Your salary reaches the Additional Rate band (45%). You also lose your entire Personal Allowance due to the taper above £100,000, meaning all your income above £125,140 is taxed at 45%.
Your estimated Income Tax on £150,000 is £48,675, giving you an effective Income Tax rate of 32.5%. Combined with National Insurance of £5,011, your total deductions are £53,686, or 35.8% of your gross salary.
Since your salary exceeds £50,270, the portion above this amount is taxed at the Higher Rate of 40%. National Insurance also drops from 8% to 2% above this threshold, providing a small offset.
No Personal Allowance: Your income exceeds £125,140, so you have no Personal Allowance. All income above £125,140 is taxed at the Additional Rate of 45%.