Calculate Child Support
Before taxes. Include wages, self-employment, bonuses.
New Hampshire uses the Income Shares — both incomes required.
0 = no custody · 91 = 25% · 182 = 50/50 · 365 = full custody
$0
estimated monthly support payment
⚠️ Estimate only. Actual court-ordered amounts may vary. Verify with a licensed New Hampshire family law attorney.
ℹ️ New Hampshire uses the Income Shares — New Hampshire uses Income Shares based on combined gross income.
How Child Support Works in New Hampshire
New Hampshire uses the Income Shares to determine child support obligations.
The Income Shares model combines both parents' incomes, finds the basic support obligation from a state schedule, then divides it proportionally. More parenting time (overnights) reduces the non-custodial parent's payment through a parenting time credit.
How New Hampshire Compares to Other States
See how New Hampshire's child support rules compare to other states.
| State | Formula | Support Ends | Arrears Rate | Mod. Threshold |
|---|---|---|---|---|
| ★ New Hampshire (you) | Income Shares | 18 | 6% | 15% |
| Delaware | Melson Formula | 18 | 5% | 10% |
| Idaho | Percentage of Income | 18 | 5% | 15% |
| Michigan | Income Shares | 18 | 5% | 10% |
| Ohio | Income Shares | 18 | 5% | 10% |
| Alaska | Percentage of Income | 18 | 6% | 15% |
| Florida | Income Shares | 18 | 6% | 15% |
| Louisiana | Income Shares | 18 | 6% | 25% |
| North Dakota | Income Shares | 18 | 6% | 10% |
Showing 8 comparison states. View all 50 states →
Frequently Asked Questions
How is child support calculated in New Hampshire?
New Hampshire uses the Income Shares model. New Hampshire uses Income Shares based on combined gross income.
When does child support end in New Hampshire?
Child support generally ends when the child turns 18 in New Hampshire.
Can I modify child support in New Hampshire?
Yes. New Hampshire requires a 15% or greater change in income to qualify. Use our modification checker →
Does 50/50 custody eliminate child support in New Hampshire?
Not automatically. The higher-earning parent typically still pays support with 50/50 custody. See our 50/50 guide →
What income is used for child support in New Hampshire?
Income includes wages, self-employment, bonuses, rental income, unemployment benefits, disability payments, and Social Security. Courts may impute income if a parent is voluntarily underemployed.