NEW HAMPSHIRE SUPPORT GUIDELINE
New Hampshire child support calculator & worksheet
New Hampshire RSA 458-C:3 uses statutory percentages of combined net income, interpolated between statutory income points rather than read from a dense table.
Current module status
| State | New Hampshire |
|---|---|
| Status | Active base worksheet module |
| Guideline model | income shares interpolated annual net |
| Primary income field | Combined annual net income |
How New Hampshire child support law works
Legal starting point. New Hampshire RSA chapter 458-C sets a percentage-based guideline and requires a worksheet that identifies adjusted gross income and the family’s support obligations. The result is presumptive, with statutory provisions for departures and special circumstances. Read New Hampshire RSA 458-C:2–3.
How the guideline is calculated
The table produces a total obligation from adjusted income, and the parents’ shares are apportioned proportionally. Child care, medical support, the self-support reserve, parenting schedules, and special circumstances require the corresponding worksheet analysis.
What this site’s worksheet covers
Uses RSA 458-C:3 percentage table and direct proportional interpolation between income levels. This base worksheet allocates the total support obligation between parents in proportion to adjusted income. Child care, medical support, self-support reserve, parenting-schedule deviation and special circumstances are separate worksheet issues. New Hampshire requires child support obligations calculated under the chapter to be rounded to the nearest whole dollar.
Documents that make the worksheet more useful
New Hampshire guideline worksheet with DHHS standard deductions and reserve. Gather the records that support the income, parenting-time, insurance, child-care, and other adjustment entries that apply to the family. Standardized tax deductions must come from DHHS. The annual base module still requires reconciliation of final payment-period rounding, adjusted-gross allocation, and the complete worksheet before court use.
For a filing or agreement, complete the official court forms linked on this page. They use the same guideline structure explained here, and the court applies it to the facts of the case.
Before you enter your numbers
Is New Hampshire net income just take-home pay?
New Hampshire defines guideline net income using adjusted gross income and standardized deductions published by the agency. Actual payroll withholding can differ from those deductions. The support calculation also includes its self-support reserve and medical-support analysis rather than stopping at a paycheck percentage.
Prepare this: Use the current agency deduction table and worksheet. Keep gross income, statutory adjustments, and standardized deductions on separate lines so their effect can be checked.
Read the relevant official instructions: New Hampshire RSA 458-C:2–3.
These preparation notes explain one part of the state guideline. A new estimate does not change an existing order; a modification request does.
How New Hampshire cases actually get to a number
Determine each parent’s net income as the statute defines it, combine, interpolate the percentage, then allocate. This is closer to a statutory percentage schedule than to a full economic table.
New Hampshire RSA 458-C:3 uses statutory percentages of combined net income, interpolated between statutory income points rather than read from a dense table. That is a different path from neighboring states that use another model, so do not import a table, percentage, or overnight credit from somewhere else.
Parenting time in New Hampshire
Equal or approximately equal parenting time is a statutory adjustment path in New Hampshire, not an informal 50 percent cut. Read the current 458-C provisions on parenting time before applying a credit.
Costs New Hampshire usually treats separately
- Work-related child-care costs
- Medical-support expenses
- Extraordinary medical or educational costs
- Other statutory add-ons
When New Hampshire courts leave the guideline
RSA 458-C lists deviation factors, including a parent’s other dependents and a child’s special needs. Interpolation is required math, not a deviation.
Official New Hampshire forms to keep beside this guide
New Hampshire guideline worksheet with DHHS standard deductions and reserve. Standardized tax deductions must come from DHHS. The annual base module still requires reconciliation of final payment-period rounding, adjusted-gross allocation, and the complete worksheet before court use. The primary authority is the published New Hampshire source. Fill the official form from source documents. Use this page only to check that you chose the right New Hampshire path—primary versus shared, table versus percentage, add-ons versus basic support.
Where this is typically filed
Circuit Court Family Division hears most cases; DHHS DCSS handles IV-D. Use the current RSA 458-C percentages.
Questions specific to New Hampshire
Why interpolate?
The statute sets percentages at specific income levels. Between those points, interpolate rather than jump to the next listed percentage.
Is this combined income or obligor-only?
New Hampshire uses combined net income, then allocates.
Does equal parenting time zero out support?
No. It can change the calculation; it does not automatically eliminate support when incomes differ.
Run the calculator
Open the free support calculator, select New Hampshire, complete the state worksheet, and print or export the output for review.