Modifying Child Support in California: When You Can Increase the Order

California Child Support Recovery System | Justice Foundation

A child support order is not permanent. California law allows either parent to request modification when there has been a material change in circumstances since the order was entered. If the paying parent’s income has increased significantly since the original order — through a raise, a new job, a business that grew — you may be entitled to substantially higher support going forward.

The Material Change Standard

California courts will modify a child support order when the requesting parent demonstrates a material change in circumstances. This includes: a significant increase or decrease in either parent’s income, a change in custody or timeshare arrangement, a change in the child’s needs (medical expenses, educational costs, special needs), or passage of time such that the existing order no longer reflects current circumstances. The change must be genuine and significant — courts don’t modify orders for minor income fluctuations.

How to Discover the Paying Parent’s Current Income

If you suspect the paying parent’s income has increased but they haven’t disclosed it, a modification proceeding gives you discovery tools to find out. Both parents are required to exchange current income and expense declarations when a modification is requested. You can subpoena the paying parent’s employer for pay stubs and W-2s, subpoena banks for deposit records, and request production of the last two years of tax returns. DCSS can also run employment and wage database searches through the EDD and the National Directory of New Hires.

California’s Guideline Formula

California uses a mandatory computer-generated guideline formula to calculate child support, taking into account both parents’ net disposable income and the percentage of time each parent has physical custody. The formula is not discretionary — courts must follow it unless specific statutory exceptions apply. If the paying parent’s income has doubled since the original order, the guideline amount has likely changed significantly. A free calculation is available through DCSS or the California Courts’ online child support calculator.

Retroactivity: When Does the New Amount Start?

A modification is effective from the date the motion to modify was filed — not the date the court rules on it. This means filing promptly when you know circumstances have changed is critical. If the paying parent received a major raise six months ago and you file for modification today, you can only collect the increased guideline amount from today’s filing date forward, not from when the raise occurred. File as soon as you have evidence of the material change.