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Demonstrating a “substantial change” in family law modifications

On Behalf of | Jul 7, 2025 | Family Law

Life doesn’t stay the same after a family court order; jobs change, kids grow up, and living situations shift. When this happens, the original court order might no longer fit the family’s needs, and a modification may be appropriate. In California, a person must show a “substantial change in circumstances” to modify certain family law orders, such as child support or spousal support.

What courts look for

A “substantial” change means something important has happened since the last order that affects the reason for that order, such as:

  • Job loss or major income changes: If a person loses their job, takes a lower-paying job, or retires, they may not be able to afford support payments. On the other hand, if someone’s income increases a lot, the other parent might ask for a raise in support.
  • Changes in parenting time: If one parent starts spending a lot more or a lot less time with the child, the court may see that as a reason to change child support amounts. Parenting time affects the child’s expenses and needs.
  • Relocation: When a parent moves far away, it can change the child’s school, routine, or ability to see the other parent. Courts may see this as a big enough reason to review parenting plans or support orders.
  • Health issues: Serious illness or disability that affects a person’s ability to work or care for the child can also count. The court looks at how the condition affects daily life and finances.

While these are some of the most common reasons for modifications, other situations of similar significance could merit changes to a court order.

How the court decides

The court won’t automatically change the order just because someone asks. The court will want proof of the change and how it makes the current order unfair or unworkable, so the person asking for the change must show evidence. 

The court reviews the facts and decides whether the change affects the best interest of the child or the fairness of the support amount. Judges consider both parents’ current circumstances, not just what has changed.

A strong request for modification shows the full picture of what’s different and why the change matters. The court aims to keep orders fair and practical as life moves forward.

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