Indiana Child Support Calculator: How Support is Calculated in 2026

Indiana calculates child support using the Income Shares Model, an approach designed to ensure a child receives roughly the same proportion of parental income that the child would have received if the parents lived together. Support amounts are determined by the Indiana Child Support Guidelines, which are adopted and periodically revised by the Indiana Supreme Court and applied in every county. This guide explains how the calculation works in 2026, the figures that drive it, and how the official worksheet fits together.

The Income Shares Model

Under the Income Shares Model, the weekly gross income of both parents is combined to determine a basic child support obligation drawn from the Guideline Schedules. That combined obligation is then divided between the parents in proportion to their respective shares of the combined income. The parent who does not have primary physical custody generally pays his or her share to the other parent, adjusted for parenting time and certain expenses.

The statutory foundation for a child support order appears in Indiana Code Section 31-16-6-1, which directs courts to consider the financial resources of the custodial and noncustodial parent, the standard of living the child would have enjoyed, the physical and mental condition of the child, and the child's educational needs. The Guidelines translate those factors into a structured calculation.

Determining Weekly Gross Income

The calculation begins with each parent's weekly gross income. Under the Guidelines, "gross income" is defined broadly and includes wages, salaries, commissions, bonuses, self-employment income, rental income, interest, pensions, and most other sources of income. It does not generally include means-tested public assistance.

Adjustments to Income

Several adjustments may reduce a parent's weekly gross income before the shares are calculated, including:

• A credit for the cost of supporting prior-born children, whether by court order or by Guideline calculation
• Court-ordered maintenance actually paid to a former spouse
• The cost of supporting subsequent-born children, in the limited circumstances the Guidelines allow

Accurate income figures are the single most important input. A small error in weekly gross income can change the support amount for years.

Work-Related Childcare and Health Insurance

Two categories of expense are added to the basic obligation and then shared in proportion to income:

• Work-related childcare — the reasonable cost of childcare a parent incurs because of employment or a job search
• The child's portion of health insurance premiums — the incremental cost of covering the child under a parent's plan

The parent who actually pays these costs receives credit for the other parent's proportional share.

The Parenting Time Credit

Indiana recognizes that a parent who exercises substantial parenting time directly bears some of the child's costs during that time. Guideline 6 provides a parenting time credit based on the number of annual overnights the paying parent exercises. As overnights increase, the credit increases, reducing the net support obligation. This is why an accurate parenting time schedule — typically set out in a parenting plan — is essential to a correct support figure.

Using the Official Worksheet

The calculation is documented on the Indiana Child Support Obligation Worksheet (CSOW), a standardized form that walks through each line: weekly gross income for each parent, adjustments, combined income, the basic obligation from the schedules, additions for childcare and health insurance, the proportional shares, and the parenting time credit. The completed worksheet is filed with the court and becomes part of the support order. QuillReady offers an Indiana Child Support Worksheet with line-by-line fields and a parenting-time credit table to help organize these figures before filing.

Post-Secondary Education and Other Issues

Indiana support can extend beyond the basic obligation. Indiana Code Section 31-16-6-2 authorizes courts to order parents to contribute to a child's post-secondary education expenses, considering each parent's ability to pay and the child's aptitude. Educational support orders are separate from, and calculated differently than, the basic weekly obligation.

Modifying a Support Order

A child support order is not permanent. Under Indiana Code Section 31-16-8-1, a support order may be modified upon a showing of a substantial and continuing change in circumstances that makes the existing terms unreasonable, or upon a showing that the ordered amount differs by more than twenty percent (20%) from the amount that would be ordered under the Guidelines and the order is at least twelve (12) months old. If circumstances such as job loss, a significant income change, or a change in parenting time have occurred, a recalculation may be warranted. See QuillReady's Indiana Petition for Modification of Custody or Support.

Where Support Fits in a Dissolution

In a dissolution involving minor children, the child support worksheet is filed alongside the parenting plan and the dissolution paperwork. For the full set, see the Indiana Agreed Entry of Dissolution (With Children) and the Indiana Parenting Plan Template, both of which integrate with the child support calculation.

This article is for informational purposes only and does not constitute legal advice. Consult a licensed attorney before taking any legal action.