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 Iowa family law attorney.
ℹ️ Iowa uses the Percentage of Income — Iowa uses a percentage of the non-custodial parent's net monthly income.
How Child Support Works in Iowa
Iowa 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 = 17%, 2 = 25%, 3 = 29%, 4 = 31%, 5+ = 35%.
How Iowa Compares to Other States
See how Iowa's child support rules compare to other states.
| State | Formula | Support Ends | Arrears Rate | Mod. Threshold |
|---|---|---|---|---|
| ★ Iowa (you) | Percentage of Income | 18 | 10% | 10% |
| Delaware | Melson Formula | 18 | 5% | 10% |
| Idaho | Percentage of Income | 18 | 5% | 15% |
| 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% |
Showing 8 comparison states. View all 50 states →
Frequently Asked Questions
How is child support calculated in Iowa?
Iowa uses the Percentage of Income model. Iowa uses a percentage of the non-custodial parent's net monthly income.
When does child support end in Iowa?
Child support generally ends when the child turns 18 in Iowa.
Can I modify child support in Iowa?
Yes. Iowa requires a 10% or greater change in income to qualify. Use our modification checker →
Does 50/50 custody eliminate child support in Iowa?
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 Iowa?
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.