Calculate child support using Ohio's income shares model with 90-overnight 10% reduction and $300,000 annual cap
Free calculator based on Ohio Revised Code Chapter 3119 (House Bill 366, effective March 28, 2019). Uses gross annual income — no tax deductions — with automatic 10% reduction for 90+ overnights per year.
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Ohio uses an Income Shares Model under Ohio Revised Code Chapter 3119 (House Bill 366, effective March 28, 2019). Both parents' gross annual incomes are combined and used to look up the Basic Child Support Obligation (BCSO) from the official JFS 07767 schedule. Each parent pays a share proportional to their income percentage. Health insurance, net childcare, and cash medical support are added to the BCSO before splitting. Ohio is unusual in that it uses gross income — no tax deductions — because the schedule already incorporates tax and living expense assumptions.
Ohio uses gross annual income — not net income. This is a major difference from states like Florida and New Jersey. Ohio's JFS 07767 guideline schedule already incorporates assumptions about taxes and basic living expenses, so no deductions for federal tax, state tax, or FICA are made before looking up the obligation. Health insurance and childcare are not deducted from income — they are added on top of the schedule amount. The only pre-calculation adjustments Ohio allows are for alimony paid and court-ordered child support for other children, treated as deviation factors rather than formula deductions.
Ohio law automatically reduces the obligor's annual support obligation by 10% when they have 90 or more court-ordered overnights per year (approximately 25% of the year). This reduction is applied to the annual obligation before converting to monthly. If the obligor has 147 or more overnights per year (approximately 40%), the court must specifically consider an additional deviation beyond 10%, and if denied, must provide written findings of fact explaining why. The 90-overnight reduction can be removed if you fail to actually exercise your parenting time without a valid reason.
Ohio child support terminates when a child turns 18 OR graduates from high school, whichever occurs later — with an absolute maximum age of 19, even if still in high school. Support can terminate earlier through emancipation (marriage, military enlistment, court order, or becoming financially self-supporting). For children with physical or mental disabilities that prevent self-sufficiency, support may extend indefinitely beyond age 19. Ohio courts can also order college contributions using their equitable powers, though this is discretionary and not automatic.
Yes. Ohio child support can be modified if a recalculation shows a change of ±10% or more from the current order amount — this constitutes a "substantial change in circumstances" under ORC 3119.79. Courts apply this threshold strictly. Orders are eligible for administrative review every 36 months. For changes before 36 months, you must demonstrate the threshold is met. Modification is effective from the date the petition is filed — not retroactive. You must continue paying under the existing order until a modification is approved.
Ohio's child support schedule covers combined annual gross income up to $300,000 per year (raised from a lower cap by House Bill 366 in 2019). Above $300,000, no fixed formula applies — courts use full discretion to set support based on the child's demonstrated lifestyle and reasonable needs. This is the most contested area in high-income Ohio child support cases, as courts often extrapolate significantly above the schedule maximum. The minimum monthly obligation is $80, though courts can order less in specific circumstances such as disability or incarceration.
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This calculator provides estimates based on Ohio state guidelines. Actual court orders may differ based on individual circumstances. Consult with a qualified family law attorney for advice specific to your situation.