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when I've done the 2020-2021 tax return , I was asked to pay by end of march 2022 the sum of 2,725.10 ( £1,869.60 TAX OWED + £855.50 ADVANCE PAYMENT for 21/22 tax year) and another advance to be paid by end of June of £855.50. Today 19/04 I've done the 2021-2022 tax return and it seems that I've already overpaid, trough CIS, without taking into consideration the already paid advance payment (£855) and still shows that I have to pay the other advance of £855. My question is: How do I Get the £855 that I've paid in advance and how do I settle the other £855 in debt, since there was no box in the self return form to include tax paid in advance?