New Hampshire uses the Income Shares model — both parents’ gross incomes are combined. Updated for 2026 — covers 50/50 custody, arrears, modifications and New Hampshire child support laws.
BothParents Income
NoneIncome Cap
18Age Support Ends
6%Arrears Interest
🍂 New Hampshire Income Shares Model
New Hampshire Child Support Calculator 2026
New Hampshire uses the Income Shares model — both parents’ gross incomes are combined.
ℹNew Hampshire uses gross income — Gross = total income before any deductions.
$
$0$20k
$
$0$20k
$
$
Estimated Monthly Child Support
$0
per month
Annual Total
$0
Combined Income
—
Until Age
18
* Estimate using official New Hampshire income shares formula. Courts may deviate based on special circumstances. Consult a New Hampshire family law attorney for your specific situation.
🍂 How New Hampshire Calculates Child Support
ModelIncome Shares — both parents’ combined gross income
Income CapNo set cap — courts use discretion
Minimum Order$50/month minimum regardless of income
Arrears Interest6% annual interest on unpaid arrears
New Hampshire Key RuleNew Hampshire uses combined gross income of both parents in its Income Shares calculation
Additional InfoNew Hampshire has no state income tax — and uses gross income for child support
⚖ 50/50 Custody in New Hampshire
Does Child Support Apply With 50/50 Custody in New Hampshire?
In most cases, yes. New Hampshire does not automatically eliminate child support with equal parenting time.
✓General rule: With 50/50 custody, the higher-earning parent typically pays the lower-earning parent. The amount is reduced vs sole custody but rarely reaches $0.
$
$0$15k
$
$0$15k
Estimated Monthly Payment
$0
per month
Without Custody Adj.
$0
Custody Reduction
$0
Net Payment
$0
* 50/50 custody calculations are complex. This is an approximation. Consult a New Hampshire family law attorney for exact figures.
📋 New Hampshire Arrears Calculator
New Hampshire Child Support Arrears Calculator
Calculate total back child support including 6% annual interest New Hampshire applies to unpaid arrears.
⚠New Hampshire charges 6% annual interest on all unpaid child support arrears.
$
$
$
Total Arrears Owed (with 6% Interest)
$0
including New Hampshire 6% annual interest
Base Arrears
$0
Interest Accrued
$0
Clear in 1 Year
$0
Clear in 2 Years
$0
Clear in 3 Years
$0
Support Ends Age
18
* New Hampshire applies 6% annual interest to unpaid child support. There is generally no statute of limitations on child support debt.
🔄 Modification Estimator
New Hampshire Child Support Modification
Estimate your new payment and check if you qualify for a modification in New Hampshire.
ℹModification rule: Most states allow modification when the new amount differs by 15-20% or $100/month, OR when there is a material and substantial change in circumstances (job loss, new child, custody change).
$
36+ months = eligible for routine review
$
Estimated New Monthly Payment
$0
per month
Current Order
$0
New Calculated
$0
Difference
$0
% Change
0%
Likely Qualifies?
—
Time Since Order
—
* Qualification estimate only. Consult a New Hampshire family law attorney before filing.
📜 Updated 2026
New Hampshire Child Support Laws 2026
Key rules, age cutoffs and what you need to know in New Hampshire.
FORMULA How New Hampshire Calculates Child Support
New Hampshire Revised Statutes Section 458-C governs child support. New Hampshire uses Income Shares with published schedule tables. No state income tax simplifies the gross income calculation.
AGE When Does Child Support End in New Hampshire?
Child support in New Hampshire ends when the child turns 18 — Support ends at 18 or high school graduation. Support also ends upon the child’s death, marriage or emancipation. Important: In most cases support does not stop automatically — you need a court order. Stopping payments without a court order creates arrears even after the child reaches the cutoff age.
INTEREST Arrears Interest in New Hampshire
New Hampshire charges 6% annual interest on unpaid child support arrears. There is generally no statute of limitations on child support debt.
ENFORCEMENT New Hampshire Child Support Enforcement
New Hampshire has broad enforcement powers including wage garnishment, tax refund interception, driver’s license suspension, professional license suspension, passport denial, and credit bureau reporting. Criminal charges may apply for significant or long-term non-payment.
MODIFY Modifying Child Support in New Hampshire
Child support can be modified in New Hampshire when there is a material and substantial change in circumstances — typically a significant income change, job loss, new children from another relationship, or change in custody. Most states also allow a periodic review every 3 years. File a petition with the court — private agreements to change support are not legally enforceable.
📅 New Hampshire Payment Calendar
Child Support Payment Calendar 2026
Generate your personal payment schedule and track payments month by month.
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Monthly Total
$0
Annual Total
$0
Next Payment
—
Days Until Due
—
Payments Remaining
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Marked Paid
$0
* Click Mark as Paid to track payments. Always keep payment receipts.
Need a New Hampshire Family Law Attorney?
This calculator provides estimates. For filing, modifying or enforcing a child support order, connect with a local family law attorney.