Summary
If you make $20,823,920 a year living in Australia, you will be taxed $9,757,909. That means that your net pay will be $11,066,011 per year, or $922,168 per month. Your average tax rate is 46.9% and your marginal tax rate is 47.0%. 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 $47, hence, your net pay will only increase by $53.
Bonus Example
A $1,000 bonus will generate an extra $530 of net incomes. A $5,000 bonus will generate an extra $2,650 of net incomes.