Originally posted by St Jude
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Firstly, you need to understand how employers NI is calculated. It is not 13.8% of the total gross, but 13.8% of employee gross, which is around 12.1% of the total gross. And the other taxes are taken from the employee gross.
Last time I did the maths the two rates were roughly 40% (basic) and 49% (higher)
You have also forgotten to account for your personal allowance in reaching the higher rate tax threshold. The 40% band kicks in at 34370+8105 = 42475, almost exactly the point when the NI drops down. So that big chunky band applies to less than a tenner of salary.
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