Amending a mistake on your tax return
Mistakes happen to everyone, and your tax return is no exception. Fortunately, you can usually put things right quickly. However, you must act promptly to avoid overpaying tax or missing a possible refund. Below, we explain exactly how the process works.
What to do first
Firstly, do not panic if you spot an error. Instead, review your return carefully and confirm the mistake. Then, gather any supporting figures you may need. Consequently, you will feel far more confident before making changes.
Amending within 12 months
In most cases, you can amend your return within 12 months of the self-assessment filing deadline. Moreover, you can make the change online or by submitting a revised paper return. For example, you can usually amend your 2024-25 return up to 31 January 2027.
Furthermore, online amendments update your tax calculation immediately. As a result, you will quickly see whether you owe more tax or qualify for a repayment. In addition, any changes may affect your payments on account.
After the 12-month deadline
Sometimes, the 12-month window has already closed. In that case, you must contact HMRC in writing instead. This applies in two main situations:
- You need to report income missed from your original return.
- You believe you have overpaid and want to claim overpayment relief.
Claiming overpayment relief
Generally, you can claim overpayment relief up to four years after the relevant tax year ends. However, you must follow a few clear steps. Therefore, when amending a mistake on your tax return, always:
- Explain why you believe the tax has been overpaid.
- Provide full details of the amount involved.
- Confirm that your information is correct and complete.
Why prompt action matters
Ultimately, acting quickly protects you from unnecessary stress and cost. Moreover, timely corrections keep your records accurate and HMRC satisfied. Therefore, never delay once you notice a problem.
Here to help
Above all, you do not have to tackle this alone. Consequently, our experienced team can guide you through every step.
Contact us today, and let us help you correct your return with total confidence.
