How is Child Support Calculated in Ohio?

Ohio calculates child support using both parents' gross incomes — not net income after taxes. The state follows the Income Shares Model under ORC Chapter 3119: both parents' gross incomes are combined, that total is looked up on Ohio's Basic Child Support Schedule, and each parent pays their proportional share. The paying parent receives an automatic 10% reduction if they have at least 90 court-ordered overnights per year. Ohio's schedule covers combined annual incomes from $8,400 up to $336,000.

Ohio uses gross income — here's why that matters

Most states that use the Income Shares Model start with each parent's net income after taxes. Ohio starts with gross income. This is one of Ohio's most important and most misunderstood features.

Using gross income means the schedule produces higher baseline numbers than a net income system would for the same earning levels. The trade-off is simplicity and consistency — gross income is harder to manipulate than net income, which can shift significantly based on filing status, deductions, and other tax strategies. Ohio's approach reduces arguments about whose tax picture is more accurate.

If a parent is voluntarily unemployed or working below their earning capacity, Ohio courts may impute income — assigning earnings based on what that parent could reasonably make given their education, work history, and the local job market. Reducing hours or leaving a higher-paying job generally doesn't automatically reduce a child support obligation.

Adjustments before combining incomes

Ohio allows a narrow set of adjustments to each parent's gross income before the two figures are combined. These are not deductions in the tax sense — they're statutory adjustments defined under ORC § 3119.05 that reflect actual financial obligations.

Allowed adjustment	How it works
Local income taxes actually paid	City or municipal taxes paid are subtracted from gross income
Court-ordered spousal support paid	Support being paid to a former spouse under a court order is deducted
Other minor children living in the home	An adjustment — roughly 90% of the scheduled support amount for those children — is applied for biological or adopted children living with the parent who are not part of the current case

Federal and state income taxes are not deducted. Health insurance premiums, retirement contributions, and other personal expenses are not deducted. Ohio's list of adjustments is deliberately short, which keeps the formula straightforward and harder to dispute.

How the Basic Child Support Schedule works

Once both parents' adjusted gross incomes are combined, that combined annual figure is looked up on Ohio's Basic Child Support Schedule under ORC §3119.021. The schedule shows a monthly support obligation for each income level and number of children — one through six or more.

The schedule covers combined annual incomes from $8,400 up to $336,000. For incomes below $8,400 combined, minimum order provisions apply. For incomes above $336,000, courts use their discretion based on the child's needs and the family's established standard of living — the schedule doesn't cap at the top.

Each parent then pays their proportional share of the scheduled amount based on their percentage of the combined income. The non-custodial parent's share goes to the custodial parent.

Worked Example — Two incomes, one child

The 90-overnight parenting time reduction

This is Ohio's built-in acknowledgment that a parent who spends significant time with their child is also spending money directly on that child — food, clothing, activities, transportation — during that time.

When the paying parent has at least 90 court-ordered overnights per year, Ohio automatically reduces the guideline child support amount by 10%. The threshold is 90 nights — not 89. The reduction is written into the statute and applies automatically once that threshold is met.

Courts can also consider parenting time as a deviation factor for arrangements that go well beyond 90 nights. A parent with 150 or 180 overnights may argue that the standard 10% reduction doesn't adequately reflect the actual costs they're bearing — and courts have discretion to grant a larger adjustment based on the specific circumstances.

Minimum child support orders in Ohio

Ohio establishes floor amounts to ensure a support obligation exists on the record even when a parent has very limited income.

Situation	Minimum monthly order
Standard minimum (combined income below schedule floor)	$80 per month
Paying parent receives Medicaid, TANF, or similar means-tested benefits	$50 per month

Even at minimum amounts, the order is a legal obligation. If the paying parent's financial situation improves, the order can be reviewed and increased through the appropriate modification process.

Add-ons: health insurance and childcare

The amount from the Basic Child Support Schedule is the base obligation — not the total. Ohio adds two categories of costs on top of the baseline and splits them between the parents proportionally.

Health insurance costs for the children are added to the support calculation. If one parent provides coverage, the children's share of the premium is factored in and shared proportionally. Work-related childcare costs — daycare or after-school care that allows a parent to work — are handled the same way. Extraordinary medical expenses that arise and aren't covered by insurance are also typically split proportionally when they occur.

When a court may deviate from the guidelines

Ohio courts treat the guideline amount as the presumptive correct number. A deviation — upward or downward — requires documented justification. Courts consider a range of factors when deciding whether circumstances warrant a different amount.

Factors courts may weigh include the child's special needs, extraordinary educational or medical expenses, a significant disparity in the living standards between the two households, extended parenting time well beyond the 90-overnight threshold, other children either parent is legally obligated to support, and any significant financial resources the child independently has. The burden is generally on the parent requesting the deviation to show why the guideline amount doesn't serve the child's best interest.

If you're navigating divorce finances in Ohio more broadly, our Ohio divorce finances overview covers property division, spousal support, and retirement accounts in one place. We also have a separate guide on how spousal support is calculated in Ohio — including the 14 statutory factors courts weigh since Ohio has no alimony formula.

Common questions about Ohio child support

Does Ohio child support end at 18? Generally yes. Ohio child support ends when the child turns 18. If the child is still enrolled in high school at 18, support typically continues through graduation — but no later than age 19. Courts may order support beyond 18 for a child with a physical or mental disability that prevents self-support, depending on the documented need.

Can Ohio child support be modified? Yes. Either parent may request a modification through the Child Support Enforcement Agency (CSEA) or directly through the court. Ohio uses a 10% threshold — if the recalculated amount would differ from the current order by 10% or more, that typically qualifies as a substantial change in circumstances sufficient to support a modification. Either parent can request an administrative review every 36 months without needing to show a change in circumstances.

What if a parent is self-employed? Self-employment income is included in gross income. Courts examine business revenue minus ordinary and necessary business expenses to determine the income available for support. Expenses that appear personal in nature or disproportionately high may be scrutinized. Ohio courts have authority to review financial records and tax returns when self-employment income is in dispute.

What is Ohio's CSEA? The Child Support Enforcement Agency is Ohio's state agency that administers child support — processing payments, reviewing orders, and pursuing enforcement when payments fall behind. Each county has its own CSEA office. If you have an existing Ohio support order, your payments typically flow through the CSEA rather than directly between parents.