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  • RE: Correction to Self Assessment

    Follow-up question: I submitted my Self Assessment on 31 January, but spotted a mistake now and need to amend my filing. This mistake doesn't affect the amount of tax I needed to pay. Will I face a £100 late filing penalty if: a. I amend my filing using Online Self Assessment, within 72 hours of initial submission? b. More than 72 hours has passed, and I contact HMRC to amend my filing?