FamilyLawFinder

How New Hampshire Calculates Child Support

New Hampshire uses the Income Shares model to determine child support obligations. This page explains the guidelines, formula, and key factors.

Model Type

Income Shares

Income-shares model based on combined adjusted gross income and number of children; adjusted gross is gross income minus FICA, federal/state income taxes, and mandatory retirement; each parent's obligation prorated by income share; adjusted for parenting schedule and add-ons.

Income Basis & Definitions

Income Basis:

net (adjusted gross)

Number Of Children On Order

Selects percentage applied to combined net income.

Source: RSA 458-C:3: Percentage of combined net income by number of children
Parent A Income

Parent A adjusted gross income (gross minus specified deductions).

Source: RSA 458-C:2: Adjusted gross income definition
Parent B Income

Parent B adjusted gross income.

Source: RSA 458-C:2: Adjusted gross income definition

Parenting Time Handling

Custody Type Or Worksheet Selection

Calculator adjusts for parenting schedule.

Source: RSA 458-C:5: Parenting schedule adjustment
Parenting Time Input

Percentage of residential responsibility with each parent.

Source: Parenting time input

Deductions & Adjustments

Other Child Support Or Dependents Adjustment

Preexisting support obligations reduce available income.

Source: RSA 458-C:2: Other support obligations
Spousal Support Adjustment

Alimony paid adjusts income.

Source: Alimony deduction

Add-Ons & Allocation

Work Related Childcare Costs

Childcare costs allocated.

Source: Childcare costs
Child Health Insurance And Uninsured Medical

Health insurance and uninsured medical allocation.

Source: RSA 458-C:3-a: Medical support

Caps, Minimums & Deviations

Income Cap And Above Cap Handling

Guidelines apply to combined net income up to statutory cap; above-cap at discretion.

Source: Income cap
Deviation Factors And Findings

Special circumstances deviation per RSA 458-C:5.

Source: RSA 458-C:5: Special circumstances

Try the Calculator

Use our New Hampshire child support calculator to estimate your obligation.

Official Sources

New Hampshire RSA 458-C (Child Support Guidelines)