Summary
If you make £315,000,504 a year living in United Kingdom, you will be taxed £151,970,404. That means that your net pay will be £163,030,100 per year, or £13,585,842 per month. Your average tax rate is 48.2% and your marginal tax rate is 48.3%. This marginal tax rate means that your immediate additional income will be taxed at this rate. For instance, an increase of £100 in your salary will be taxed £48.25, hence, your net pay will only increase by £51.75.
Bonus Example
A £1,000 bonus will generate an extra £518 of net incomes. A £5,000 bonus will generate an extra £2,588 of net incomes.