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The logic is to work out what the parents would have spent on the child if the household had stayed together, then divide that between them in proportion to their incomes.
So if the combined income is $120,000 and one parent earns $80,000, that parent is responsible for roughly two thirds of the child’s costs. The parent the child lives with less pays their share to the other.
A minority of states apply a percentage of the paying parent’s income alone, rising with the number of children. Simpler, and it does not account for the other parent’s earnings.
Used in a few states. A variation on income shares that first reserves each parent a basic self-support allowance, then allocates the rest.
Broader than salary. Guidelines generally include wages, self-employment income, bonuses and commissions, overtime where it is regular, rental income, investment income, pensions and retirement distributions, Social Security benefits, unemployment and disability payments, and in many states significant recurring gifts.
Courts can also impute income to a parent they find to be voluntarily unemployed or under-employed, calculating support on earning capacity rather than actual earnings.
This is where most later disputes come from. The guideline amount is generally meant to cover ordinary costs — food, housing, clothing, routine expenses. It usually does not cover:
These are usually shared in proportion to income, but only if the order says so. An order that is silent on them produces an argument every time one arises. Specify how they are approved, how receipts are shared, and the deadline for reimbursement.
Courts can order a different amount where the guideline figure would be unjust — very high combined income, a child with extraordinary needs, a parent with unusual obligations — but they must normally give written reasons.
Parents can agree to a different figure, but a judge still has to approve it, and judges will not approve an amount that leaves a child short. Child support belongs to the child, not to the receiving parent, which is why it cannot be waived in exchange for something else.
Orders can be modified on a substantial change in circumstances — a significant involuntary change in either income, a change in the parenting schedule, a change in the child’s needs. Many states also allow a review every few years regardless.
The critical point: modification is not retroactive in most states. It takes effect from the date you file, not the date your circumstances changed. A parent who loses their job and waits six months to file usually still owes the old amount for those six months, and arrears generally cannot be discharged in bankruptcy. File immediately, even if the paperwork is imperfect.
An informal agreement between parents to change the amount does not modify the order. Only the court does that.
Every state has a child support enforcement agency, and the tools are substantial: wage withholding, which is the default in most new orders, interception of tax refunds, suspension of driving and professional licences, liens on property, credit reporting, passport denial, and contempt proceedings.
Support and parenting time are separate obligations. A parent who is owed support cannot withhold the children, and a parent who is denied time cannot stop paying. Courts treat both as violations.
Pay through the state disbursement unit where one exists, so payments are recorded independently. Where payments pass directly between parents, keep traceable records — cash is the most common cause of disputes about whether support was paid at all.
Warning: This post is neither financial, health, legal, or personal advice nor a substitute for the advice offered by a professional. These are serious matters, and the help of a professional is recommended as it can impact your future.