Idaho Child Support
Estimate for Idaho
Idaho uses the Income Shares model.
Official schedule: Idaho Rules of Family Law Procedure Rule 120 — Basic Monthly Child Support Guidelines Schedule (eff. 7/1/2025) (2025)
View calculation breakdown
| Combined parental income | $9,000 |
|---|---|
| Total basic obligation (schedule) | $1,602 |
| Obligor income share | 55.6% |
| Obligor basic obligation | $890 |
| Estimated monthly support | $890 |
How the basic obligation splits between parents
Estimated monthly support by number of children
§ How Idaho calculates support
Idaho uses the Income Shares model under Idaho Rules of Family Law Procedure, Rule 120 (Idaho Child Support Guidelines), with a rebuttable presumption under Idaho Code § 32-706. The guideline uses each parent's gross income (before taxes) less specific adjustments (e.g., preexisting support orders, child's health insurance) to reach Guidelines Income. A minimum presumption of $50/month per child applies for very low incomes, and a parenting-time credit applies at roughly 25% overnights (91+ nights). Courts must state the guideline amount and reasons on the record to deviate.
Content verified against official sources on 2026-08-09.
✦ How to open or modify a case in Idaho
- Apply through Idaho Child Support Services (DHW) or file in court.
- Establish paternity if unmarried (voluntary acknowledgment or genetic testing).
- Both parents provide financial information; complete the Child Support Worksheet under Rule 120 (gross income minus adjustments).
- The court enters an order based on the guideline schedule; deviations require the court to state the guideline amount and reasons on the record.
- Payments are processed via income withholding; CSS enforces.
- To modify, file a motion; a change in the guideline amount can be a substantial material change of circumstances.
◈ Illustrative examples
Scenario: Parent A gross $5,000/mo; Parent B $3,500/mo; combined $8,500/mo; two children; child health insurance $200/mo; childcare $400/mo.
Walk-through: Parent A = 59% of combined gross. Look up the basic obligation for $8,500 combined and two children on the Rule 120 schedule; add-ons = $600. Parent A's share ≈ 0.59 × (basic obligation + $600).
Takeaway: Idaho applies the income-shares formula to gross income, with the paying parent responsible for their income percentage of the obligation plus add-ons.
Scenario: Paying parent has 100 overnights/year (above the ~25% threshold).
Walk-through: A parenting-time credit reduces the transferred amount to reflect the paying parent's direct spending during visits.
Takeaway: More overnights lower the cash support, but the custodial parent's share is presumed spent directly on the child.
? Frequently asked questions
↗ Official policy & agency links
Sources verified: https://healthandwelfare.idaho.gov/services-programs/children-families-older-adults · https://isc.idaho.gov/rules-procedure/print/irfl/120 · Idaho Code § 32-706; IRFLP Rule 120