My student son earned about £3500 in the 2022-23 tax year, across 2 casual jobs. One of the employers mistakenly deducted about £45 income tax from his first payment. We have been trying to follow HMRC instructions for claiming it back, but when he logs into his Personal Tax Account it says he has paid the correct amount. I don't think this is correct, so he is planning to phone the helpline tomorrow. In the meantime, I'm wondering if the overpayment might simply be too small for them to automatically refund it. Does anyone have experience of claiming back small overpayments?