Do I have to pay tax on my interest?

Depending on your individual circumstances, you may need to declare your earnings to HRMC if they exceed your annual Personal Savings Allowance (PSA). Introduced in 2016/17, the PSA gives all tax-payers a tax-free savings allowance. If you're a basic rate tax-payer, you can earn up to £1,000 per year tax-free. Higher earners can earn up to £500 per year.  

You may need to consider paying tax on earnings for the tax year during which the interest was applied to your account.