If you make USh 1,000,000 a year living in Uganda, you will be taxed USh 50,000. That means that your net pay will be USh 950,000 per year, or USh 79,167 per month. Your average tax rate is 5.0% and your marginal tax rate is 5.0%. This marginal tax rate means that your immediate additional income will be taxed at this rate. For instance, an increase of USh 100 in your salary will be taxed USh 5, hence, your net pay will only increase by USh 95.
A USh 1,000 bonus will generate an extra USh 950 of net incomes. A USh 5,000 bonus will generate an extra USh 4,750 of net incomes.