How it works · official guideline
How child support is calculated in New Hampshire
New Hampshire multiplies the parents' combined net income by a statutory percentage that depends on the number of children and falls as income rises (for one child, 25.6% at $15,000 or less down to 19% at $125,000 or more), then divides the total between the parents in proportion to their incomes. A self-support reserve and a $50 minimum order protect low-income payers.[1]
Key facts: child support in New Hampshire
| Guideline model | Income shares[1] |
|---|---|
| Percentages | Combined net income $15,000 or less: 25.6% (1 child), 35.5% (2), 42.5% (3), 45% (4+)[1] |
| Percentages | Combined net income $125,000 or more: 19% (1 child), 26% (2), 31% (3), 33.5% (4+)[1] |
| Income counted | Combined net income (adjusted gross income less DHHS standard tax deductions)[1] |
| Guideline last checked | October 26, 2026 |
New Hampshire’s model
Income shares
Statutory percentage of the parents' combined net income (sliding by income and number of children), split by income share.
No official calculator confirmed yet
Read the guideline: RSA 458-C:3The state child support agency or your court clerk can run the official numbers.
Why no calculator here? We publish a calculator only after it reproduces the state’s official numbers exactly. We haven’t matched New Hampshire’s yet.
From the official text
The rules behind New Hampshire’s numbers
The guideline is RSA 458-C:3. Open each rule to read the exact words.
- Percentages
Combined net income $15,000 or less: 25.6% (1 child), 35.5% (2), 42.5% (3), 45% (4+)
At the bottom of the statutory table, the share of combined net income devoted to child support is 25.6% for one child, 35.5% for two, 42.5% for three and 45% for four or more.[1]
Official text · RSA 458-C:3, I(a)
“25.6 percent 35.5 percent 42.5 percent 45 percent”
- Percentages
Combined net income $125,000 or more: 19% (1 child), 26% (2), 31% (3), 33.5% (4+)
At the top of the table the percentages are 19%, 26%, 31% and 33.5%; DHHS publishes a schedule in $1,000 steps, interpolating between the table’s income levels.[1]
Official text · RSA 458-C:3, I(a)
“$125,000 or more 19 26 31 33.5”
- Income counted
Combined net income (adjusted gross income less DHHS standard tax deductions)
Net income is the parents' combined adjusted gross income minus standard deductions for federal income tax, FICA and Medicare that DHHS publishes each year.[1]
Official text · RSA 458-C:2, VI
“"Net income" means the parents' combined adjusted gross income less standard deductions published on an annual basis by the department of health and human services”
- Minimum order
$50 per month
A minimum support order is $50 a month unless the court finds a lower amount appropriate; it applies when the payer’s gross income is below the self-support reserve.[1]
Official text · RSA 458-C:2, V
“"Minimum support order" means an order of support equal to $50 per month, unless the court determines that a lesser amount is appropriate under the particular circumstances of the case.”
- Low income
Self-support reserve: 130% of the federal poverty guideline for one person
If paying the guideline amount would drop the payer below the self-support reserve, support is presumed to be the payer’s income above the reserve, but not less than the $50 minimum.[1]
Official text · RSA 458-C:2, X
“"Self-support reserve" means 130 percent of the federal poverty guideline for a single person living alone, as determined annually by the United States Department of Health and Human Services.”
- Shared parenting time
Similar incomes + each parent over 40% of time: presumption of $0 support
Where parents split costs 50/50, have incomes within 10% of each other and each has more than 40% of parenting time, a $0 order is presumed; more than 35% each supports a presumption of deviation.[1]
Official text · RSA 458-C:2, VIII-c(a) and RSA 458-C:5, I(h)(1)(A)
“An "approximately equal parenting schedule" is a parenting schedule where each parent has parenting time for greater than 40 percent of the annual parenting schedule.”
Guideline: RSA 458-C:3 (New Hampshire General Court), checked October 26, 2026.
Estimate and general information only — not legal advice. MediationList is a directory, not a law firm, and doesn’t endorse any mediator. Guidelines change; confirm with the state child support agency or your court (sources checked October 26, 2026). See also divorce laws in New Hampshire and child support in every state.
Sources
New Hampshire’s child support guideline, rules and official tools, read on the official sites, with the date we checked each.