Understanding your situation
You have an existing child support order — entered by judgment, stipulation, or administrative order — and your circumstances have changed materially. Maybe you lost your job. Maybe your income dropped substantially. Maybe you had another child whose needs must now factor into your guideline calculation. Maybe custody shifted and the child now lives primarily with you.
Federal law generally requires states to maintain periodic review procedures (typically every three years) and to allow earlier review on a showing of substantial change. The 'substantial change' threshold varies by state — some apply a specific percentage or dollar threshold, others use a discretionary standard. Consult your state's modification statute for the applicable rule.
Unlike an appeal, a modification is based on current circumstances — not on errors in the original order. The motion must typically be filed in the court that issued the original order, unless jurisdiction has been properly transferred under UIFSA.
Crucially: federal law generally limits retroactive modification of past-due amounts, so any reduction usually applies only prospectively. Stopping payments unilaterally while preparing the motion creates enforcement risk — continue complying with the current order unless and until a new order is entered.
If the income reduction was voluntary (you quit, were fired for cause, left for a lower-paying job), the court will scrutinize whether the change was in good faith. Voluntary underemployment can result in income imputation based on your prior earning capacity.
What you need to prepare
- ✓Copy of the current child support order being modified (with case number)
- ✓Documentation of the change in circumstances (termination letter, medical records for disability, birth certificate for new dependent, custody order for residence change)
- ✓Current pay stubs (last 3 months) or self-employment income records
- ✓Most recent federal tax return
- ✓Bank statements (last 3 months)
- ✓Evidence of good-faith job search if the income loss is recent (job-search log, rejection letters, unemployment benefits documentation)
- ✓New custody / overnight calendar if custody has changed
- ✓State guideline worksheet completed with new income figures
⏰ Deadline
File the motion as soon as the substantial change occurs. New calculations typically apply from the filing date forward — arrears on the original amount continue to accrue until the modification is granted.
🏛️ Authority
The court that issued the original order (or a court that has received jurisdiction under UIFSA). Typically the state family court or superior court family division.
⚖️ Legal basis
State modification statute for the applicable jurisdiction. Federal framework: federal law restricts retroactive modification of arrears and requires states to maintain periodic review procedures. The DocuGov generator inserts the state-appropriate citation into the final motion draft based on your selected jurisdiction.
Expert tips
- 1File the day the substantial change occurs — every day of delay is typically unchangeable past-due support.
- 2Continue paying the existing amount until the new order is entered. Stopping creates contempt risk and undermines credibility.
- 3Attach a complete Financial Affidavit with exhibits. Courts rarely modify based on bare allegations.
- 4If the job loss was voluntary, address this directly — courts can impute income based on prior earning capacity if they find the reduction was voluntary.
- 5For disability-based modification, attach medical records and Social Security determination letters if applicable.
- 6If custody changed, attach the new custody order or a signed overnight calendar — not just your testimony.
- 7Request a specific new guideline amount in your motion, using your state's worksheet.
- 8Serve the other parent AND the state IV-D agency if the case is handled by a state enforcement agency.