Calculate Child Support
Before taxes. Include wages, self-employment, bonuses.
0 = no custody · 91 = 25% · 182 = 50/50 · 365 = full custody
$0
estimated monthly support payment
⚠️ Estimate only. Actual court-ordered amounts may vary. Verify with a licensed Idaho family law attorney.
ℹ️ Idaho uses the Percentage of Income — Idaho uses a percentage of the non-custodial parent's gross income.
How Child Support Works in Idaho
Idaho uses the Percentage of Income to determine child support obligations.
The Percentage of Income model applies a fixed percentage of the non-custodial parent's income based on the number of children. Rates: 1 child = 20%, 2 = 22%, 3 = 24%, 4 = 26%, 5+ = 28%.
How Idaho Compares to Other States
See how Idaho's child support rules compare to other states.
| State | Formula | Support Ends | Arrears Rate | Mod. Threshold |
|---|---|---|---|---|
| ★ Idaho (you) | Percentage of Income | 18 | 5% | 15% |
| Delaware | Melson Formula | 18 | 5% | 10% |
| Michigan | Income Shares | 18 | 5% | 10% |
| Ohio | Income Shares | 18 | 5% | 10% |
| Alaska | Percentage of Income | 18 | 6% | 15% |
| Florida | Income Shares | 18 | 6% | 15% |
| Louisiana | Income Shares | 18 | 6% | 25% |
| New Hampshire | Income Shares | 18 | 6% | 15% |
| North Dakota | Income Shares | 18 | 6% | 10% |
Showing 8 comparison states. View all 50 states →
Frequently Asked Questions
How is child support calculated in Idaho?
Idaho uses the Percentage of Income model. Idaho uses a percentage of the non-custodial parent's gross income.
When does child support end in Idaho?
Child support generally ends when the child turns 18 in Idaho.
Can I modify child support in Idaho?
Yes. Idaho requires a 15% or greater change in income to qualify. Use our modification checker →
Does 50/50 custody eliminate child support in Idaho?
Not automatically. The higher-earning parent typically still pays support with 50/50 custody. See our 50/50 guide →
What income is used for child support in Idaho?
Income includes wages, self-employment, bonuses, rental income, unemployment benefits, disability payments, and Social Security. Courts may impute income if a parent is voluntarily underemployed.