How can I calculate if my monthly ISA interest is correct?

masonic

I know how crazy this is going to sound, but if you check out the key product information (and if you're feeling really adventurous, take a look at the T&Cs), you can find out about at least some of these undesirable features (transfers in earning a lower rate, bonus interest being held back until you've had the account for a year, etc) before you open the account and commit £80k of your money.