Example: a 2024/25 return due 31 January 2026 can be amended until 31 January 2027, after waiting three days from the original submission.
After 12 months, write to HMRC with the tax year, the correction, an explanation of over/underpaid tax, and your signature.
QuickTaxFiler lets you start an amended return even if you originally filed elsewhere.
QuickTaxFiler helps you complete Self Assessment and supplementary forms. If you have questions, use chat or email support@quicktaxfiler.co.uk.
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