California temporary spousal support
How California courts may estimate temporary spousal support.
California Courts says judges often use a formula as a guide or starting point for temporary support. The common formula shown by the state court is 40% of the higher earner's net monthly income minus 50% of the lower earner's net monthly income. The same state guidance warns that a local court may use that formula or something different. [1]
Common temporary formula: 40% of higher net income − 50% of lower net income.
The result is a temporary-support illustration, not a statewide binding amount. Judges can consider need, ability to pay, child-related costs, medical bills, savings, and other circumstances. [1]
California long-term spousal support
California does not use the temporary formula to set long-term support.
Family Code §4320 requires the court to consider factors including earning capacity, the marital standard of living, ability to pay, needs, assets, marriage duration, age and health, domestic violence, tax consequences, and the balance of hardships. California Courts therefore says there is no math formula or easy way to calculate long-term support. [2][4]
Section 4320 states that, except for a marriage of long duration, a reasonable period for the supported spouse to become self-supporting generally is one-half the length of the marriage. Section 4336 creates a presumption that a marriage of 10 years or more is a marriage of long duration for purposes of retaining court jurisdiction. That does not create a guaranteed lifetime award. [2][3]
Questions about California alimony calculations.
Does California use the 40% minus 50% formula for every alimony case?
No. California Courts describes it as a common temporary-support formula and says your court may use it or something different. Long-term support uses Family Code §4320 factors instead of that formula. [1][2]
Does a 10-year marriage mean alimony lasts forever in California?
No. A marriage of 10 years or more is presumed to be a marriage of long duration for retained jurisdiction under Family Code §4336. The court can still set, modify, or end support based on the law and the parties' circumstances. [3]
Can this calculator predict a final California alimony amount?
No. California Courts states that long-term support does not have a mathematical formula. This calculator therefore limits its dollar estimate to the common temporary formula and shows only general duration guidance for long-term support. [4]
California alimony sources and calculator limits
- 01California Courts: Temporary spousal support and the common formula
- 02California Legislature: Family Code §4320
- 03California Legislature: Family Code §4336
- 04California Courts: Long-term spousal support
Public-source check: September 6, 2026. Current calculator rules release: 0.18.0. Source checking and automated testing are not attorney review or a guarantee of legal correctness.