The UK and US have very different tax systems. The UK has a progressive income tax system where the higher your income the more tax you pay. The US has a flat income tax system where the higher your income the less tax you pay.
This means that the UK will always have higher taxes than the US for the same level of income. However, if you have more income in the UK than in the US, you will pay less tax in the UK than you would in the US.
This means that if you have a high income and live in the UK, you will pay less tax than if you lived in the US.
For example, if you earn £100,000 per year in the UK and £80,000 per year in the US, you will pay £1,200 per year in the UK and £1,200 per year in the US.
However, if you earn £100,000 per year in the UK and £120,000 per year in the US, you will pay £1,200 per year in the UK and £1,200 per year in the US.
This means that the UK has a progressive income tax system where the higher your income the more tax you pay.