How to change child support in Iowa
How and when to ask for a new amount, with a review letter.
Checked against official sources: Oct 25, 2026.
Short answer
To modify an order means to change the amount by a new order. In court, a substantial change of circumstances exists when the order differs by 10% or more from the current guidelines amount, or when a health plan is available and the order has no medical support.
- Agency review
- Every 3 years if a parent asks (federal law)
- First form
- Iowa Judicial Branch court forms
The rule for changing support in Iowa
In court, a substantial change of circumstances exists when the order differs by 10% or more from the current guidelines amount, or when a health plan is available and the order has no medical support. CSS Review and Adjustment: more than 24 months since the order was entered or last reviewed, and CSS asks the court to change it if the new amount differs by more than 20%. Before 24 months, CSS can do an Administrative Modification if a parent's net income changed by 50% or more, among other reasons.
Law: Iowa Code 598.21C(2)
Can I ask for a change? Check your situation
Asking for a review in Iowa
Either parent can ask CSS for a Review and Adjustment or an Administrative Modification (support must still be due more than 12 months from the request), or file a petition in district court. You may have to pay service costs, often $55 or more per person served in Iowa. Past-due support is not changed. Parents can also agree in writing to a cost-of-living change.
Write to the child support agency to ask for a review: Ask the agency to review (change) your order
Recent changes in Iowa
Iowa Supreme Court adopted revised Child Support Guidelines by order of September 29, 2025, effective January 1, 2026, for cases pending on or after that date. A 2025 law ended court-ordered postsecondary education subsidies for orders entered or pending on or after July 1, 2025.
Law: 2025 Acts ch. 57
Incarceration and changes
State guidelines may not treat time in jail or prison as choosing not to work, when support is set or changed.
Law: 45 CFR 302.56(c)(3)
In nearby states
Your next steps in Iowa
Read your current order
The date of the order matters for the rule.
Compare with the rule
In Iowa: In court, a substantial change of circumstances exists when the order differs by 10% or more from the current guidelines amount, or when a health plan is available and the order has no medical support.
Show the change
Pay stubs, a job loss letter or proof of new costs show what changed.
File the request
Request a review from Iowa Department of Health and Human Services, Child Support Services (CSS) (1-888-229-9223) · Apply online
Get help
Free help: Iowa Legal Aid.
Free help in Iowa
Questions about changing support in Iowa
How often can I ask for a change in Iowa?
In court, a substantial change of circumstances exists when the order differs by 10% or more from the current guidelines amount, or when a health plan is available and the order has no medical support. CSS Review and Adjustment: more than 24 months since the order was entered or last reviewed, and CSS asks the court to change it if the new amount differs by more than 20%. Before 24 months, CSS can do an Administrative Modification if a parent's net income changed by 50% or more, among other reasons.
How do I ask to change child support in Iowa?
Either parent can ask CSS for a Review and Adjustment or an Administrative Modification (support must still be due more than 12 months from the request), or file a petition in district court. You may have to pay service costs, often $55 or more per person served in Iowa. Past-due support is not changed. Parents can also agree in writing to a cost-of-living change.