Annual income refers to the total amount of money you earn in a year from your job, and it can include more than just your base salary. Typically, it encompasses bonuses, overtime pay, and allowances, but it might not include non-monetary benefits like health insurance or retirement plans. Companies usually calculate annual income by adding up your monthly or weekly salary, then multiplying it by the number of pay periods in a year, and finally adding any additional forms of compensation you're eligible for, such as bonuses or commissions, to get the total annual figure.