Child support and
spousal support.
One runs on a formula. The other runs on discretion. Understanding which is which tells you where there is room to argue.
Child support
A statewide formula, not a negotiation.
California child support is calculated by guideline formula built primarily on both parents' incomes and the percentage of time the child spends with each parent. Courts have very little discretion to depart from it.
Timeshare is the lever most people miss.
Because parenting time is an input to the formula, custody and support are mathematically linked. A meaningful change in the schedule changes the number.
Add-ons are shared on top of the base.
Childcare needed for work, the child's health insurance premium, and uninsured medical costs are generally split — usually equally — separately from the guideline amount.
Income means more than a paycheck.
Bonuses, self-employment income, rental income, and perks can all count. Where a parent is deliberately underemployed, a court can impute income based on earning capacity.
Spousal support
Temporary support and long-term support are different questions.
Temporary support stabilizes both households while the case is pending and is often set by local formula. Long-term support, ordered at judgment, is discretionary and weighs a statutory list of factors.
The factors that actually move the number.
Length of the marriage, the marital standard of living, each spouse's earning capacity and health, contributions to the other's education or career, and whether one spouse's ability to work was affected by caring for children.
Duration follows a rough rule of thumb — until it doesn't.
For marriages under ten years, support generally lasts about half the length of the marriage. Marriages of ten years or longer have no presumptive end date, which does not mean support is permanent.
A domestic violence finding cuts against support.
Where there is a finding of domestic violence against the spouse asking for support, California law creates a presumption against awarding it — hard to overcome, and in some cases absolute.
Changing an order
Neither kind of support is set in stone.
Both can be modified when circumstances meaningfully change: job loss, a raise, a new schedule, remarriage, retirement. What you cannot do is stop paying and sort it out later — arrears accrue with interest and are extremely difficult to erase.
Move quickly when income drops.
A modification generally reaches back only to the date you filed the request, not the date your circumstances changed. Waiting six months to file usually costs you those six months.
Child support is formula-driven; spousal support is discretion structured by statute. These are the rules that decide most disputes.
Authorities current as of 2025. Case law changes; nothing here is a substitute for advice on your own facts.
Get answers about your situation.
This guide is general information — a consultation is where it becomes advice.
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