Summary
If you make 2,839,200,000 円 a year living in Japan, you will be taxed 1,305,007,309 円. That means that your net pay will be 1,534,192,691 円 per year, or 127,849,391 円 per month. Your average tax rate is 46.0% and your marginal tax rate is 46.1%. This marginal tax rate means that your immediate additional income will be taxed at this rate. For instance, an increase of 100 円 in your salary will be taxed 46.10 円, hence, your net pay will only increase by 53.90 円.
Bonus Example
A 1,000 円 bonus will generate an extra 539 円 of net incomes. A 5,000 円 bonus will generate an extra 2,695 円 of net incomes.