How Is Child Support Calculated in North Dakota

North Dakota is one of only nine states that calculates child support as a straight percentage of the paying parent's net income, rather than combining both parents' incomes into a shared formula. That single design choice shapes almost everything about how the number gets calculated — and where pro se litigants get it wrong.

The Percentage-of-Income Model

Under N.D. Admin. Code § 75-02-04.1, North Dakota's guidelines focus primarily on the net income of the obligor — the parent who will be paying support. The court cannot enter a divorce decree involving minor children unless support has been calculated strictly according to these official guidelines. There's no discretion to eyeball a number that "feels fair"; the guideline calculation controls unless a party successfully argues for a deviation.

The Official Calculator — and Its Windows-Only Quirk

To run the calculation, the Child Support Division of the Department of Health and Human Services maintains an official Guidelines Calculator: a macro-enabled Excel workbook, not a web form. To use it, you have to set the state agency's portal as a trusted website and enable advanced Excel macros — steps that trip up a surprising number of filers unfamiliar with Excel security settings. The state explicitly warns that the tool has known compatibility issues on Apple/Mac systems and should be run on Windows. If you're a Mac user, plan to borrow a Windows machine or run it in a virtual environment before you sit down to do your calculation.

The active version of the calculator is updated annually — the current version took effect January 1, 2026 — so always confirm you're using the live file from the HHS website rather than a cached copy or a version linked from a third-party site.

The Imputation Trap for Unemployed or Underemployed Parents

If a parent is unemployed or underemployed, North Dakota doesn't let them report zero or minimal income. Under N.D. Admin. Code § 75-02-04.1-07, the court is required to impute income based on the greatest of three statutory markers:

1. A monthly amount equal to 167 times the federal hourly minimum wage — currently $1,210.75 gross per month at the $7.25 federal minimum
2. Six-tenths of North Dakota's statewide average earnings for someone with a similar work history and occupational background
3. 90% of the parent's highest average gross monthly earnings across any consecutive 12-month period within the current and prior two calendar years

The court must apply whichever of these three produces the largest imputed figure — not whichever is most convenient or most sympathetic. In Updike v. Updike (2022), the North Dakota Supreme Court reaffirmed that judges have no discretion to pick a lower option. Self-represented parents drafting their own proposed support terms frequently miss this rule entirely, and judges routinely reject support figures that don't account for it.

The 180-Night Parenting Time Offset

A common misconception among self-represented parents is that splitting parenting time roughly equally automatically cancels out child support. It doesn't work that way in North Dakota. Parenting schedules that cross the 180-overnight threshold trigger a specialized offset calculation within the guidelines — but the offset is a formula adjustment, not an automatic elimination of the obligation. Parents who assume 50/50 parenting time means no support changes hands are often surprised by the actual guideline output.

Health Insurance and Additional Expenses

The guideline percentage covers baseline support, but North Dakota's calculation also accounts for who carries the children's health insurance and how extraordinary expenses — uninsured medical costs, childcare needed for a parent to work, or costs tied to a child's special needs — get allocated between parents. These figures feed directly into the Excel workbook alongside income data, so gathering health insurance premium statements and typical childcare costs before you sit down to run the calculator saves you from having to stop mid-calculation to track down a number.

Deviating From the Guideline Amount

The guideline output isn't always the final word. A court can deviate from the calculated amount if a party shows the guideline figure would be unjust or inappropriate in their specific circumstances — for example, unusually high travel costs tied to a long-distance parenting schedule, or a child's documented extraordinary medical or educational needs beyond what the standard formula anticipates. Deviation requests require the requesting parent to make an affirmative showing to the court; the guideline amount remains the presumptive, default figure unless successfully challenged with evidence.

Why the Calculation Matters Beyond the Number

Because the court is statutorily barred from signing a decree with minor children until the guideline calculation is complete and correctly documented, getting this step wrong doesn't just risk an unfair number — it can hold up your entire case. A rejected support calculation sends you back to redo the Excel workbook, gather updated pay stubs, and potentially wait for the next available court review.

Getting the Inputs Right Before You Run the Calculator

The calculator is only as accurate as what you feed it — three recent paystubs, complete tax returns, and documentation of any imputed income if one parent is underemployed. Gathering these in the Rule 8.3 joint meeting (required within 30 days of service) before you attempt the calculation saves you from having to redo the whole exercise once real numbers surface.

The North Dakota Divorce Filing Process Guide includes a plain-language walkthrough of the guidelines calculator, the imputation rules, and how the 180-night offset actually works, so you can arrive at the Rule 8.3 meeting with a defensible number instead of a guess. Find it at /us/north-dakota/filing-process/.

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