How Iowa Calculates Child Support

By the FigureMyTax Editorial Team · How we calculate

Iowa adds the parents’ adjusted net monthly incomes, reads the basic support obligation from the schedule for the number of children, has the noncustodial parent pay his or her proportional share adjusted for health insurance, and applies a low-income adjustment at the bottom of the schedule.

Step 1: Adjusted net monthly income

Each parent’s gross monthly income, which is reasonably expected income from all sources, is reduced by federal and state income tax calculated with the guidelines method, Social Security and Medicare tax and the other deductions in rule 9.5(2), then by any cash medical support ordered in the case, to get adjusted net monthly income (Iowa Court Rules 9.5 and 9.14(1)). See net income and the child care add-on.

Step 2: The basic support obligation

Add the two adjusted net incomes and find the combined amount in the Schedule of Basic Support Obligations for the number of children (rule 9.26; the last column is five or more children). The 2026 schedule runs to $30,000 of combined income; above that the amount is for the court but not less than the $30,000 amount.

Step 3: Low-income adjustment

The shaded part of the schedule protects a low-income noncustodial parent. If that parent’s adjusted net income is $1,250 or less (Area A), only that parent’s income is used. In Area B, between $1,251 and $1,800 for one child, $2,200 for two, $2,550 for three or four, and $2,650 for five or more, the lower of the calculation using only that parent’s income and the calculation using combined income applies (rule 9.3(2)). The adjustment does not apply in equally shared care.

Step 4: Share and health insurance

The noncustodial parent’s basic obligation is his or her percentage of the combined income times the basic support obligation. The children’s portion of the health insurance premium is prorated between the parents: the other parent’s share is added to the noncustodial parent’s obligation when the custodial parent pays the premium, and deducted when the noncustodial parent pays it. The adjustment is not made in Area A (rule 9.14(5)).

A worked example

Two children live mostly with their mother (A), who has adjusted net income of $3,000 a month and pays $120 a month for their health insurance. The father (B) has $4,500 and 60 overnights a year.

The monthly support is $1,276. With 150 overnights the extraordinary visitation credit lowers it to $1,035. The Iowa child support calculator reproduces both.

What to gather

Pay stubs and tax returns for both parents, the children’s share of the health insurance premium, child care invoices and a calendar of the actual overnights. Iowa courts require a Child Support Guidelines Worksheet before a support hearing.

A note on the schedule

The published schedule goes from the $8,751 to $8,800 row to the $8,851 to $8,900 row without a row for $8,801 to $8,850, in both the Supreme Court’s order and the codified rules. The calculator interpolates that band between its neighbors.

Frequently asked questions

Official sources

• Iowa Court Rules chapter 9: Child Support Guidelines
• Iowa Supreme Court order adopting the 2026 schedule and worksheets
• IRS Instructions for Form 2441: child care expense limits

This is general information, not legal advice. It is based on the cited Iowa statutes, rules and court opinions, and every case turns on its own facts. Confirm how the law applies to your situation with a licensed Iowa attorney.