How is Child Support Calculated in Indiana?

Indiana calculates child support using the Income Shares Model — both parents' weekly gross incomes are combined, and the Indiana Child Support Guidelines schedule determines the basic obligation. Each parent contributes proportionally to that obligation based on their share of combined income. Parenting time then factors in through a credit system that reduces the paying parent's obligation based on how many overnights they have per year. One thing that stands out about Indiana: child support may continue until a child turns 19 — not 18 like most states.

Indiana uses weekly gross income — not net

This is one of the first things that surprises people unfamiliar with Indiana's guidelines. Most states that use the Income Shares Model work from each parent's monthly gross income. Indiana uses weekly gross income as the starting point. The child support schedule and the entire formula are built around weekly figures.

Gross income in Indiana is broadly defined. It includes wages, salaries, commissions, bonuses, overtime, self-employment income, rental income, dividends, Social Security benefits, disability payments, workers' compensation, unemployment compensation, and any other regular financial resource. One-time windfalls — like a lottery win — are not typically treated as income for ongoing support calculations, but courts have discretion to consider them.

If a parent is voluntarily unemployed or working below their earning capacity, Indiana courts may impute income — meaning the court assigns an income figure based on what that parent could reasonably earn given their education, work history, and the local job market. Imputation is common when a parent reduces their hours or leaves a job without good cause around the time of a support proceeding.

Once each parent's adjusted weekly gross income is determined, the two are added together to get the combined weekly adjusted income. That combined figure is what drives the schedule lookup.

The Income Shares schedule

The Indiana Child Support Guidelines include a schedule that maps combined weekly adjusted income and number of children to a basic child support obligation. The schedule is a table — you find the row that matches the combined income and the column for the number of children, and the intersection gives you the basic obligation amount.

That basic obligation represents what both parents together are expected to spend on the child. It is then split between the parents in proportion to their individual shares of combined income.

The parenting time credit

Once the basic obligation is set, Indiana applies a parenting time credit (PTC) that reduces what the paying parent owes. The logic is straightforward: when a parent has the child in their home, they are directly paying for food, shelter, clothing, and everyday expenses. The credit acknowledges those direct contributions so the parent isn't essentially paying twice.

The credit is calculated based on the number of overnights per year the paying parent has with the child. Indiana uses a specific formula rather than a simple table of percentages. The credit grows incrementally as overnight count increases.

Overnights per year	Effect on obligation
Fewer than 52	No parenting time credit applied
52–91	Small credit begins; grows with each additional overnight
92–127	Moderate credit; meaningful reduction in weekly obligation
128–181	Larger credit; obligation may be substantially reduced
182 or more (roughly 50/50)	Modified income shares calculation — each parent may owe the other depending on income difference

At 182 or more overnights — roughly equal parenting time — Indiana switches to a modified calculation. When both parents are sharing custody substantially equally, both are directly bearing significant daily expenses. The formula shifts to compare what each parent would owe the other under the income shares model and in some cases may result in a net transfer from the higher-earning parent to the lower-earning parent even with equal time.

Add-ons: health insurance and childcare

The basic obligation from the schedule and the parenting time credit are just the foundation. Indiana's guidelines also account for additional expenses shared between parents.

Health insurance premiums: The cost of the children's health insurance is factored into the Indiana calculation. If one parent provides coverage for the children through their employer, the premium cost attributable to the children (not the entire family plan) is included in the formula and allocated between parents proportionally. This adjustment can raise or lower the net obligation depending on which parent pays the premium.

Work-related childcare: Childcare costs that allow a parent to work or actively seek work are added to the support calculation and shared proportionally between parents. Indiana's guidelines cap childcare expenses at the market rate for comparable care — courts generally don't include above-market arrangements in the calculation.

Extraordinary medical expenses: Uninsured medical costs above a certain threshold may be shared between parents. Routine medical costs are considered covered by the basic support obligation. Significant expenses — surgeries, orthodontia, specialist treatment — are often allocated proportionally based on income shares.

If you're looking at the broader picture of divorce finances in Indiana — including property division and the state's 50/50 presumption — our Indiana divorce finances overview covers how courts approach assets and debts. We also have a full guide on how alimony works in Indiana, including its strict limits on maintenance awards.

Deviating from the guidelines

Indiana courts treat the guideline amount as the presumptively correct figure. A deviation is possible, but the court must state in writing why the guideline amount is unjust or inappropriate and what the guideline amount would have been.

Common grounds courts may consider for deviation include a child's special needs that go beyond the ordinary schedule obligations, situations where one parent's income is extraordinarily high and the schedule amount would far exceed the child's actual needs, cases where a parent is providing significant in-kind support beyond the basic obligation, and educational expenses the parties have agreed to share. Courts have broad discretion — two similar cases can produce different outcomes depending on how a judge weighs the specific facts.

When Indiana child support ends

Indiana's end date for child support is 19 — not 18. This is one of the more meaningful differences between Indiana and most other states, where support ends at 18 or 18 and a high school graduation, whichever comes later.

In Indiana, the age of emancipation for child support purposes is 19 under I.C. 31-16-6-6. That means an 18-year-old who has graduated high school but is not yet 19 is still entitled to support in Indiana. The one-year extension matters for budgeting and planning — parents should not assume support ends the summer their child turns 18.

Support may end earlier in some circumstances. If a child marries, joins the military, or is otherwise legally emancipated before age 19, the obligation typically ends. Courts also have discretion to extend support beyond 19 for a child with a physical or mental disability that prevents self-support — but this extension requires a court order and specific findings.

Modification and enforcement

Either parent may seek a modification of a child support order when circumstances have changed substantially. Indiana courts generally look for a change that would produce a difference of at least 20% in the support amount — or, in some cases, $40 per week — when the guidelines are applied to current incomes. A voluntary reduction in income does not automatically justify a modification; courts examine whether the change was made in good faith.

Indiana's child support enforcement system is administered through the Indiana Child Support Bureau. Enforcement tools include income withholding orders (the most common mechanism — support is deducted directly from wages), tax refund interception, license suspension, and contempt of court proceedings. If you are receiving support and payments have stopped or become irregular, contacting the Child Support Bureau is typically the first step before returning to court.

Common questions about Indiana child support

Does Indiana use gross or net income? Indiana uses weekly gross income — before taxes and deductions. Certain specific deductions (existing child support orders, court-ordered maintenance, children's health insurance premiums being paid) reduce gross income to an adjusted figure, but the starting point is always gross, not take-home pay.

What if parents have joint custody? Joint legal custody doesn't by itself change the child support calculation. What matters for the support formula is parenting time — specifically how many overnights each parent has per year. Legal decision-making authority is a separate question from physical time with the child, which drives the parenting time credit.

What if a parent is self-employed? Self-employment income is included. Indiana courts look at gross business receipts minus ordinary and necessary business expenses. Courts may scrutinize claimed expenses carefully — expenses that reduce taxable income but don't reflect actual cash outlay may be added back. If significant business deductions are involved, getting a clear picture of adjusted gross income is worth working through carefully with an attorney.

Can parents agree to a different amount? Parents may stipulate to a different amount in a settlement agreement, but the court must approve it. When approving a deviation from the guidelines, the court is required to state what the guideline amount would have been and why the agreed amount is appropriate. An amount below the guideline amount requires more scrutiny than one above.

For a broader look at how child support formulas work across different states, our general guide on how child support is calculated walks through the income shares model, the percentage of income model, and what factors courts most commonly consider.