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Idaho Child Support Calculator & Guidelines (2026)

Estimate Idaho child support under Idaho R. Fam. L. P. 126 — Income Shares model, current caps and percentages, with a step-by-step worked example.

This state uses a worksheet/table-based guideline that cannot be fully reproduced in a simplified tool. The range above is an approximation — use the official state calculator for the guideline figure. Official state calculator →

Estimate Your Child Support

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Idaho Child Support Rules at a Glance

Guideline model Income Shares
Income basis Gross (pre-tax) income
How it works Both parents’ incomes are combined, a basic obligation is taken from the state’s official schedule, and each parent pays in proportion to their share of combined income.
Statute / rule Idaho R. Fam. L. P. 126
Parameters verified pending full verification (model and statute confirmed)

Worked Example: $5,000 + $3,000 Income, Two Children

  1. Paying parent’s monthly income: $5,000 - other parent’s: $3,000 - two children, primary custody.
  2. Simplified income shares estimate: combined income $8,000 x 24% (two children) = $1,920 basic obligation.
  3. Paying parent’s share: 62.5% of $1,920 = $1,200 - shown as a range of $1,020-$1,380 to reflect state schedule differences.
  4. For the exact figure use the official state calculator linked below - this state’s guideline uses its own obligation schedule.

Result: $1,020 - $1,380 per month (simplified range)

Idaho Child Support FAQ

How is child support calculated in Idaho?

Idaho uses the income shares model under Idaho R. Fam. L. P. 126: both parents’ incomes are combined, a basic obligation is determined, and each parent is responsible for their proportional share. The paying parent’s share becomes the support order.

Does Idaho use gross or net income for child support?

Idaho calculates support on gross (pre-tax) income as defined in Idaho R. Fam. L. P. 126.

Can a Idaho court order more or less than the guideline amount?

Yes. The guideline amount under Idaho R. Fam. L. P. 126 is presumptive, not absolute - courts may deviate with written findings for factors like extraordinary medical or educational needs, other children supported, or very high income beyond the guideline range.

How do I apply for or modify child support in Idaho?

Apply through the Idaho child support agency or the family court in your county. Existing orders can be modified on a substantial change in circumstances - typically a significant income change, job loss, or a change in custody. The official calculator/worksheet is linked on this page (www.idahochildsupport.com).

Official Idaho Resources

Related Calculators & States

About This Estimate

Estimate only — not legal advice. Based on Idaho guidelines (Idaho R. Fam. L. P. 126). Courts may deviate. For an official figure use the official Idaho calculator.