Calculation is client-side, income figures are never transmitted or stored.
How North Dakota Child Support Is Calculated
- North Dakota is NOT an income-shares state -- the child support amount is based entirely on the paying (obligor) parent's OWN monthly net income and the number of children. The other parent's income is never part of the calculation.
- Look up the paying parent's net monthly income and the number of children in the official Child Support Guidelines schedule to get the base support amount.
- If the paying parent's court-ordered parenting time exceeds 100 overnights per year ("Extended Parenting Time"), the amount is reduced by a credit factor of (365 minus overnights times 0.32), divided by 365.
- This calculator does not model Equal Residential Responsibility (when both parents have exactly equal time, a different cross-offset calculation applies) or Split Custody (each parent primary for at least one different child).
North Dakota Child Support Worksheet Walkthrough
Example: the paying parent has net monthly income of $2,000, and there are two children. The children spend 150 overnights per year with the paying parent (Extended Parenting Time, since it exceeds 100).
- Base amount from the schedule at $2,000 net income, two children: $562/month.
- Extended Parenting Time credit factor: (365 - 150 x 0.32) / 365 = 317 / 365 = 86.85%.
- Adjusted obligation: $562 x 86.85% = $488/month.
How This Calculator Works — Formula & Constants
Source: North Dakota Legislative Council — N.D. Admin. Code § 75-02-04.1-10 · Calcul déterministe — no AI, no arbitrary estimate.
Constants used
| Constant | Value | Source |
|---|---|---|
| Extended Parenting Time threshold | 100 overnights/yr | N.D. Admin. Code § 75-02-04.1-10 |
Formula
if paying_parent_overnights > 100:
credit_factor = max(0, 365 - overnights × 0.32) / 365
obligation = base_obligation × credit_factor
Deterministic calculation based on North Dakota's official Child Support Guidelines schedule (NDAC 75-02-04.1-10). Verify against North Dakota's official worksheet for a court-ready figure.
FAQ
How is child support calculated in North Dakota?
North Dakota is NOT an income-shares state -- the child support amount is based entirely on the paying (obligor) parent's OWN monthly net income and the number of children. The other parent's income is never part of the calculation. Look up the paying parent's net monthly income and the number of children in the official Child Support Guidelines schedule to get the base support amount. If the paying parent's court-ordered parenting time exceeds 100 overnights per year ("Extended Parenting Time"), the amount is reduced by a credit factor of (365 minus overnights times 0.32), divided by 365. This calculator does not model Equal Residential Responsibility (when both parents have exactly equal time, a different cross-offset calculation applies) or Split Custody (each parent primary for at least one different child).
Does North Dakota consider both parents' incomes?
No. Unlike most states, North Dakota's guideline schedule (NDAC 75-02-04.1-10) is based entirely on the paying (obligor) parent's own net monthly income -- the other parent's income does not factor into the base calculation at all.
What is North Dakota's Extended Parenting Time Adjustment?
When the paying parent's court-ordered parenting time exceeds 100 overnights per year, the guideline amount is reduced using the formula (365 - overnights x 0.32) / 365 -- more overnights produce a larger reduction. This adjustment doesn't apply when the parents have exactly Equal Residential Responsibility, which uses a separate calculation instead.
What income does North Dakota use -- gross or net?
Net income: gross income minus federal and North Dakota state income taxes, FICA, mandatory retirement contributions, union dues, and health insurance premiums for the children.
Methodology & Source
Formula model: nd obligor schedule. Effective 2023-07-01, guideline version 2023-ND-v1, last reviewed 2026-07-13.
Official source: North Dakota Legislative Council — N.D. Admin. Code § 75-02-04.1-10 (N.D. Admin. Code § 75-02-04.1-10).
North Dakota's guideline amount is based on the OBLIGOR'S OWN monthly net income alone -- the other parent's income is never part of the calculation (this is not an income-shares state). This calculator does not model: Equal Residential Responsibility (NDAC 75-02-04.1-08.2, when both parents have exactly equal time, an entirely different cross-offset calculation); Split Custody (75-02-04.1-03, each parent primary for at least one different child); or the multiple-family adjustment for other children the obligor supports (75-02-04.1-06.1). Above $24,900/month net income, North Dakota's guideline schedule does not provide an automatic extension -- courts determine the amount case-by-case.
Guideline figures transcribed from the primary source above and cross-checked against North Dakota's official calculator/worksheet for multiple test scenarios — see our verification methodology.