They Lied About Their Income. Can You Get Your Child Support Back?

Yes, sometimes you can. If your co-parent hid income to get a higher child support order, California law gives you a way to undo that order and recover what you overpaid. But the window to act is short.

Here is a scenario: One parent loses their job and asks the court to raise child support. A week later, that parent lands a new job that pays even more than the old one, and says nothing. Relying on the financial disclosures showing zero income, the other parent signs an agreement that substantially increases support.

Months later, the truth comes out. The paying parent asks for the extra money back. The response: "Sorry, support can't be changed retroactively."

Why support usually can't be changed backward

That response is half right. As a general rule, a court can only change child support going forward, back to the date someone filed a request to modify it. You can't go back and ask a judge to recalculate support for months that have already passed just because circumstances changed.

This rule exists for good reason. Both parents need to be able to rely on a support order and plan their lives around it. But the rule assumes the order was based on honest information in the first place.

The exception: fraud and perjury

When a support order was obtained through fraud or a false financial disclosure, the question changes. You are no longer asking the court to modify support. You are asking the court to set aside the order entirely because it never should have been made.

California law specifically allows this. A support order can be set aside for actual fraud, or for perjury in a party's income and expense declaration or financial disclosures. The same is true when the order came from an agreement the other parent signed because they relied on those false numbers.

The catch is timing. You generally have six months to file your request. That clock starts when you discovered the fraud, or when you reasonably should have discovered it, not when the lie was told. Wait too long and you may lose the remedy, no matter how clear the dishonesty was.

What a set-aside can get you

When a court sets aside an order obtained by fraud, it puts the parties back where they were before the order was made. In practical terms, the original request to change support is still open, and the court can decide it again using the true numbers. Courts have recognized that this lets the corrected support amount reach back to the date the original request was filed.

That means the paying parent can recover overpayments that would otherwise be lost. The court can also order sanctions against a parent who lied on their financial disclosures, which can include paying the other side's attorney's fees. Judges take false income and expense declarations seriously, because the entire support system depends on them.

If you suspect hidden income

Act quickly. The six-month window is the single most important thing to know here. Write down when and how you learned the truth, because that date may become the center of the case.

Gather proof before you confront anyone. Pay stubs, social media posts about a new job, employer information, and bank records all matter. In contested cases, attorneys can subpoena employment and payroll records to confirm what the other parent was earning and when.

Don't sign a support agreement based on numbers you can't verify. If a parent's income drops to zero right before a support hearing, it is reasonable to ask for documentation of the job search, unemployment benefits, and any new offers before agreeing to anything.

And talk to a family law attorney before you simply ask for the money back. A demand letter alone won't get you a refund. The remedy comes through a properly filed request to set aside the order, and getting the timing and the evidence right is what makes it work.

At Gordon Family Law, we help parents and spouses understand their financial rights before and after divorce. If you think a support order was based on false information, contact us to talk through your options.