Child support is due on the recurring dates written into your court order, starting from the effective date the judge sets, which is often the day the petition was first filed rather than the day the order was signed. So the real answer to when child support is due comes from two lines on the first page of your order: the effective date, and the payment schedule. Miss either one and the enforcement system begins moving on its own.
The Effective Date on Your Order
Your obligation begins on the effective date the judge or administrative officer designates, not on the day you receive the paperwork. That date appears on the first page of the formal order. Courts frequently set it retroactively to the date the petition was filed with the clerk, so if several months passed between filing and the final order, you may owe a lump sum for that entire gap the moment the order is entered.
The “date of entry” is the day the clerk officially stamps and records the order, and that is the date used to determine when the first installment becomes overdue. A judge who signs an order on March 15 but sets January 1 as the effective date has made you responsible for January, February, and part of March. Courts often build a separate payment schedule for this retroactive balance so you can pay it down over time alongside your regular monthly amount.
How Often Payments Are Due
Every order sets a recurring schedule. The most common frequencies are weekly, biweekly, and monthly. Judges often align due dates with the paying parent’s pay periods to make the math easier. An order for $400 a month, for example, might be split into two $200 payments due on the 1st and the 15th.
Treat the due date in the order as a firm deadline. It is not a suggestion, and enforcement agencies do not have to wait until you are significantly behind to begin collection action. Grace periods and enforcement timelines vary by state, so the safest practice is to pay on or before the date listed. Consistent on-time payments keep interest from accumulating and keep you in good standing with the court.
How the Money Actually Moves
Federal law requires virtually every child support order to include an income withholding provision. Under 42 U.S.C. § 666, your income becomes subject to automatic withholding on the effective date of the order, whether or not you are behind.1Office of the Law Revision Counsel. 42 USC 666 – Requirement of Statutorily Prescribed Procedures to Improve Effectiveness of Child Support Enforcement The only exceptions are a court finding of good cause or a written agreement between the parents to do it differently.
When income withholding applies, the child support agency sends your employer an Income Withholding for Support order. Your employer deducts the amount from each paycheck and forwards it to the state disbursement unit.2Administration for Children & Families. Processing an Income Withholding Order or Notice Child support withholding takes priority over nearly every other garnishment; the only exception is an IRS tax levy that predates the child support order. If your order uses withholding, you don’t do anything on each due date. The paycheck does it.
If your order does not use automatic withholding, because you’re self-employed, your income is irregular, or both parents agreed to another arrangement, you send payments directly to your state’s disbursement unit (SDU). Every state operates one. Your order or your child support agency will tell you the mailing address and any online portal.
Put your case number (sometimes called a IV-D number) on every check, money order, or online transaction. Include any payment coupon or voucher your state provides. A missing or wrong case number can cause the money to be misapplied, which shows up as a missed payment even though you paid. Keep confirmation receipts, transaction numbers, and copies of cleared checks. Electronic payments typically clear in one to four business days; mailed checks can take three to five business days or longer, so send early enough that the SDU receives the payment by the due date.
One warning about informal payments. If you ever hand cash to the other parent, write them a personal check, or buy things for the child instead of paying through the SDU, you will have a very hard time getting credit for those payments later. Courts generally require proof that the money went through the SDU. Getting credit for direct payments usually means filing a motion and producing canceled checks, signed receipts, or bank records.
What Happens When a Payment Is Late
Child support enforcement is one of the most aggressive debt-collection systems in the country, and agencies can use most of their tools without going back to court.
Interest Starts Running
Roughly two-thirds of states charge interest on unpaid support. Rates range from around 4 percent per year in some states to 12 percent per year in others, with several states tying the rate to market factors that fluctuate. Where it applies, interest compounds on the outstanding balance and can add thousands of dollars to what you owe.
Your Tax Refund Gets Intercepted
The federal tax refund offset program lets child support agencies seize your federal (and often state) income tax refund to cover past-due support. The arrears threshold is $500 in most cases, or $150 if the custodial parent receives public assistance.3Administration for Children & Families. When Is a Child Support Case Eligible for the Federal Tax Refund Offset Program
Your Passport Can Be Denied or Revoked
Once your arrears exceed $2,500, the state agency can certify you to the federal Office of Child Support Services, which forwards your name to the State Department. Any passport application is then denied, and an existing passport can be revoked or restricted.4Office of the Law Revision Counsel. 42 USC 652 – Duties of Secretary
Licenses and Credit
State agencies can suspend your driver’s license, professional licenses, and recreational licenses like hunting or fishing permits. The arrears threshold varies by state; some agencies act after four months of missed payments, others sooner. Delinquencies also get reported to the credit bureaus and can stay on your report for years.
Contempt and Federal Criminal Charges
A state court can hold you in contempt for disobeying a support order, with fines or jail time. Federally, willfully failing to pay support for a child living in another state is a crime under 18 U.S.C. § 228. More than one year behind or more than $5,000 owed is a misdemeanor carrying up to six months in prison. More than two years behind or more than $10,000 owed is a felony carrying up to two years.5U.S. Department of Justice. Citizens Guide to U.S. Federal Law on Child Support Enforcement
If You Can’t Pay the Full Amount, File to Modify Immediately
If your financial situation changes substantially, you lose your job, become disabled, or your income drops, you can ask the court or child support agency to review and modify the amount. Either parent can request a review based on a substantial change in circumstances, and most agencies will also conduct a review at least every three years on request.6Administration for Children & Families. Changing a Child Support Order
Here is the rule that catches people off guard. You cannot get retroactive relief for installments that have already come due. Under federal law, every past-due installment becomes a judgment the moment it is due, and no state can reduce it after the fact.1Office of the Law Revision Counsel. 42 USC 666 – Requirement of Statutorily Prescribed Procedures to Improve Effectiveness of Child Support Enforcement A modification can only take effect, at the earliest, from the date you file the petition and give notice to the other parent. Wait six months after losing your job and you owe the full original amount for those six months regardless of what the modified order says going forward. File the petition the moment your circumstances change.
When the Obligation Ends
Child support does not run forever, but it also does not always stop automatically on a specific birthday. In most states the obligation ends when the child turns 18. Some states extend it to 19 if the child is still in high school. A few, most notably New York, continue it to 21. A child who marries, joins the military, or becomes financially self-supporting before reaching the age of majority may be considered emancipated, which can end the obligation early. Some jurisdictions extend support past the age of majority for a child with a disability or one pursuing post-secondary education.
Even when a child ages out, any arrears you’ve built up do not vanish. You still owe every dollar that accumulated while the order was active. If you believe your obligation should end, read the specific terms of your order and, if necessary, file a motion to formally terminate the payments rather than simply stopping on your own.