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But that's the point, we're really not far off a flat rate tax. A guy earning £25k has a marginal rate of 32% and a guy earning £145k has a marginal rate of 42%.
That's the effective rate - overall tax as a percentage of gross income.
The marginal rate is what the next pound earned is taxed at.
That chart is somewhat out of date (basic rate threshold is now 12,570, for example).
But that's the point, we're really not far off a flat rate tax. A guy earning £25k has a marginal rate of 32% and a guy earning £145k has a marginal rate of 42%.
A sensible progressive taxation system should increase monotonically, not do this: