@ShyMaryEllen
"but there is no reason why pension income shouldn't be taxed."
ALL Pension income is taxed, including the State Pension.
It is True, that pensioners do not pay NI (so will not benefit from the recent cut in NI). Similarly those on less that 12,570 a year do not pay NI, so, A pensioner on just the state pension would not pay NI, anyway. (they would probably be entitled to some extra benefits).
I should add that the State pension is Less than the personal allowance, and there is no provision for collecting income tax via the state pension. Instead, as you would only pay income tax if you had an additional personal pension, then the state pension is taken into account on your tax code.
I personally think they could abolish the 10.00 xmas bonus introduced in 1972 (and not changed since), on the basis of the administration. In My opinion it would be better to have this as part of the state pension.
Similarly ther is a winter fuel allowance, which is paid to the household. (So, if two state pensioners in the house, 50 percent is paid to each).
I think the admin on this is not worth it, but once given it is hard to take something away. And if it is added to the state pension, then it becomes more difficult, as I said a single household pensioner gets the total amount, presumably on the basis that it is meant to help with heating, so it is heating one house/residence whether 1 or 2 people live there.
Also, it should be noted that the xmas bonus and the winter fuel allowance, I think are NOT taxable.
I still think they should be absorbed into the pension, and avoid the admin of the extra benefits.
I think this was introduced on the basis that elderly people find it more difficult to regulate their body temperature, and are also less active and unable to generate their one heat.
What people do not realise is that the pension rules have changed over the years, and it was not until the 1980s that one could have a portable personal pension. Before that the pension remained with the company, and in sone cases (before reforms), the company embezzled money from the pension funds, leaving the employee with nothing (see Daily Mirror, Maxwell, etc).