The child support review process is a formal reassessment of your existing order using current financial information from both parents. You can request one every three years without showing anything has changed, or sooner if a significant change in circumstances has occurred. The review runs through either your state’s child support agency or the court that issued the original order, and it ends with a new order that replaces the old amount.
When You Can Ask for a Review
Federal law gives every parent two separate paths to a review, and they work differently.
The Three-Year Review
Every state must offer a review of child support orders at least once every 36 months, and either parent can request it.1Office of the Law Revision Counsel. 42 USC 666 – Requirement of Statutorily Prescribed Procedures You do not need to prove anything has changed. The state simply runs current financial information through its support guidelines and checks whether the existing amount still matches. States must notify both parents of this right at least once every three years.2eCFR. 45 CFR 303.8 – Review and Adjustment of Child Support Orders
Some states use shorter review cycles. A handful build automatic cost-of-living adjustments into their orders so the amount changes with inflation without any filing. If your state uses that method, you still have the right to contest the adjustment within 30 days and request a full guideline review instead.1Office of the Law Revision Counsel. 42 USC 666 – Requirement of Statutorily Prescribed Procedures
A Substantial Change in Circumstances
Outside the three-year cycle, you can request a review anytime by showing a substantial change in circumstances. That means a significant, lasting event affecting either parent’s ability to pay or the child’s needs. Common examples:
- Involuntary job loss or long-term disability that significantly reduces the paying parent’s income
- A major income increase for either parent, such as a promotion or new high-paying position
- A shift in custody, such as a child moving from one parent’s home to the other’s
- New major expenses for the child, such as treatment for a chronic illness or specialized educational services
The parent requesting the change carries the burden of proving both that it happened and that it justifies a new amount.1Office of the Law Revision Counsel. 42 USC 666 – Requirement of Statutorily Prescribed Procedures Some states set numerical thresholds, such as a percentage change in income or a minimum dollar difference between the current order and the new calculation, before they will adjust. These thresholds vary widely, so check your state’s guidelines before filing.
Remarriage by itself typically does not qualify. Courts view child support as an obligation between the biological parents, and a new spouse’s income generally does not factor into the calculation. Having additional children with a new partner can affect the formula and is recognized in most states as a potential basis for a review, but approval is not guaranteed; the court weighs the existing children’s needs against the new financial picture.
Two Ways to Start the Process
You can go through your state’s child support enforcement agency or file directly with the court. Which path fits depends on how your order was established and whether an agency already manages your case.
Through the State Agency
If a state child support agency (sometimes called a Title IV-D agency) manages your case, you can request a review by submitting a form, commonly titled “Request for Review,” along with a financial affidavit and supporting documents. Most agencies provide this service at no charge. The agency notifies the other parent and applies the state’s guidelines.
This route tends to be less adversarial and involves less paperwork. The trade-off is that agency reviews can take longer, and you have less control over how the case moves.
Filing a Motion With the Court
You can also petition the court that issued your original order. That means filing a document typically called a “Motion to Modify Child Support,” paying a filing fee, and formally serving the other parent. Filing fees vary by jurisdiction. If you cannot afford the fee, you can request a waiver through a poverty affidavit or similar hardship form.
Service means the other parent must receive official notice of your petition, usually by certified mail or a process server. Filing does not count until service is complete, and the date of service directly affects how far back any change can reach.
Documents You Need to Gather
Both paths require a financial disclosure, often called a financial affidavit or income and expense statement. Most of the preparation work happens here, because you need documentation for every number on the form.
Income
You need proof of income from every source. At a minimum:
- Your four most recent consecutive pay stubs
- Federal and state tax returns for the past one to three years, with W-2s and any 1099s
- Records of unemployment benefits, disability payments, Social Security, rental income, or investment earnings
Self-employment adds more. Expect to provide business tax returns, profit-and-loss statements, and bank statements covering at least the past two to three years. Courts look at net income after legitimate business expenses, not gross receipts. A court that suspects expenses are inflated to hide income can disallow deductions and calculate support on a higher figure.
Child-Related Expenses
Pull receipts and billing statements for costs tied to the child, including health and dental insurance premiums, daycare or after-school care, and extraordinary expenses like private school tuition, therapy, or uninsured medical treatment. These figures feed into the calculation alongside both parents’ incomes.
What Happens After You File
Once the review begins, both parents submit updated financial information and the agency or court applies the state’s child support guidelines to the new numbers. Federal regulations require guidelines to be based on specific numeric criteria and to account for the noncustodial parent’s earnings, income, and ability to pay. States must also build in a low-income adjustment, such as a self-support reserve, that prevents the order from pushing the paying parent below a basic subsistence level.3eCFR. 45 CFR 302.56 – Guidelines for Setting Child Support Orders
How Long It Takes
Federal regulations require states to complete the review within 180 calendar days of receiving the request or locating the other parent, whichever is later.2eCFR. 45 CFR 303.8 – Review and Adjustment of Child Support Orders Contested cases often take longer, particularly when one parent is hard to locate or disputes the financial disclosures.
Agreement, Hearing, or Default
If both parents agree on a new amount, they can sign a stipulated agreement that a judge then approves as a binding order. Mediation, in which a neutral third party helps both sides negotiate, is a common way to reach that agreement without a contested hearing. Discussions during mediation generally cannot be used against either parent in court if the process breaks down.
If you cannot agree, the case moves to an administrative hearing or court hearing where a judge reviews the evidence, applies the guidelines, and sets the new amount. If the other parent is properly served but ignores the petition, the court can enter a default order based on whatever financial evidence is available. Ignoring a modification petition is never a viable strategy.
Your existing order stays fully in effect until the new one is signed. You must continue paying, or are entitled to receive, the current amount throughout the entire review.
File Immediately: Past-Due Support Cannot Be Reduced Later
This is where people get into serious trouble. Under federal law, every child support payment becomes a judgment the moment it comes due, and no court in any state can retroactively reduce or forgive the amount owed.1Office of the Law Revision Counsel. 42 USC 666 – Requirement of Statutorily Prescribed Procedures This is the Bradley Amendment. If you lose your job today and wait six months to file, you owe the full original amount for each of those six months regardless of what you actually earned.
The only narrow exception: a modification can potentially reach back to the date the petition was filed and the other parent received notice.1Office of the Law Revision Counsel. 42 USC 666 – Requirement of Statutorily Prescribed Procedures Not a day earlier. Every week you delay is another week of arrears that can never be reduced, and those arrears accrue interest, trigger enforcement actions like wage garnishment or license suspension, and can follow you for decades.
The same urgency runs the other direction. If you are the custodial parent and believe the other parent is earning significantly more than when the order was set, filing sooner means any increase applies from an earlier date.
Situations That Change the Analysis
Voluntary Underemployment
Quitting a job or taking a large pay cut will not automatically lower your obligation. Courts have broad power to calculate support based on what you could be earning rather than what you actually earn. Federal guidelines require that when a state imputes income, the calculation must account for the parent’s specific circumstances, including employment history, education and training, job skills, health, age, criminal record, and the local job market.3eCFR. 45 CFR 302.56 – Guidelines for Setting Child Support Orders Some states require a finding of bad faith before imputing income; others look only at whether the choice to earn less was voluntary.
Income is typically not imputed in genuine layoffs where the parent is actively looking for work, inability to work due to medical condition or disability, and full-time military service. Documented, legitimate reasons for reduced earnings hold up. Unexplained departures from well-paying jobs, or lifestyles that do not match reported income, do not.
Incarceration
Federal regulations prohibit states from treating incarceration as voluntary unemployment when setting or modifying child support.3eCFR. 45 CFR 302.56 – Guidelines for Setting Child Support Orders Before this rule took effect in 2017, many incarcerated parents accumulated massive arrears because courts refused to lower their orders. Now states must allow incarcerated parents to petition for a review based on reduced ability to pay, and some states automatically initiate a review when they learn a noncustodial parent will be incarcerated for more than 180 days.2eCFR. 45 CFR 303.8 – Review and Adjustment of Child Support Orders
The Bradley Amendment still applies. Arrears that accumulated before the petition was filed cannot be erased, so an incarcerated parent, or a family member acting on their behalf, should file for a review as early as possible.
Cases Involving Public Assistance
When the custodial parent receives Temporary Assistance for Needy Families, the rules shift. As a condition of receiving benefits, the custodial parent must assign their right to collect child support to the state. The state then keeps most or all of the collected support to reimburse itself. Some states pass a portion through to the family, but amounts vary. Arrears that accumulate during the TANF period are generally treated as government debt, so the custodial family may never see that money even after leaving the program. In these cases, the state agency may initiate reviews on its own timeline because it has a direct financial interest in the amount being accurate.
When Support Ends
Child support does not last forever, but the termination point varies. Most states end the obligation when the child turns 18, though many extend it through high school graduation if the child is still enrolled. A few states require support until 19 or even 21 in certain circumstances. Support can also end early if the child marries, joins the military, or is legally emancipated. Courts can order indefinite support for a child with a severe physical or mental disability that prevents self-sufficiency. The existing order typically does not terminate automatically. The paying parent usually must file a motion to end the obligation, and payments remain due until the court enters a new order.