IIRC it changed a few years ago: I think the interest personal allowance became more generous, so most people in practice don't pay tax on interest (especially

IIRC it changed a few years ago: I think the interest personal allowance became more generous, so most people in practice don't pay tax on interest (especially with interests being so low in the last decade), and those that do, have very different marginal rates, so it made less sense to be paid at source. Banks share information with HMRC, so I expect that compliance is still high, but it is a bit annoying that our tax returns are not prefilled with this info.