I have an annual personal allowance of 10k. For the tax year ended April 15 I have submitted my tax return. My employment income was only around half of my allowance so no tax due. I have a few shares and received dividends on them and have some savings and received interest - not much. HMRC calculate I owe tax and am not sure why given that I have over 5k personal allowance unused. Any ideas? I can call HMRC on Monday but wondered if I have misunderstood or overlooked something - I didn't think I would have to pay any tax given that all income from all sources is below 10k
many thanks in advance