Do I need to file a worksheet even if we agree on the amount?

Yes. Courts require both parties to file a complete Child Support Obligation Worksheet with every child support order, even when the parents agree on the amount. The Indiana Judicial Branch provides a free online calculator that generates a court-ready worksheet.

What adjustments does the calculation include?

Health care costs, childcare expenses, and parenting time credits are all factored in on top of the basic obligation from the income shares calculation.

How is child support enforced in Indiana?

Through income withholding orders sent to the employer, forwarding deducted support to the Indiana State Central Collection Unit (INSCCU). If a parent is at least four weeks behind, withholding is triggered automatically. Beyond withholding, the Indiana Child Support Bureau can pursue wage garnishment, tax refund interception, driver's license suspension, property liens, and contempt filings.

Indiana, United States

Indiana Child Support: A Parent's Guide

Q: How is child support calculated in Indiana?

Using the Indiana Child Support Guidelines, an income shares model: both parents' adjusted gross incomes are combined, each parent's proportional share is determined, and that share is applied to a basic support obligation based on the number of children.

Q: How do I request a modification in Indiana?

By petitioning the court to modify the order when there's a substantial and continuing change of circumstances, or when the previous order is at least 12 months old and the guideline-calculated amount differs from the current order by at least 20%. Only a court can approve the modification, parents can't simply agree to change support on their own.

How child support works in Indiana, in plain English: the income shares guidelines, modification, and DCS enforcement.

Legal sources reviewed: August 10, 2026

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In short: Indiana uses the income shares model, and every order, even an agreed one, requires a filed Child Support Obligation Worksheet. Modification requires either a substantial change or a 20% difference on a 12-month-old order, and enforcement runs through the Department of Child Services (DCS) and income withholding sent to the Indiana State Central Collection Unit.

This is an educational overview written for parents, not lawyers. It isn't legal advice. For anything beyond general understanding, talk to a licensed Indiana family law attorney.

What Indiana generally provides

Indiana calculates child support under the Indiana Child Support Guidelines, an income shares model reflecting the support a child would have received if the parents lived together: both parents' adjusted gross incomes are combined, each parent's proportional share is determined, and that share is applied to the basic support obligation for the number of children.

Important terminology

Child Support Obligation Worksheet: the mandatory document every Indiana support order must include, regardless of whether the parents agree on the amount.
DCS: the Indiana Department of Child Services, which handles child support orders and enforcement.
INSCCU: the Indiana State Central Collection Unit, which receives withheld support from employers.

How the calculation works

Combining and apportioning adjusted gross income

Both parents' adjusted gross incomes are combined, and each parent's percentage share of the total obligation is calculated based on their share of that combined income, applied against the state's basic obligation figure for the number of children.

Add-ons and adjustments

The calculation factors in health care costs, childcare expenses, and parenting time credits, on top of the basic income-shares obligation, similar to the structure used in most income-shares states.

The worksheet requirement

Courts require both parties to file a complete Child Support Obligation Worksheet with every order, even when the parents agree on the support amount. Indiana's Judicial Branch provides a free online calculator that generates a court-ready version of this worksheet.

Requesting or defending a modification

A party can petition the court for a modification where there's a substantial and continuing change of circumstances, or where the existing order is at least 12 months old and the guideline-calculated amount would differ from the current order by at least 20%. Importantly, only the court can approve a modification, parents cannot simply agree between themselves to change the support amount and skip court approval. See the child support calculator and guideline finder for jurisdiction-specific calculation sources and guidance.

How enforcement works

Income Withholding Orders (IWOs) are the primary enforcement tool: once sent to an employer, the withheld support is forwarded to the Indiana State Central Collection Unit (INSCCU). If a paying parent who is employed falls at least four weeks behind in support, a withholding order goes to the employer automatically. A parent who is current can also request withholding voluntarily as a more convenient payment method. Beyond wage withholding, the Indiana Child Support Bureau can pursue tax refund interception, driver's license suspension, property liens, and contempt of court filings for continued nonpayment.

Common questions

Do we still need the worksheet if we've already agreed on an amount? Yes, Indiana requires the worksheet regardless of parental agreement, it's part of every order.

Can I just handshake-agree to a lower payment with my co-parent? No, only the court can approve a modification; an informal agreement between parents doesn't legally change the order or protect against enforcement based on the original amount.

What if my co-parent isn't paying? Contact the Indiana Child Support Bureau, part of DCS, which can pursue wage garnishment, tax refund interception, license suspension, and contempt.

Practical considerations

Because Indiana's 20% modification threshold only applies once an order is at least 12 months old, a recent order generally needs to rely on the substantial-change standard instead, worth confirming which path fits your timeline with a family law attorney or DCS. For the custody and parenting-time rules that shape the underlying calculation, see the Indiana custody guide.

Official Indiana resources

FAQ

Questions, answered

This information is provided for educational purposes only and is not legal advice. Family law varies by individual circumstances and may change over time. Consult a qualified attorney or appropriate official resource for advice about your situation.