You may be entitled to up to £1000 of interest and not have to pay tax on it. This is known as your Personal Savings Allowance.
A PPI refund comprises of premiums paid, interest charged and a statutory credit interest figure, which is taxable. You may be eligible to claim a refund on the tax paid on up to the first £1000 of statutory interest awarded for basic rate taxpayers.
You will need to enter your contact details, your NI Number and your annual income from employment or pension(s) for the tax year in which you received your PPI refund.