When to report NS&I’s Guarantee Bond interest payment

Hi I would like to buy a Two Years NS&I’s Guaranteed Growth Bond. I will get back the principal and interest on the maturity date. However, there’s a feature of interest rates on the summary box: “We calculate the interest daily and add it to your Bond on each anniversary of investment.” When I fill in the self assessment, should I report the interest income each year in the coming two taxation years? Or report all interest income (i.e. two years interest income) as a whole on the maturity date? Thank you for your assistance.

Hi,
If you can access the interest when it is added, you report it in that year. if not then it is the year of maturity.
Thank you.