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Hello, just doing my self-assessment and I've had a figure appear in the section Underpaid tax included in PAYE coding (Page 1 of 2), which I've never had before. It's saying "Amount of underpaid tax for earlier years included in your tax code for 6 April 2021 to 5 April 2022 (from your PAYE Notice of Coding)". I've just checked my post and I can't see I've ever previously had a P2 before.
Is there a way of finding them online and seeing what this figure is as it's affecting my self-assessment by quite a bit?