Arizona Child Support Guidelines, which adhere to the Income Shares Model. This model determines child support based on the incomes of both parents, aiming to approximate the amount that would have been available to the children if the household were intact. The guidelines involve a detailed, multi-step calculation process that adjusts for various child-related costs, ensuring that child support reflects fair contributions from both parents. These guidelines are mandatory for courts to apply under state and federal law, and deviations are only allowed under specific conditions to better meet the needs of the children involved .