Summary
If you make <b>13,980,000 円</b> a year living in <b>Japan</b>, you will be taxed <b> 4,099,138 円</b>. That means that your net pay will be <b>9,880,862 円</b> per year, or <b>823,405 円</b> per month. Your average tax rate is <b>29.3%</b> and your marginal tax rate is <b>37.2%</b>. This marginal tax rate means that your immediate additional income will be taxed at this rate. For instance, an increase of <b>100 円</b> in your salary will be taxed <b>37.15 円</b>, hence, your net pay will only increase by <b>62.85 円</b>.
Bonus Example
A <b>1,000 円</b> bonus will generate an extra <b>629 円</b> of net incomes. A <b>5,000 円</b> bonus will generate an extra <b>3,143 円</b> of net incomes.