Iowa Child Support Calculator

Estimate Iowa child support for 2026 using the Income Shares guideline model under Iowa Ct. R. ch. 9 (Iowa Child Support Guidelines). Enter both parents' incomes and the parenting-time split to see what you may owe or receive.

Iowa follows the Income Shares model under the Iowa Child Support Guidelines (Iowa Court Rules, Chapter 9). The court combines both parents' monthly gross incomes, looks up the basic support obligation on the state's guideline schedule for that income level and number of children, then prorates the obligation between the parents according to each parent's percentage share of the combined income.

Iowa adjusts the support number for parenting time through a shared-care approach built into the Iowa Child Support Guidelines. An extraordinary visitation credit applies when the paying parent's overnights with the child exceed 127 per year, which can lower the obligation. Below that level, parenting time usually does not change the calculated amount. The exact credit is set by the guideline schedule and worksheet, not by the on-page estimate.

The cost of dependent health and dental insurance for the child is built into the Iowa calculation. Under the guidelines, the premium for the child's coverage is factored in and divided between the parents in proportion to their income shares. Iowa also subtracts the cost of dependent health insurance when determining a parent's net monthly income, so coverage shows up in more than one place in the math.

Work-related child care is treated as an adjustment under the Iowa Child Support Guidelines. Reasonable child care expenses, such as daycare a parent pays so they can work, are added to the support calculation and split between the parents according to each parent's percentage share of combined income. Keep records of what you actually pay, because the court and CSRU work from documented, reasonable amounts rather than estimates.

Iowa courts start from the guideline number and treat it as the correct amount in most cases. A judge may vary from the guideline figure, but variance requires written reasons explaining why the guideline amount would be unjust or inappropriate for the child. The parent asking for a different number carries the burden of showing the deviation is justified. Because the guideline amount controls unless overridden in writing, deviations are the exception, not the rule.

Frequently asked questions

How is child support calculated in Iowa?

Iowa uses the Income Shares model under the Iowa Child Support Guidelines, found in Iowa Court Rules, Chapter 9. The court combines both parents' incomes, looks up the basic support obligation on the state guideline schedule for that income level and number of children, then prorates that obligation by each parent's percentage share of the combined income. Iowa works from net monthly income, which is gross income from all sources minus taxes, FICA, mandatory retirement, union dues, dependent health insurance, and existing court-ordered support. The calculator on this page is an estimate only, not legal advice. The official guideline worksheet and a licensed attorney control the actual number.

Is there an official Iowa child support worksheet, and does it control my case?

Yes. The controlling document is the guideline worksheet under the Iowa Child Support Guidelines in Iowa Court Rules, Chapter 9, and Iowa also offers an official online estimator through the state. The worksheet walks through both parents' net monthly incomes, the basic obligation from the schedule, and the proration between parents. The number it produces is what the court presumes is correct. Any estimate you see here is just a planning tool to help you gather figures. For your filing, complete the official worksheet, and consider having the Iowa Child Support Recovery Unit or an attorney review it before you rely on it in court.

How do overnights and shared care change support in Iowa?

Iowa builds parenting time into the calculation through a shared-care approach in the Income Shares guidelines. The key threshold is the extraordinary visitation credit, which applies when the paying parent has more than 127 overnights with the child per year. When overnights cross that line, the paying parent can receive a credit that reduces the obligation. Below 127 overnights, parenting time generally does not change the number. The size of the credit is fixed by the guideline schedule and worksheet, so the on-page estimate here may not reflect it precisely. Confirm your overnight count and the resulting credit on the official worksheet.

What counts as income for Iowa child support, including self-employment and bonuses?

Iowa uses net monthly income, which starts with gross income from all sources. That includes wages, overtime, bonuses, commissions, and self-employment earnings, not just base salary. From the gross figure, the guidelines subtract federal and state taxes, FICA, mandatory retirement contributions, union dues, the cost of dependent health insurance, and any existing court-ordered support you already pay. For self-employed parents, income is typically business receipts minus legitimate, ordinary business expenses. Because irregular pay like bonuses and self-employment profit can be hard to pin down, the court may average it over time. Keep tax returns and pay records, since the estimate here cannot capture every adjustment.

What happens to child support arrears I already owe in Iowa?

Past-due child support, called arrears, does not disappear when you adjust an order or when the child grows up. The Iowa Child Support Recovery Unit collects arrears through tools like immediate income withholding, intercepting tax refunds and even gambling winnings, suspending licenses, filing liens, and referring cases for contempt. A modification of your ongoing support amount changes future payments but does not erase what is already owed. If you have fallen behind, contact CSRU early to discuss your situation, because arrears keep accruing and interest can apply until the balance is paid in full.

When does child support end in Iowa?

Under Iowa law, child support typically ends when the child turns 18, but it continues through high school if the child is still a full-time student, not past age 19, whichever comes later. So a child who is still finishing high school at 18 may keep receiving support until graduation or age 19. Iowa also allows a separate post-secondary education subsidy, which a court can order to help with college costs for a child attending full time. Support does not stop automatically in every case, so check your order and the guidelines, since the end date depends on your child's specific situation.

How do I modify an Iowa child support order if my circumstances change?

You can ask to change an Iowa order by filing a petition in district court or by requesting a review through the Iowa Child Support Recovery Unit. The common administrative standard is a 50 percent variance, meaning the existing order differs from a new guideline calculation by at least that much. In court, you can also show a substantial change in circumstances, such as a major change in income, job loss, or a shift in the parenting schedule. Modifications generally apply going forward, so act promptly. Use this estimator to see whether your numbers have moved enough to justify a review, then confirm on the official worksheet.