mthiselton

Hi I have come to this forum for the same reason - to try and find out why 18 month's of tax payments are due in January. Please can there be a better explanation than the factual ones eg "An underpayment of more than £1000 and less than 80% of the underpayment can be collected automatically". I don't understand why I am catching something up. Have I been paying in arrears for years? Why two years' of payments in one year? Thank you for any clear guidance.