This gives money to richer voters because the higher your earnings, the more tax saved. But corporation tax takes money from rather anonymous entities, which of course affects voters too in the end but in a rather indirect way.
a rise of the zero rate equally effects anyone earning above the new zero rate threshold (regardless of how much they are above it [1])
a full time minimum wage employee earning ~£14,000/year gets exactly the same reduction in tax from this specific increase as an engineer on £90,000/year
[1]: once you get above £100,000/year your personal allowance goes down (ultimately to zero)
However I agree that anyone earning over £100K won't be affected because of the peculiar system where you lose the personal allowance in steps over this threshold.
> Personal allowance (zero tax band) raised to £12,500 from April (in the Budget today). This gives money to richer voters because the higher your earnings, the more tax saved.
the conclusion of which is factually incorrect, and unsupported by your linked chart (which includes more than just the increase in the zero rated band)
The fun thing is that total marginal income tax between those two numbers is 60% without counting national insurance.
Could you elaborate?