Neill100 . . . When you pay your tax bill you now pay 50% of your tax bill in advance for the next tax year. Its known as tax paid on account. But the online form asks you this question.
Absolutely! but that 50% paid on account is based on your last years figures, if you then earn above that then the figure has been underpaid. I assumed the tax system - which we pay for, would have made this adjustment automatically with the figures supplied.
As I said if the returns had been made by a paper return then those figures would have been adjusted and advised accordingly but they dont if you do it online - you have to make that adjustment yourself!