The first part of the formula sets the bonus month to January (1)
Start Date < date - 6 ensures employees have been with the company at least 6 months before receiving a bonus
Annual Salary * Bonus Target % results in the bonus amount. Multiplying by Headcount will ensure that the bonus is paid only if the employee is active (see Headcount formula above)
Note that the Bonus Target % can be set at Department level, seniority, or any other level depending on how you map your categories