Iowa Child Support Calculator

How Iowa Calculates Child Support

To calculate child support in Iowa, the court combines both of your and the other parent's net monthly incomes to determine a total support obligation based on a state schedule. This total amount is then divided between you and the other parent based on your individual percentage of the combined income. The parent with less parenting time typically pays their share to the other parent, as governed by the Iowa Court Rules, Chapter 9.

Shared Custody & Parenting Time Adjustments

In Iowa, a specific shared physical care calculation applies when a parent has physical care of the child for at least 128 overnights per year. Under Iowa Court Rule 9.14, this adjustment increases the basic support obligation by 50% and then credits each parent for the percentage of time they have the child. This method recognizes the duplicated expenses incurred by both parents in a shared custody arrangement.

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✓ Verified for 2026 Guidelines • Reviewed October 2026 by Harmoney

Iowa Child Support Guidelines at a Glance

Guideline Model Income Shares Model
Governing Legal Authority Iowa Court Rules Chapter 9
Shared Custody Threshold 128 Overnights
Age Support Ends Age 18 (or 19 if still in high school)
Modification Standard 10% Change in Support Amount

Frequently Asked Questions About IA Child Support


At what age does child support end in IA?

Child support in Iowa ends when a child turns 18, but it can continue until age 19 if the child is still attending high school full-time and is expected to graduate. This rule is established under Iowa Code § 598.1(9), which defines the conditions for the termination of a support obligation.

How is child support calculated if one parent is unemployed in IA?

If a parent is voluntarily unemployed or underemployed, an Iowa court will 'impute' or assign income to them based on their earning capacity, work history, and qualifications. Governed by Iowa Court Rule 9.5(5), this practice ensures that support is calculated fairly based on a parent's potential to earn, not just their current income.

How do I modify a child support order in IA?

You can modify a child support order in Iowa by showing a substantial change in circumstances, which is legally presumed if the current guidelines would result in a 10% or greater change in the support amount. This standard is outlined in Iowa Code § 598.21C, allowing either parent to petition the court for a review of the existing order.

Does IA child support cover college expenses?

Yes, Iowa courts can order a divorced parent to contribute to post-secondary education expenses for a child between the ages of 18 and 22. Under Iowa Code § 598.21F, the court considers factors like the child's aptitude and the parents' financial ability when deciding whether to order a post-secondary education subsidy.

How does IA handle health insurance and childcare costs?

Health insurance premiums and necessary work-related childcare costs are added to the basic child support obligation and divided between the parents in proportion to their respective net incomes. Iowa Court Rules 9.12(1) and 9.12A direct how these additional expenses are to be calculated and allocated as part of the total child support award.