pyad wrote:Also, banks have to quote the true Annual Equivalent Rate in addition to any headline rate used to promote the account. If there is a difference it will probably be due (apart from bonuses which some pay) to the compounding frequency offered.
There's a marginal difference between paying 0.1% at the end of each month every month and paying 1.2% at the end of a year. The differences are a bit larger when it's 1% a month or 12% a year. Hence the statutory requirement to quote Annual Equivalent Rate which dates back to the era when double digit interest rates were commonplace.
I would assume deposit paying institutions take the payment frequency into account when deciding what they can afford to offer to be both profitable and competitive. Similarly with dividend distributions. If the money isn't distributed it remains in the Company contributing to profits. If it's in a fund it adds to the net asset value in the period before distribution.