Child Support in New Hampshire: How Much Will You Owe?

Quick answer: it depends on both parents' incomes, how many children you have, and the parenting schedule. The calculator on this page turns those numbers into a real guideline estimate in about a minute. It is an educational estimate, not legal advice, and the judge always sets the final amount. FamilyCourtHelp.com is a self-help resource, not a law firm.

Wondering how much child support you will owe or receive in New Hampshire? The state uses one formula everywhere, so the same math applies in every county. This page explains how it works, lets you run a live estimate, and links to a dedicated page for each county at the bottom.

New Hampshire follows the Income Shares model under RSA 458-C. The court combines both parents' monthly net incomes, looks up the basic support obligation on the state's guideline schedule for that income level and number of children, then prorates the obligation between the parents according to each parent's percentage share of the combined income.

What counts as income? New Hampshire runs the formula on net income, meaning income after taxes come out. Gross income from any source, wages, salaries, commissions, self-employment, royalties, bonuses, severance, pensions, retirement, dividends, interest, rental income, Social Security, workers' compensation, and unemployment.

Parenting time matters directly in New Hampshire: the number of overnights each parent has changes the math itself. New Hampshire uses a shared-care parenting-time formula, and the prose explains that a parenting-time adjustment applies when a parent's overnights exceed 30 percent of the year. Below that threshold, the standard prorated obligation generally stands. Above it, the formula recognizes that the parent with significant overnights is already covering more day-to-day costs. The on-page calculator gives an estimate only, so confirm any shared-parenting adjustment on the official worksheet or with a licensed attorney.

When does it end? New Hampshire child support generally ends at age 18 or upon graduation from high school, whichever is later, but not past age 19. Continuing support for disabled adult children is available.

Can the amount change later? File a petition in family division of circuit court or request review through DCSS. A 20% variance or substantial change in circumstances supports modification.

If payments fall behind, New Hampshire has real enforcement tools. New Hampshire DCSS enforces through immediate income withholding, tax intercept, license suspension, lien filings, credit reporting, and contempt referrals.

Child support cases in New Hampshire are generally handled through the state's Circuit Court, and New Hampshire Division of Child Support Services (Department of Health and Human Services) runs the state's child support services program. Forms and local practice can vary, so confirm the current details with your local court or the agency.

The calculator on this page is the same live engine behind our full Child Support Calculator. Enter both incomes, the number of children, and the overnight split, and the estimate updates instantly. The full calculator page adds extras like health insurance, child care costs, and saved scenarios.

Bottom line for New Hampshire: the guideline number comes from incomes, children, and parenting time. Run the estimate on this page, keep your paperwork honest and complete, and let the court confirm the final amount.

Frequently asked questions

How much child support will I owe in New Hampshire?

There is no flat amount. New Hampshire uses the Income Shares model under RSA 458-C, so the number depends on both parents' incomes, the number of children, and the parenting schedule. The calculator on this page gives you a guideline estimate, and the court sets the final amount.

When does child support end in New Hampshire?

Age 18, or up to graduation from high school not past age 19, whichever is later.

Can the child support amount be changed later in New Hampshire?

Usually yes, when circumstances change enough. A 20% change between the existing order and a new guideline calculation, or any substantial change in circumstances.

Who handles child support cases in New Hampshire?

Cases are generally heard in the state's Circuit Court, and New Hampshire Division of Child Support Services (Department of Health and Human Services) handles services like locating parents, establishing orders, and collecting payments.