How do I submit a tax refund?

As a self-employed person, you're not required to make a separate claim for a tax refund, as you can [claim it through your Self Assessment tax return](https://www.gov.uk/self-assessment-tax-returns/corrections#:~:text=To claim a refund%2C go,for a payment on account).).

If you've overpaid your payments on account, you can request a refund by completing form SA303.

If you've made a mistake on your Self Assessment tax return, you need to amend or correct the return using the Self Assessment portal. You may be asked to show proof of evidence.