Idaho uses the Income Shares model — both parents’ gross incomes are combined. Updated for 2026 — covers 50/50 custody, arrears, modifications and Idaho child support laws.
BothParents Income
NoneIncome Cap
18Age Support Ends
5%Arrears Interest
🥔 Idaho Income Shares Model
Idaho Child Support Calculator 2026
Idaho uses the Income Shares model — both parents’ gross incomes are combined.
ℹIdaho uses gross income — Gross = total income before any deductions.
$
$0$20k
$
$0$20k
$
$
Estimated Monthly Child Support
$0
per month
Annual Total
$0
Combined Income
—
Until Age
18
* Estimate using official Idaho income shares formula. Courts may deviate based on special circumstances. Consult a Idaho family law attorney for your specific situation.
🥔 How Idaho Calculates Child Support
ModelIncome Shares — both parents’ combined gross income
Income CapNo set cap — courts use discretion
Minimum Order$50/month minimum regardless of income
Arrears Interest5% annual interest on unpaid arrears
Idaho Key RuleIdaho uses the Income Shares model based on both parents’ combined gross income
Additional InfoIdaho’s child support guidelines use comprehensive published schedule tables
⚖ 50/50 Custody in Idaho
Does Child Support Apply With 50/50 Custody in Idaho?
In most cases, yes. Idaho does not automatically eliminate child support with equal parenting time.
✓General rule: With 50/50 custody, the higher-earning parent typically pays the lower-earning parent. The amount is reduced vs sole custody but rarely reaches $0.
$
$0$15k
$
$0$15k
Estimated Monthly Payment
$0
per month
Without Custody Adj.
$0
Custody Reduction
$0
Net Payment
$0
* 50/50 custody calculations are complex. This is an approximation. Consult a Idaho family law attorney for exact figures.
📋 Idaho Arrears Calculator
Idaho Child Support Arrears Calculator
Calculate total back child support including 5% annual interest Idaho applies to unpaid arrears.
⚠Idaho charges 5% annual interest on all unpaid child support arrears.
$
$
$
Total Arrears Owed (with 5% Interest)
$0
including Idaho 5% annual interest
Base Arrears
$0
Interest Accrued
$0
Clear in 1 Year
$0
Clear in 2 Years
$0
Clear in 3 Years
$0
Support Ends Age
18
* Idaho applies 5% annual interest to unpaid child support. There is generally no statute of limitations on child support debt.
🔄 Modification Estimator
Idaho Child Support Modification
Estimate your new payment and check if you qualify for a modification in Idaho.
ℹModification rule: Most states allow modification when the new amount differs by 15-20% or $100/month, OR when there is a material and substantial change in circumstances (job loss, new child, custody change).
$
36+ months = eligible for routine review
$
Estimated New Monthly Payment
$0
per month
Current Order
$0
New Calculated
$0
Difference
$0
% Change
0%
Likely Qualifies?
—
Time Since Order
—
* Qualification estimate only. Consult a Idaho family law attorney before filing.
📜 Updated 2026
Idaho Child Support Laws 2026
Key rules, age cutoffs and what you need to know in Idaho.
FORMULA How Idaho Calculates Child Support
Idaho Code Section 32-706 and Idaho Child Support Guidelines govern calculations. Idaho uses published schedule tables. Courts may deviate with written explanation.
AGE When Does Child Support End in Idaho?
Child support in Idaho ends when the child turns 18 — or high school graduation, whichever is later. Support also ends upon the child’s death, marriage or emancipation. Important: In most cases support does not stop automatically — you need a court order. Stopping payments without a court order creates arrears even after the child reaches the cutoff age.
INTEREST Arrears Interest in Idaho
Idaho charges 5% annual interest on unpaid child support arrears. There is generally no statute of limitations on child support debt.
ENFORCEMENT Idaho Child Support Enforcement
Idaho has broad enforcement powers including wage garnishment, tax refund interception, driver’s license suspension, professional license suspension, passport denial, and credit bureau reporting. Criminal charges may apply for significant or long-term non-payment.
MODIFY Modifying Child Support in Idaho
Child support can be modified in Idaho when there is a material and substantial change in circumstances — typically a significant income change, job loss, new children from another relationship, or change in custody. Most states also allow a periodic review every 3 years. File a petition with the court — private agreements to change support are not legally enforceable.
📅 Idaho Payment Calendar
Child Support Payment Calendar 2026
Generate your personal payment schedule and track payments month by month.
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Monthly Total
$0
Annual Total
$0
Next Payment
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Days Until Due
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Payments Remaining
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Marked Paid
$0
* Click Mark as Paid to track payments. Always keep payment receipts.
Need a Idaho Family Law Attorney?
This calculator provides estimates. For filing, modifying or enforcing a child support order, connect with a local family law attorney.