How to Modify Child Support in Wyoming: Filing Steps and Effective Date
To modify Wyoming child support, file a petition with a confidential financial affidavit and serve the other parent. The change reaches only support after service, so serve as soon as your circumstances change.
How do you modify child support in Wyoming?
- Run the guideline amount in the Wyoming child support calculator and test it in the modification calculator.
- File a petition in the district court that entered the order, on the court’s self-help forms (packets 5 to 8), with a confidential financial affidavit; no order can be entered or modified without it (Wyoming Judicial Branch).
- Serve the other parent. Only support after service can change (20-2-311(d)).
- Show your ground and the guideline calculation.
- Keep paying the existing order until the court changes it.
How long does the other Wyoming parent have to answer?
Twenty days if served in Wyoming, or 30 days if served outside Wyoming (self-help packet instructions, CSMR 02).
Can the other parent be served outside Wyoming?
Yes; the answer time is 30 days instead of 20, and the process may take longer if the other state’s agency must help (Wyoming Judicial Branch; CSMR 02).
What goes with a Wyoming petition?
A confidential financial affidavit on the court-approved form, pay stubs and employer statements, and income tax returns; the child support computation form and net income calculation help (Wyoming Judicial Branch). Overtime counts only if the court finds it likely to continue after looking at 24 months.
Is there a medical support rule?
Yes. Every order must address medical support: the court orders either or both parents to provide coverage if it is available at reasonable cost and accessible, and splits uninsured expenses (Wyoming Judicial Branch; 20-2-401).
Can the Wyoming state agency help?
Yes. The Wyoming Child Support Program offers services including reviewing and modifying orders, and the department can petition for review of orders it enforces (20-2-311(a)). It represents the state, not you.
What if Wyoming parents change custody?
Use the custody and support modification packets, and file with the court: support cannot be modified back to when custody changed (Wyoming Judicial Branch).
What if one of several children ages out?
Child support does not automatically reduce when one child graduates, turns 18 or is emancipated; you must petition to change the amount (WYC_MOD).
How much does a late filing cost? An example
If you serve 3, 6 or 9 months after your change, the relief you lose at a $300 monthly difference is:
| Delay before service | Relief lost |
|---|---|
| 3 months | $900 |
| 6 months | $1,800 |
| 9 months | $2,700 |
What happens to unpaid support while the case is pending?
It stays owed as judgments with a late payment penalty. See whether Wyoming arrears expire or can be forgiven and add up your balance.
Frequently asked questions
How do I modify child support in Wyoming?
File a petition in the district court with a confidential financial affidavit and serve the other parent.
How long does the other Wyoming parent have to answer a modification petition?
Twenty days in Wyoming, 30 days outside.
When does a Wyoming modification take effect?
From the date notice of the petition was served, unless the parties agree otherwise.
Does a Wyoming child support order drop when a child turns 18?
Not automatically; you must petition to change the amount.
Does a Wyoming modification stop income withholding?
Not until the court enters the new order.
Official sources
- Wyo. Stat. 20-2-311: adjustment of child support orders
- Wyoming Judicial Branch: child support common questions
- Wyoming self-help packet: child support modification instructions
- 42 U.S.C. 666(a)(9): no retroactive modification of support already due
- 45 CFR 302.56: federal guideline requirements
A local family law attorney can review your situation — many offer a free consultation.
This is general information, not legal advice. It is based on the cited Wyoming statutes, rules and court opinions, and every case turns on its own facts. Confirm how the law applies to your situation with a licensed Wyoming attorney.