Self Assessment What Is Payments On Account - (POA)
As part of your tax bill you may see an amount called a payment on account. This is an amount that you have to pay on account against the tax due in the current year. Often people think that they are having to pay tax in advance but actually tax due for the self employed is paid in arrears; by 31 January following the end of the tax year. So 10 months later. HMRC use the payments on account system to make sure that they have collected at least part of the tax due as you go.