Child Support in Idaho: How It's Calculated
Idaho uses the Income Shares Model to determine child support obligations. This guide walks through how the formula works, what factors Idaho courts consider, and how to modify or enforce an order — with links to official Idaho resources.
Income Shares Model in Idaho
Idaho uses the Income Shares Model under the Idaho Child Support Guidelines (IRCP Rule 120). Both parents' gross incomes are combined to determine a total support obligation from the schedule, then allocated proportionally.
Idaho's guidelines provide an adjustment for shared physical custody when the non-primary parent has the child for more than 25% of the year (approximately 91 overnights). Health insurance and work-related childcare are added to the base support before allocation. Idaho courts may deviate from the guidelines when applying them would be unjust or inappropriate.
Key Factors Idaho Courts Consider
- Both parents' gross monthly income
- Number of children
- Parenting time — 25%+ time with non-primary parent triggers shared custody adjustment
- Child's health insurance premium
- Work-related childcare expenses
- Other extraordinary expenses
- Existing support obligations for other children
Official Idaho Resources
Get an accurate number from an official source
Child support calculations are complex and fact-specific. For an accurate figure, use Idaho's official worksheet or consult a licensed family law attorney. This guide explains the framework — it does not produce a binding calculation.
Step-by-Step: How Idaho's Formula Works
Here is how Idaho applies the Income Shares Model to calculate a child support obligation, step by step:
1. Determine each parent's income
Idaho starts by calculating each parent's income — gross income (before taxes). The specific definition of income is set by Income Shares Model.
2. Combine incomes and find the basic obligation
Both parents' incomes are combined and compared to Idaho's child support schedule. The schedule produces a basic child support obligation based on combined income and the number of children.
3. Add health insurance and childcare costs
Health insurance premiums paid for the child and work-related childcare expenses are added to the basic obligation before it is divided between parents.
4. Divide proportionally based on income share
The total obligation is allocated between the parents in proportion to each parent's share of combined income. The parent with the higher income share bears a larger portion of the obligation.
5. Apply parenting time credits
Parenting time — 25%+ time with non-primary parent triggers shared custody adjustment shared physical custody when the non-primary parent has the child for more than 25% of the year (approximately 91 overnights).
Document Everything for Your Idaho Case
Idaho courts rely on documented records — parenting time logs, expense receipts, and payment histories. ReplyCalmly helps you track all of it and generate organized, exportable reports.
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