Child Support in Union County
Reviewed by Stephanie Green · Managing Partner & Co-Founder · Last updated June 11, 2026
Union County, Ohio · Marysville
Child support in Union County follows Ohio's statewide 2024 Income Shares Model, which calculates support from each parent's income, the number of children, and health-insurance and childcare costs. The court that has your case sets the order — the Domestic Relations Division for married parents, the Juvenile Court for never-married parents — and the Union County Child Support Enforcement Agency (CSEA) collects payments by wage withholding.
How is child support set and changed in Union County, Ohio?
Run both parents' incomes through the official Ohio Child Support Guideline Calculator, print and sign the worksheet, and file it with your case — at the Union County Domestic Relations Division (married parents) or the Juvenile Court (never-married parents). File a Title IV-D Application so the Union County CSEA can open a case and collect by wage withholding. To change an existing order, file a motion to modify (a post-decree motion in a DR case has a $485 deposit) or ask CSEA at (937) 644-1010 to review it. The court can establish, modify, or enforce support.
Ohio Child Support by the Numbers
- 2024 Year Ohio's updated Income Shares support schedule took effect Source: Ohio Revised Code § 3119.021
- 10% Change in the calculated amount that justifies a modification Source: Ohio Revised Code § 3119.79
- 3 years How often either parent can request an administrative review Source: Ohio Revised Code § 3119.60
- Age 18 When support normally ends — or high-school graduation, whichever is later Source: Ohio Revised Code § 3119.86
What Counts in an Ohio Child Support Calculation
| What the worksheet counts | Counts toward support? | Notes |
|---|---|---|
| Both parents' gross income | Yes | Wages, salary, commissions, bonuses, and self-employment earnings |
| Health insurance for the children | Yes | Credited to the parent who pays the premium |
| Work-related childcare | Yes | Daycare and after-school costs are added in |
| Parenting time | Yes | Adjustments apply for substantial or equal parenting time |
| Imputed income | Sometimes | Added when a parent is voluntarily unemployed or underemployed |
| A new spouse's income | No | Only the two parents' incomes are counted |
Where to File: Union County Court of Common Pleas - Domestic Relations Division
215 W 5th St, Marysville, OH 43040, Marysville, OH 43040Phone: (937) 645-3015
Hours: Monday–Friday (call the Clerk to confirm current hours)
Website: www.unioncountyohio.gov/departments/CommonPleasCourt
Child Support is the right path if…
- You need to establish a first child-support order or change an existing one.
- Your income, the other parent's income, parenting time, or childcare/health-insurance costs have changed.
- You want CSEA to collect support automatically by wage withholding.
- You need to enforce a support order the other parent isn't paying.
Filing Fees
Support is calculated on the Ohio 2024 Income Shares worksheet · establishing support is part of your case deposit · post-decree modification $485 in a DR case · CSEA reviews and enforces orders at (937) 644-1010
Forms & Filing Packets
Establish a new child-support order — Part of the divorce/dissolution deposit, or the Juvenile case deposit
File the official worksheet and a IV-D application with your case so CSEA can calculate and collect support.
- Ohio Child Support Computation Worksheet (2024 Income Shares) — Run the official Ohio Child Support Calculator, print, and sign. Required any time the court sets or changes support.
- Health Insurance Affidavit (Ohio SC Affidavit 4) — Discloses whether health insurance is available for the children through either parent's employer, so the court can order medical support.
- Title IV-D Child Support Services Application — Opens a IV-D child-support case with the Union County Child Support Enforcement Agency so it can calculate, collect, and enforce support by wage withholding. Available from the Juvenile Clerk or CSEA at (937) 644-1010; confirm the current form before filing.
Modify an existing support order — $485 post-decree motion (DR) · or CSEA administrative review
File a motion to modify in the case that issued the order, with an updated worksheet, or ask CSEA to review it.
- Motion for Change of Child Support (Ohio SC Form 28) — The Ohio uniform motion to change child support, medical support, or the tax exemption after a change of circumstances. File in the division that issued the order.
- Ohio Child Support Computation Worksheet (2024 Income Shares) — Run the official Ohio Child Support Calculator, print, and sign. Required any time the court sets or changes support.
- Post-Decree Motion to Modify (custody, parenting time, or support) — Reopens your original Domestic Relations case to change custody, parenting time, or support after the decree. The deposit is $485. Draft the motion in the existing case, state what changed, and attach a supporting affidavit; confirm packet requirements with the Clerk at (937) 645-3015.
How to File Child Support in Union County
- Run the official calculator. Use the Ohio Child Support Guideline Calculator with both parents' incomes, health-insurance, and childcare costs; print and sign the worksheet.
- Pick the right court. Married or divorcing parents set support in the Domestic Relations Division; never-married parents set it in the Juvenile Court.
- File the worksheet and IV-D application. File the worksheet with your case and a Title IV-D Application so CSEA can open the case and collect by wage withholding.
- To change an order, file a motion. File a motion to modify in the case that issued the order (a DR post-decree motion has a $485 deposit) or ask CSEA at (937) 644-1010 to review it.
- Enforce if needed. If the other parent isn't paying, CSEA can enforce, or you can file a motion to show cause for contempt.
Union County Practice Notes
- Ohio 2024 Income Shares Model. Ohio sets a presumed support amount from both parents' incomes, the number of children, and health-insurance and childcare costs, using the statewide guideline worksheet. The court can deviate from the guideline figure when the child's best interest justifies it.
- CSEA collects and enforces. Filing a IV-D application opens a case with the Union County Child Support Enforcement Agency, which collects support by automatic wage withholding and can enforce through license suspension, tax intercept, credit reporting, and contempt referrals. Reach CSEA at (937) 644-1010.
- Modifications need a real change. To change support you generally must show a substantial change of circumstances or meet the guideline-deviation threshold. File a post-decree motion ($485 in a DR case) or request a CSEA administrative review; support changes can also start through the agency.
Frequently Asked Questions
- What is a IV-D application and why do I need one?
- A IV-D Application opens a child-support case with your county's Child Support Enforcement Agency (CSEA). Once opened, CSEA collects support through automatic wage withholding, distributes it to the receiving parent, and can enforce the order through license suspension, federal tax intercept, credit reporting, and contempt referrals. Filing a IV-D Application is standard whenever a child-support order is issued.
- How much does it cost to change a Union County order after the decree?
- A post-decree motion to modify custody, parenting time, or support has a $485 deposit and is filed in your original Domestic Relations case. A counterclaim in a divorce is $100, and a guardian ad litem deposit is $500. Support changes can also start through the Child Support Enforcement Agency at (937) 644-1010. Some post-decree motions may require the co-parenting class again.
- What does it cost to file for custody in the Union County Juvenile Court?
- An agreed custody case costs $75 to file in the Union County Juvenile Court (Room 107, (937) 645-3029 ext. 3411); a contested one costs $115. A show-cause motion to enforce an order has a $100 deposit. Registering an out-of-state custody order is $115, or $175 if you also ask to enforce or modify it at the same time.
- How do I enforce a Union County custody or support order?
- File a motion to show cause (for contempt) in the case that issued the order. In the Juvenile Court a show-cause motion has a $100 deposit; in a Domestic Relations case it is filed as a post-decree motion with the $485 deposit. The motion must state the specific order being violated. Support enforcement can also go through the Child Support Enforcement Agency at (937) 644-1010.
Free Local Resources in Union County
- Union County Clerk of Courts. Provides current filing fees, local forms, and filing instructions for custody, divorce, and dissolution cases. Call (937) 645-3015 or visit https://www.unioncountyohio.gov/departments/CommonPleasCourt before filing to confirm deposits and packet requirements.
- Union County Child Support Enforcement Agency (CSEA). Union County's IV-D agency opens child-support cases, runs wage withholding, distributes payments, and enforces orders. File a IV-D Application when establishing or modifying support.
Other Family-Law Topics in Union County
- Statewide Custody Overview — How Ohio custody and parenting time work at a high level.
- Talk to a Family Law Attorney — Connect with a Union County custody attorney for help with your case.
Related to your child support case
- Paternity & Custody — Establish parentage and build a parenting plan that protects your children.
- Post-Decree Modification — Update custody, support, or parenting orders after your case ends.
- Spousal Support — Pursue or respond to alimony requests during and after divorce.
Related guides
In-depth, attorney-written guides on child support and related Ohio family law topics.
- Child Support Calculation in Ohio: How the Formula Works — Ohio calculates child support with the income shares model, combining both parents' incomes to set a shared obligation. Here's how the formula works and what changes the bottom line.
- How to Modify Child Support in Ohio — Child support orders aren't permanent. When income or circumstances change substantially, Ohio lets you modify support — through a CSEA review or a court motion. Here's how.
Keep exploring
- Ohio Child Support guide — Statewide overview of child support in Ohio.
- Columbus family law — Local attorneys and courts serving the Columbus metro.
- Meet Stephanie Green — Managing Partner & Family Law Attorney at Gavvl Law.
- Payment plans & financing — Flat fees with Gavvl Direct, Affirm, Klarna, or PayPal Pay Later.
Call (844) 694-2885 or email support@gavvl.com.
