To file for more child support, you can either ask your state’s child support agency to review your order or file a modification motion with the court that issued it. Federal law requires every state to offer a review-and-adjustment process, and either parent can request that review at least once every three years without proving anything has changed.1Office of the Law Revision Counsel. 42 USC 666 – Requirement of Statutorily Prescribed Procedures to Improve Effectiveness of Child Support Enforcement If your order is less than three years old, you can still seek an increase, but you’ll need to show a real change in circumstances. Forms, fees, and timelines vary by state; the underlying process is the same everywhere.
Pick Your Path: Agency Review or Court Motion
If your case runs through your state’s child support enforcement agency (the IV-D agency), contact that office and ask for an administrative review. The agency gathers income information from both parents, runs the numbers through the state guidelines, and decides whether the current order should change. This route is typically free, and the agency handles most of the paperwork.2ACF. Changing a Child Support Order
The other path is filing a motion directly with the court. This is more common when your case isn’t being enforced through an agency, when you need to move faster than the administrative process allows, or when the issues are complicated enough to warrant a judge’s attention. Court filings give you more control over the timeline and let you present evidence directly. They also mean handling the paperwork yourself or hiring an attorney, paying a filing fee, and formally serving the other parent.
The two options aren’t mutually exclusive. If the agency denies your request, you can still take the matter to court on your own.
When You Can Ask for an Increase
Federal law splits requests into two categories. If three or more years have passed since your order was established or last reviewed, either parent can request a review and the state must conduct one. No proof of changed circumstances is required at the three-year mark.1Office of the Law Revision Counsel. 42 USC 666 – Requirement of Statutorily Prescribed Procedures to Improve Effectiveness of Child Support Enforcement The agency applies the current guidelines to updated income figures and checks whether the result differs from your current order. If it does, the order gets adjusted.
Before the three-year mark, you need to demonstrate a substantial change in circumstances since the last order.1Office of the Law Revision Counsel. 42 USC 666 – Requirement of Statutorily Prescribed Procedures to Improve Effectiveness of Child Support Enforcement Courts look for significant, lasting shifts. Temporary income dips and one-time expenses generally don’t qualify. Changes that do include:
- Higher income for the paying parent, such as a promotion, new job, or substantial raise.
- Lower income for the receiving parent, whether from a layoff, reduced hours, or disability.
- Increased expenses for the child, such as a new medical condition, specialized education, or therapy that didn’t exist when the order was entered.
- A changed custody arrangement, where the child now spends substantially more time with you.
Many states also apply a minimum threshold before they’ll process a modification. A common benchmark is a 15% to 20% difference between the current order and what the guidelines would produce today. If the recalculated amount falls below that threshold, the court or agency may decline to modify even when circumstances have technically shifted.
How the Guidelines Actually Decide the Number
Every state maintains child support guidelines, and there’s a legal presumption that the amount produced by those guidelines is correct. A judge can deviate, but only by making a specific written finding that the guideline amount would be unjust or inappropriate in your case.3Office of the Law Revision Counsel. 42 USC 667 – State Guidelines for Child Support Awards
Most states use an income shares model, which estimates what the parents would have spent on the child if they lived together and splits that amount based on each parent’s share of combined income. A handful of states use a percentage-of-income model that calculates support as a percentage of the paying parent’s earnings only. Knowing which model applies in your state helps you predict how a change in either parent’s income will move the calculation.
This is where the real leverage sits. The question isn’t whether a judge thinks you deserve more money. It’s whether updated numbers plugged into the guidelines produce a materially different result. If they do, the presumption favors adjusting the order to match.
When the Other Parent Is Deliberately Underearning
One of the most frustrating scenarios is a paying parent who takes a lower-paying job, drops to part-time, or becomes voluntarily unemployed to shrink the calculation. Courts address this through imputed income. If a judge finds that a parent is deliberately suppressing earnings to avoid a fair support obligation, the court can base support on what that parent is capable of earning rather than what they actually bring home.
The analysis turns on two questions: the parent’s earning capacity based on education, work history, and health, and whether the reduced income reflects a genuine choice (like a legitimate career change) or a bad-faith move to manipulate the numbers. Self-employed parents get extra scrutiny, since reported income may not reflect actual cash flow.
If you believe the other parent is sandbagging their income, raise it in your petition and bring evidence: their qualifications, prior earnings, and job market data showing they could be earning more. Proving earning capacity requires building a factual case beyond your own finances, and this is one area where an attorney can make a real difference.
What to Gather Before You File
The process runs on documentation. The more organized your evidence is upfront, the smoother everything goes.
Financial Records
The court or agency needs a clear picture of both parents’ current finances to run the guideline calculation. Pull together several months of recent pay stubs, your most recent W-2, and federal tax returns from the past one to two years. If you’re self-employed, bring profit-and-loss statements and bank records showing actual cash flow. If the other parent won’t share their financials voluntarily, you can use discovery tools during a court case to compel disclosure. That isn’t an issue with agency review, since the agency can pull wage data from employer reports and tax filings.2ACF. Changing a Child Support Order
Proof of the Child’s Needs
If your argument rests on increased expenses for the child, bring receipts. Medical bills, insurance premium statements, therapy invoices, tuition records, and costs tied to activities or equipment all help. Don’t just describe these expenses in your petition and expect the court to take your word for it. Concrete documentation is what separates a successful petition from a denied one.
Legal Forms
For a court filing, you’ll complete a modification petition (often titled Petition to Modify Child Support or Motion to Modify) and a financial disclosure form (called a Financial Affidavit or Income and Expense Declaration depending on your jurisdiction). The financial form requires you to swear under oath to your income, assets, debts, and monthly expenses. These forms are usually available for free on your local court’s website. Fill them out completely. Incomplete forms are one of the most common reasons filings get rejected or delayed.
Filing and Serving the Other Parent
File your completed petition and financial disclosure with the clerk of the court that issued your original order. You’ll pay a filing fee, and the amount varies widely by jurisdiction. If you can’t afford it, you can file a fee waiver application (sometimes called an in forma pauperis petition) at the same time. If approved based on your income, the court waives the fee entirely.
After filing, you must formally notify the other parent through service of process. You cannot simply hand the papers to them yourself or send a text. Acceptable methods typically include having the local sheriff’s department deliver the documents, hiring a private process server, or sending them by certified mail with a return receipt. The return receipt or the server’s affidavit becomes your proof that the other parent received notice.
Why Your Filing Date Matters
File sooner rather than later. Under federal law, past-due child support payments become automatic judgments the moment they come due and cannot be retroactively reduced by any state.1Office of the Law Revision Counsel. 42 USC 666 – Requirement of Statutorily Prescribed Procedures to Improve Effectiveness of Child Support Enforcement A modification only applies to the period during which a petition is pending, and only from the date the other parent receives notice that you’ve filed.4eCFR. 45 CFR 303.106 – Procedures to Prohibit Retroactive Modification of Child Support Arrearages
In practical terms, the clock starts when your motion is filed and the other parent is served, not when the judge signs the new order. If the court eventually grants your increase three months later, the higher amount can be made effective back to the filing date. It won’t reach any further. Every month you wait to file while the old, lower order stays in place is a month of higher support you can never recover.
What Happens After You File
The Other Parent’s Response
Once served, the other parent gets a set window to file a written response, typically 20 to 30 days depending on jurisdiction. Their response will agree with your request, contest it, or propose a different amount. If they don’t respond at all, you may be able to request a default judgment, though family courts treat defaults cautiously and often still require a hearing.
Mediation
Many courts require both parents to attempt mediation before scheduling a full hearing. Mediation is a confidential session with a neutral third party who helps you negotiate a resolution. It isn’t binding unless you reach an agreement, and the mediator doesn’t decide the outcome. If you do agree on a new amount, the mediator drafts it into a written agreement that goes to the judge. Once the judge signs it, that agreement becomes your new enforceable order.
The Court Hearing
If mediation doesn’t produce an agreement, the case goes to a hearing. The judge reviews the financial disclosures, examines evidence of the child’s needs, and hears testimony from both parents. The core question is whether today’s numbers plugged into the state’s guidelines produce an amount meaningfully different from the current order. If they do, the judge enters a new order reflecting the updated calculation.3Office of the Law Revision Counsel. 42 USC 667 – State Guidelines for Child Support Awards
Come prepared with organized copies of everything you filed, plus any additional evidence that supports your case. If the other parent has claimed reduced income, bring anything that contradicts it: social media posts showing expensive purchases, public records of property ownership, or evidence of their professional qualifications. Judges appreciate brevity and focus. Stick to the financial facts rather than relitigating old grievances.
Check Your Order for a Cost-of-Living Clause First
Some child support orders include a built-in cost-of-living adjustment clause that automatically raises payments each year based on an inflation index like the Consumer Price Index. If your order has one, you may not need to file a modification at all for routine inflation-driven increases. Read your existing order carefully before starting. States can also apply cost-of-living formulas as part of the three-year review cycle rather than requiring a full guideline recalculation.5eCFR. 45 CFR 303.8 – Review and Adjustment of Child Support Orders
If your order doesn’t include a cost-of-living clause and inflation has meaningfully eroded the value of your payments, that erosion combined with other changed circumstances can strengthen a modification petition. A dollar amount that was adequate five years ago may fall well short of what the guidelines would produce today simply because wages and costs have moved.