Reviewed for current 2026 law
Idaho Child Support Calculator 2026
Apply all current marginal income bands for primary or shared parenting time.
Reviewed by SupportDecode Editorial Team Page content reviewed Sources Methodology Update log
child support calculator
Estimated monthly child support: $945.00
The paying parent pays this amount to the receiving parent each month.
| Line item | Amount |
|---|---|
| Monthly basic support from marginal scheduleIdaho Rules of Family Law Procedure Rule 120, Child Support Guidelines (Idaho Supreme Court) | $1,512.00 |
| Paying parent proportional shareIdaho Rules of Family Law Procedure Rule 120, Child Support Guidelines (Idaho Supreme Court) | $945.00 |
Assumptions
- Income is monthly Guidelines Income after only Rule 120 adjustments.
- Tax-benefit credits, health expenses, child care, transportation, other-child deductions, and deviations are excluded.
- The receiving parent has primary parenting time.
- Combined income is within the published schedule.
Continue with this income in the PayDecode take-home calculator
PayDecode is a separate site. The link may not carry your numbers over; if its form opens blank, enter the income there again.
Estimate only. The court or state agency calculation controls.
Idaho guidelines, effective 2025-07-01.
Idaho uses marginal annual-income bands
Rule 120 applies a different percentage to each successive combined Guidelines Income band, then allocates the monthly total by income share.
When each parent has more than 25% of overnights, the total is multiplied by 1.5, weighted for time, and offset.
The published schedule reaches $440,000 combined annual income. Above it, the scheduled amount is not a limitation.
Worked example: two children
- Apply the two-child percentage to each occupied annual band.
- Round the total basic obligation to a monthly dollar.
- Allocate the payer share from the parents relative Guidelines Income.
The steps above follow the calculation method described on our methodology page.
Use Guidelines Income, not net pay
Start with gross income and apply only Rule 120 adjustments.
What this estimate includes
- All 11 marginal bands for one through five children
- Primary and shared physical custody
- High- and low-income boundaries
What it leaves out
- Tax-benefit adjustment
- Health, child care, transportation, and other-child adjustments
- Split physical custody
Idaho child support calculator FAQs
Is Idaho a flat-percentage state?
No. Successive portions of combined annual income use different percentages.
When does shared custody apply?
When each parent has more than 25% of annual overnights.
What happens below $800 monthly payer income?
The court carefully reviews income and living expenses; the $50-per-child minimum is rebuttable, so the calculator stops.
What happens over $440,000?
The scheduled amount through that income is calculated, but it does not limit additional support.
Are tax benefits included?
No. Idaho has a separate dependency-tax-benefit adjustment.
Can a court deviate?
Yes, with the ordinary guideline amount stated and reasons for departure.
Official sources
Official sources last verified: .
- Idaho Rules of Family Law Procedure Rule 120, Child Support Guidelines
Idaho Supreme Court Last checked
- 15 U.S.C. 1673 (CCPA garnishment limits: 50/55/60/65% for support)
U.S. Congress (text via Cornell LII mirror) Last checked
Changelog: page reviewed . Material changes appear in the update log.