Thanks for posting that link, I'm reading it but still don't believe it, as it goes completely against what I've always believed to be true ! Yet it is clearly a UK-government source ! 🤔
I wonder whether they really mean Old-Age-Allowance (aka State Pension) is not even assessable, or whether it's just non-taxable itself, because they don't want to bother to try to collect the tax due on it, due to the paperwork involved for the DWP, who actually make the payments ?
Hence they charge the tax on any other sources of UK-arising income, such as annuities or private-pensions, which take total income-arising past the £12,570 Personal-Allowance, and which method is administratively-easier for HMRC/DWP ?
I'd also view the word "usually" with some suspicion, I wonder what the exceptions are, that they don't spell out ?