Reviewed August 2026
Child Support in New Hampshire
New Hampshire calculates child support using the income shares model. It is set out in RSA 458-C, the state's child support guidelines statute. The formula adds both parents' net incomes together. It finds the total support amount the state's schedule assigns to that combined income. Then it divides that amount between the parents, based on each one's share of the total. A New Hampshire parent can get a support order through a family division case, or by applying to the state's Division of Child Support Services. RSA 458-C applies whether parents were married or not. It is meant to produce a presumptively correct amount, unless a party shows applying it would be unjust. The New Hampshire circuit court's family division handles child support matters. The Division of Child Support Services, part of the Department of Health and Human Services, is the state's IV-D agency. It helps parents who need to establish or enforce an order outside a private filing.
Virdix's document-preparation product currently prepares divorce paperwork for California and Florida cases. This page explains how child support works under New Hampshire law for people researching before they file. It is not legal advice, and Virdix does not prepare or file New Hampshire paperwork. See how Virdix works for California divorces.
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The RSA 458-C income shares formula
RSA 458-C tells New Hampshire courts to combine both parents' net incomes. The court applies the state's guidelines schedule to that combined figure, to find the total obligation. Then it divides that obligation between the parents, in proportion to each one's share of the combined income.
The statute also covers health insurance costs and work-related child care. A court can deviate from the guideline amount in specific circumstances the statute lists, such as when the guideline result would be unjust given the parents' actual situation. The court must state its reasons for deviating on the record.
Applying through the Division of Child Support Services
New Hampshire's Division of Child Support Services sits inside the Department of Health and Human Services. It is the state's IV-D agency. A parent can apply through the division for paternity establishment, a support order, or enforcement of an existing one.
A parent already in a family division case for divorce or parenting matters can also have support set directly in that case.
Which court hears the case
The family division of the New Hampshire circuit court handles child support. This covers divorce, parental rights and responsibilities, and paternity cases. The judicial branch's self-help resources describe the forms and process for parents representing themselves.
Cases the Division of Child Support Services opens administratively can also reach the family division, if a party requests a hearing.
Modifying a New Hampshire order
A New Hampshire order can be modified after a substantial change in circumstances since it was issued. RSA 458-C also sets out another path: if reapplying the guideline to updated incomes would change the amount by a set percentage, that alone can support modification. A parent does not need to prove a separate, unrelated change on top of that.
A parent requests modification either through the family division case, or through the Division of Child Support Services if the agency is enforcing the order.
Enforcement
The Division of Child Support Services enforces New Hampshire orders using standard IV-D tools. These include income withholding, intercepting state and federal tax refunds, credit bureau reporting, and license suspension for parents with significant arrears.
A parent owed support who needs enforcement help can open a case with the division. This works even when the original order came from a private family division filing.
Sources: RSA 458-C, New Hampshire Child Support Guidelines, New Hampshire Judicial Branch (courts.nh.gov), New Hampshire DHHS (Division of Child Support Services)
Not independently confirmed
- The exact percentage threshold RSA 458-C uses for streamlined modification should be confirmed against the current statute text at filing time.
- Live courts.nh.gov and dhhs.nh.gov pages returned a 403 to automated verification at drafting time; sources above use archive.org snapshots as instructed. Confirm the live self-help and DCSS pages directly before publishing.
Child Support in New Hampshire: frequently asked questions
What model does New Hampshire use for child support?+
New Hampshire uses the income shares model under RSA 458-C. The formula combines both parents' net incomes, applies the state's guideline schedule to the combined amount, and divides the resulting support obligation between the parents based on each one's share of the total income.
How do I apply for child support services in New Hampshire?+
Through the Division of Child Support Services, part of the Department of Health and Human Services, New Hampshire's IV-D agency. The division can help establish paternity, set a support order, and enforce an existing one. A parent with an open family division case can also have support decided directly in that case.
Which court hears child support cases in New Hampshire?+
The family division of the New Hampshire circuit court handles child support connected to divorce, parental rights and responsibilities, and paternity cases. Administrative cases opened through the Division of Child Support Services can also come before the family division if a party requests a hearing.
How do I modify a New Hampshire child support order?+
By showing a substantial change in circumstances, or through the path RSA 458-C sets out, which allows modification when reapplying the guideline to current incomes would change the amount by the percentage the statute specifies. A parent requests modification through the family division case or through the Division of Child Support Services for agency-enforced orders.
Can a New Hampshire court deviate from the guideline amount?+
Yes. RSA 458-C allows a court to deviate from the presumptive guideline amount in specific circumstances the statute lists, such as where the guideline result would be unjust given the parents' actual situation, but the court must state its reasons for deviating on the record.
What enforcement tools does New Hampshire use for unpaid child support?+
The Division of Child Support Services can withhold income, intercept state and federal tax refunds, report arrears to credit bureaus, and pursue license suspension once a parent falls significantly behind. A parent owed support can open a case with the division to begin enforcement regardless of how the original order was obtained.
This page is general information about child support in New Hampshire, not legal advice for your situation. Laws, fees, and procedures change over time; confirm current details with New Hampshire's own courts before relying on anything here. Virdix is not a law firm and is not licensed to practice law in New Hampshire. Virdix does not prepare or file New Hampshire divorce paperwork. It is not a substitute for an attorney licensed in New Hampshire.
More New Hampshire divorce guides
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