I did dads it says he owes £231 in tax, I think this is because mum only had an income of around 10K and they benefited from the transfer of a portion of her tax band to dad under the marriage tax allowance.
This is the only thing I can think this £231 can be, Dad pension is a final salary scheme paid by his ex company and, savings interest was £91, all his other money is in ISA. He did go £10 over the £1K dividends allowance, but he says the tax has been paid on that.
Therefore presuming it is the difference on the married tax allowance, does this get taken off somewhere in the background and corrected after submission, there is no place I can see on the online form to reference it, not would I know how to calculate if the £231 is for that, but it is the only obvious thing as their finance is so simple.