Child Support Calculator

What Is Child Support?

Child support is a court-ordered payment made by the non-custodial parent to the custodial parent to help cover a child's living expenses. The goal is to ensure that children receive the same financial support they would have if both parents lived together. Most jurisdictions base child support calculations on a combination of each parent's income, the number of children, and the custody time split.

The Income Shares Model

The Income Shares Model is the most widely used approach for calculating child support in the United States. Under this model, both parents' incomes are combined to determine a "basic child support obligation" based on state-specific guidelines. Each parent then contributes a percentage proportional to their share of the combined income. This approach recognizes that children are entitled to the same proportion of parental income they would receive in an intact household.

Factors That Affect Child Support Payments

Several key variables influence the final child support amount:

• Parental Income: Gross or net income from wages, self-employment, bonuses, and investment earnings. Some states include income from a new spouse in certain circumstances.
• Number of Children: Support amounts increase with each additional child, though usually at a diminishing marginal rate.
• Parenting Time: The number of overnight stays each parent has directly affects the calculation. Shared parenting arrangements (typically 35% or more time with each parent) can result in adjusted obligations.
• Additional Expenses: Health insurance premiums, medical expenses not covered by insurance, child care costs, and educational expenses are typically added on top of the basic obligation.
• Extraordinary Circumstances: Special needs children, high-income parents above guideline caps, or parents with significantly reduced earning capacity can lead to deviations from standard formulas.

Understanding Child Support Guidelines

Each state publishes its own child support guidelines, typically updated every four years. These guidelines include a schedule (table) that maps combined parental income to a basic obligation amount. The schedule accounts for economies of scale (larger families spend proportionally less per child) and incorporates estimates of what parents typically spend on their children. While guidelines provide consistency, judges retain discretion to deviate when the standard calculation would be unjust or inappropriate.

Child support is closely related to other family financial obligations. Explore the Alimony Calculator to understand spousal support, or use the Income Tax Calculator to see how child support payments (which are tax-neutral under current federal law) affect your overall tax picture. For broader financial planning, try the Budget Calculator, Emergency Fund Calculator, or Savings Calculator.