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  • Can't change self-assessment submission

    Hi, I recently had to submit 3 years of self assessment forms for the first time. I made an error on the 2021 submission but there is no option to change it where it says their should be - I can only change the most recent 2023 submission. I tried calling but after holding for an hour was cut off by the HMRC person! Can anyone advise how best to do this? Thanks