Just because it has always been done does not mean it is always the right thing to do. Lowering the tax rate while receiving more income is good. Maintaining the tax rate at a higher level does not mean there would have been a lower tax rate.
This has been studied by economists for decades. The overwhelming consensus is that lowering corporate tax has a positive effect on economic growth, employment and wages.
Look, I do understand your preference of prioritising the people, but this is exactly what it does. I'm not saying this because I think it's better for businesses. It directly impacts people as well. If you increase the corporate tax rate and (possibly) make more in tax receipts, there's a huge risk of companies responding by reducing expenses (wages and staff) and increasing income (higher prices).
And I say possibly because, if the UK tax rate becomes less competitive, it can drive company HQs to more favourable countries where we get none of the tax at all. We could easily end up taking a bigger chunk of a smaller amount.
You may think this is unlikely to happen, but with a hike of this magnitude, many companies will lose out to the tune of hundreds of millions. It would therefore make perfect monetary sense to utilise cost-cutting measures, including the possibility of shifting base operations elsewhere. Even with the cost of the upheaval, they could be better off within a year.
It's human behaviour 101. When you're suddenly making less money, you adapt, and not in a way which is good for the millions of working people across the UK.
One important point, however, is that the effectiveness of corporate tax reductions is based heavily on relevance to other countries. It's not arbitrary. How low the rate should go depends on how competitive other tax rates are across the world.
This is why I believe that 19% is sufficiently low and that it shouldn't go to 17%. It's competitive enough and will attract more business and investment to the UK.
But one thing this proposed tax rise is guaranteed to do is to make the UK far less appealing for inwards investment and new companies. It makes the situation of the job creators, product suppliers and service suppliers more difficult. It creates an unfavourable environment for expansion and investment.
And this is made far worse by the situation of increasing the rate from its current low. Are businesses just going to sit by and see their net profit dwindle without action when they have shareholders and investors to please? Not a chance. Axes will start to fall.
The Institute for Fiscal Studies has it spot on. Taxes are paid by people. Increase the rate, and when all is said and done, it's the people who will bear the burden.
I share the exact same concerns about you regarding ordinary people. This is why I'm so concerned about this proposal. It's going to make people worse off.