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  • Self Assessment unpaid tax question

    I am taxed at source by my company but have had a calculation appear saying I owe £3.5k in unpaid tax. As far as I can tell my tax codes are correct. I did (luckily) have a bigger than normal bonus (was backpaid from 2020) which took my earnings higher than usual. I also didn't return my previous year's assessment in time to have Child Benefit taken out of my tax, so I am aware I will owe that back. But that doesn't account for the £3.5k. Does anyone know why this may have happened? The only thing I can think of is my personal allowance would reduce by £1 for every £2 over the threshold. But shouldn't that be handled by PAYE deductions? Thanks in advance.