Bonuses are calculated annually and will grow in line with employment income, as set in the Employment screen's Growth field.
Note - The default growth rate on earnings, including bonuses, is set initially to the National Average Earnings setting in Plan Preferences.
If bonuses need to be grown at a different rate than income or entered as a fixed amount, consider entering them as a separate item from the main employment income.
If you need to increase or decrease bonuses in the future, you can do so using the Employment screen's Steps facility, which allows bonuses, income, dividends and benefits in kind to be increased or decreased (stepped up or down) at future events.
Events are used to schedule future steps.