Levent Aksu

Hi, I have filled my 2023-2024 tax-return online through self-assessment. This is the 2nd time I have filled a tax return in this country so I am still not feeling solid about some of the concepts and scared to death to make a mistake which would cost me later as an unexpected expense. After submitting my return the system calculated me some substantial amount of overpaid tax. This sounds reasonable because I have experienced a dismissal followed by a non-working period. Anyway, I applied for collecting the overpayment but it has not happened for a long while. I have waited for the time they stated to ask for an explanation and finally got an adviser on online chat. She said there looked some extra payment from the employment that ended with dismissal. Long story short, I was able to figure out what was wrong in there. Because of a dismissal I have received a P45 right after leaving them. After P45, when the quarter finished, I received some extra payment because of the quarterly bonus. This arrived with a payslip and is taxed. When filling my return I have put the amount from the P45 and never realised the later payment was not in it. The adviser said: - well if you amend your return to correct the figure and include the underpayment in the return where it asks for any underpayments included in 23/24 tax code them you should be able to try and claim again it takes 72 hours to update Me: is it termed as "any underpayment"s section ? - yes it will be near the end when it asks for bank details the underpayment is what you need and it And she hanged up. I need to amend my return but I cannot figure out where the "underpayments" near bank details are. It gives me options to amend an income and/or amend sections but I could not exactly say where I should add this extra payment. Thanks.