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Idaho Child Support Calculator (2026)

In Idaho, child support is based on both parents' combined income and the number of children. The total is split between you based on how much each parent earns, and parenting time can change the amount. Use the free calculator below for an instant estimate.

How it's calculated
Both parents' income combined
Income used
Before-tax (gross)
Last updated
2025
Verified
2026-05-31

Source: ID Guidelines (IRFLP 120, formerly IRCP 126)

Calculate Your Idaho Child Support

Free estimate — official Idaho guidelines

Include wages, salary, bonuses, and other income

How Much Is Child Support in Idaho?

If you make $60,000 a year in Idaho, child support for 1 child is estimated at $639 per month ($7,668 per year). This assumes the other parent earns approximately $36,000/year. Actual amounts depend on both parents' incomes, custody time, and add-on expenses (child care, health insurance).

$1,000/week ($52,000/year): approximately $588/month for 1 child.

Idaho Child Support Estimates by Income (2026)

Annual Income 1 Child 2 Children 3 Children
$40,000/yr $489/mo $728/mo $854/mo
$50,000/yr $573/mo $849/mo $1,000/mo
$60,000/yr $639/mo $945/mo $1,121/mo
$70,000/yr $687/mo $1,018/mo $1,219/mo
$80,000/yr $729/mo $1,085/mo $1,311/mo
$100,000/yr $812/mo $1,219/mo $1,495/mo
$120,000/yr $896/mo $1,352/mo $1,678/mo

Estimates assume the other parent earns 60% of your income. Actual amounts vary. Compare all states →

How Child Support Is Calculated in Idaho

Factors That Affect Child Support in Idaho

Both parents' gross monthly incomes
Number of children
Health insurance premiums for the children
Work-related child care costs
Parenting time and custody arrangement
Tax benefits related to the children
Other child support or alimony obligations
Extraordinary educational or medical expenses
Technical details and legal basis

Idaho uses the Income Shares model (ID Guidelines (IRFLP 120, formerly IRCP 126)) to calculate child support. This model combines both parents' incomes to determine the total obligation, then divides it proportionally based on each parent's share.

Important Notes for Idaho

  • Idaho uses the Income Shares model, combining both parents' gross incomes to determine the total child support obligation.
  • Each parent's share is proportional to their percentage of the combined gross income.
  • Idaho considers additional expenses including health insurance, work-related child care, and extraordinary expenses for the children.
  • The court may deviate from the guidelines when strict application would produce an unjust result.

Example Calculation

Scenario: Parent A earns $5,000/month, Parent B earns $3,000/month, 2 children.

Step 1: Combined income: $8,000

Step 2: Parent A's share: $5,000 / $8,000 = 62.5%

Step 3: Look up basic obligation for $8,000 combined and 2 children.

Step 4: Multiply by Parent A's share (62.5%).

Adjustments for health insurance, child care, and parenting time may apply.

Key Facts: Child Support in Idaho

  • Idaho uses the Income Shares model under IRFLP 120 (formerly IRCP 126), basing child support on both parents' combined gross income.
  • The basic child support obligation for 1 child ranges from approximately $178/month at $1,000 combined income to $2,467/month at $36,667 combined monthly income (IRFLP 120, July 2025 amendment).
  • Each parent pays their proportional share of the total obligation based on their percentage of the combined gross income.
  • Idaho includes adjustments for health insurance, work-related child care costs, and extraordinary expenses.
  • Courts may deviate from the guidelines when strict application would produce an unjust or inappropriate result.

Idaho Child Support FAQ

How is child support calculated in Idaho?
Idaho uses the Income Shares model under IRFLP 120 (formerly IRCP 126). Both parents' gross incomes are combined, and a basic child support obligation is determined from the guidelines schedule. Each parent pays their proportional share based on their percentage of the combined income. Adjustments are made for health insurance, child care, and parenting time.
What income is used for Idaho child support?
Idaho uses gross income from all sources, including wages, salaries, commissions, bonuses, self-employment income, interest, dividends, rental income, pensions, Social Security, and workers' compensation. The court may impute income to a parent who is voluntarily unemployed or underemployed.
Does shared custody affect child support in Idaho?
Yes, Idaho considers the parenting time arrangement in calculating child support. When both parents share significant custodial time, the guidelines provide for adjustments to the basic support obligation to reflect the direct costs each parent incurs during their parenting time.
Can Idaho courts deviate from child support guidelines?
Yes, Idaho courts may deviate from the guidelines when strict application would be unjust or inappropriate. Factors for deviation include the child's special needs, the financial resources of each parent, tax consequences, and any other relevant circumstances.
How long does child support last in Idaho?
In Idaho, child support generally continues until the child turns 18. If the child is still attending high school at age 18, support continues until the child completes high school or turns 19, whichever occurs first. Support may continue for children with disabilities.
Is this Idaho child support calculator updated for 2026?
Yes. This calculator uses Idaho's IRFLP 120 guidelines (formerly IRCP 126), including the June 3, 2025 amendment that raised the income cap to $440,000 per year ($36,667 per month). We last verified every schedule figure against the official Idaho Supreme Court source on May 31, 2026.
How much is child support for 1 kid in Idaho?
For 1 child in Idaho, the basic obligation depends on combined gross income. At $5,000/month combined gross income, the obligation is $742. At $10,000/month, it's $1,133. The paying parent covers only their proportional share of this amount based on their percentage of the combined income.
How much is child support for 2 kids in Idaho?
For 2 children in Idaho, the basic obligation at $5,000/month combined gross income is $1,108. At $10,000/month, it's $1,683. As with 1 child, each parent pays their proportional share of this amount based on their percentage of the combined gross income.
Does this Idaho calculator include alimony or spousal support?
No. This calculator estimates child support only. Alimony (spousal support) in Idaho is decided separately by the court using different factors, and is not part of this child support calculation.
What factors determine child support in Idaho?
Idaho child support is based on both parents' gross monthly incomes and the number of children, using the Income Shares model. Courts also consider health insurance premiums, work-related child care costs, parenting time, tax benefits related to the children, other support or alimony obligations, and extraordinary educational or medical expenses.

About This Calculator

Uses the official ID Guidelines (IRFLP 120, formerly IRCP 126) (2025 guidelines). Last verified: 2026-05-31.

Disclaimer: Estimates only, not legal advice. Actual amounts are set by Idaho courts. Full disclaimer.

Methodology: Income Shares model per ID Guidelines (IRFLP 120, formerly IRCP 126).

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