Iowa Child Support Calculator

Iowa calculates child support using the income shares model under Iowa Court Rules Chapter 9 and Iowa Code § 598.21B. Both parents' adjusted net incomes are combined, then matched to the Schedule of Basic Support Obligations based on the Betson-Rothbarth (BR5) study. Each parent's share is proportional to their percentage of combined net income. For example, a parent earning 60% of the combined income pays approximately 60% of the scheduled support amount.

Iowa child support calculations use each parent's adjusted net income, starting with gross income from all sources including wages, self-employment, commissions, and bonuses. Deductions include federal and state taxes, Social Security, Medicare, mandatory pension contributions, union dues, and prior support obligations actually paid. The court may impute income equal to 40 hours per week at Iowa's minimum wage if a parent is voluntarily underemployed or fails to provide income verification.

Custody arrangements significantly affect Iowa child support calculations. Noncustodial parents with court-ordered parenting time exceeding 127 overnights per year receive an extraordinary visitation credit under Iowa Court Rules Chapter 9. In split or divided physical care, Iowa courts calculate each parent's obligation based on the children in the other parent's care, then offset the two amounts so the higher-obligated parent pays only the net difference.

Iowa child support can be modified when there is a substantial change in circumstances under Iowa Code § 598.21C. Qualifying changes include shifts in employment or earning capacity, receipt of an inheritance or pension, changes in medical expenses, changes in the number of dependents, or a parent's remarriage. Iowa also requires periodic review of guidelines every four years to ensure accuracy. Either parent may file a modification petition with the court.

Iowa child support covers basic needs through the Schedule of Basic Support Obligations, plus additional categories. As of 2025, child care expenses are handled exclusively through a new add-on under Rule 9.11A rather than as a deduction from the custodial parent's income. Medical support requires the custodial parent to cover the first $250 per child per year (up to $800 total for all children), with remaining uncovered medical expenses split proportionally between parents based on their respective net incomes.

Iowa's child support schedule uses three income zones rather than a fixed cap. Area A covers low-income obligors with net incomes of $0–$1,150 per month, using only the obligor's income for a reduced minimum order. Area B applies a transition formula using the lesser of two calculations. Area C uses the standard combined-income formula. The court may deviate from guidelines with a written finding that the standard amount would cause substantial injustice under Rule 9.11.

Iowa child support generally continues until the child turns 18 under Iowa Code § 598.1(8). Support extends to age 19 if the child is enrolled full-time in high school or GED equivalency and is reasonably expected to graduate before turning 19. Children with physical or mental disabilities may receive support indefinitely. Iowa courts may also order a postsecondary education subsidy for college expenses through age 22, which is separate from the child support obligation.

Iowa enforces child support through multiple mechanisms under Iowa Code Chapter 252D. Consequences include automatic wage withholding, bank account garnishment, property liens, federal and state tax refund interception, and credit bureau reporting. Parents more than 3 months behind face driver's license suspension plus suspension of professional, hunting, fishing, and boating licenses. Arrears exceeding $2,500 trigger federal passport denial. Courts may hold violators in civil contempt with conditional jail terms until payments resume.