How California calculates spousal support
California's official term is "spousal support," not alimony, and the state is one of the clearest examples of a jurisdiction that gives judges broad discretion instead of a calculation. There is no statutory formula for long-term, post-judgment spousal support anywhere in the California Family Code. Instead, Family Code §4320 lists 14 factors a judge must consider, covering the earning capacity of each spouse relative to the marital standard of living, the extent to which the supported spouse contributed to the other's education or career, the supporting spouse's ability to pay, the needs and obligations of each party, the duration of the marriage, the age and health of the parties, documented domestic violence history, the immediate tax consequences of an order, the balance of hardships between the parties, the goal that the supported spouse become self-supporting within a reasonable period, any criminal conviction for domestic abuse against the other spouse, and a final catch-all for anything else the court finds just and equitable.
Because there is no §4320 formula, the calculator above does not attempt to reproduce California law with precision — it applies the same kind of common guideline math used nationally so you have a number to plan around, and labels it clearly as non-statutory. It's worth noting that some California counties do use a separate guideline formula, generated by local family-law software, for temporary support while a case is pending — but that guideline comes from local court rule, not from §4320, its exact percentages vary by county, and it does not apply to the long-term spousal support decision a judge makes after weighing the §4320 factors.
Duration in California turns heavily on how long the marriage lasted. For a marriage under 10 years — a "short duration" marriage — a commonly applied guideline is that a "reasonable period" of support runs about half the length of the marriage. That is a guideline, not a mandatory cap, and courts keep discretion to depart from it based on the §4320 factors. Marriages of 10 or more years are presumed to be "of long duration" under Family Code §4336. For those marriages, the court retains indefinite jurisdiction over spousal support — there is no automatic termination date built into the order. That does not mean support runs forever automatically; it means the court keeps authority to revisit, modify, or end support later if circumstances change, rather than the case simply closing on a fixed date. Courts can also find a marriage under 10 years to be "of long duration" in some circumstances based on the specific facts.
California is a no-fault divorce state, and ordinary marital misconduct — including adultery — is not one of the §4320 factors and generally does not affect a support award. The exception is domestic violence: a documented history of abuse by one spouse against the other is an explicit §4320 factor, and a criminal conviction for domestic violence against the supported spouse (or their child) can bar or reduce that spouse's right to support. There is no marriage-length threshold that must be met just to be eligible for spousal support in California, unlike Texas — eligibility itself isn't gated by years married; instead, marriage length shapes the duration presumption under §4336.
The most significant recent change is not to the §4320 factors themselves but to how support is taxed. SB 711, signed October 1, 2025 and effective January 1, 2026, ends California's prior state-level conformity gap with the federal Tax Cuts and Jobs Act. For spousal support orders or agreements dated January 1, 2026 or later, payments are no longer deductible by the payor or taxable to the recipient for California state tax purposes — bringing state tax treatment in line with the federal rule that has applied since 2019. Orders dated before January 1, 2026 keep the prior California tax treatment unless a later modification expressly adopts the new rule. This is a tax-treatment change, not a change to the §4320 factors or the §4336 long-duration presumption, but because it affects each spouse's after-tax income, family-law software and attorneys are now factoring it into support negotiations.
Last reviewed: July 2026. Statute citations: Family Code §4320 (factors) and Family Code §4336 (long-duration marriage / indefinite jurisdiction presumption).
Frequently Asked Questions
Does California have an alimony formula?
Not for long-term, post-judgment spousal support. Family Code §4320 gives judges a list of 14 factors to weigh instead of a calculation. A temporary, pre-judgment guideline formula is used in some counties before trial, but it comes from local court rule and software, not from §4320 itself, and the exact percentages vary by county.
How long does spousal support last in California?
For marriages under 10 years, a common guideline is about half the length of the marriage, though this is not a mandatory cap. For marriages of 10 or more years, California treats the marriage as "of long duration" under Family Code §4336 — the court keeps open jurisdiction over support with no automatic end date, though it can still be modified or ended later if circumstances change.
Does adultery affect alimony in California?
Generally no. California is a no-fault divorce state and ordinary marital misconduct is not one of the §4320 factors. The exception is documented domestic violence: a documented history of abuse, or a criminal conviction for domestic violence against the other spouse, can reduce or bar support.
Is California alimony taxable in 2026?
It depends on the order date. Federal law already treats alimony from divorces finalized in 2019 or later as not deductible to the payer and not taxable to the recipient. SB 711 (effective January 1, 2026) ends California's separate state tax conformity gap — for orders dated January 1, 2026 or later, payments are no longer deductible or taxable for California state tax purposes either. Orders dated earlier keep the prior state tax treatment unless later modified.
What are the California Family Code §4320 factors?
Fourteen factors including each spouse's earning capacity relative to the marital standard of living, the supported spouse's contribution to the other's education or career, the supporting spouse's ability to pay, each party's needs and obligations, the duration of the marriage, age and health, documented domestic violence history, tax consequences, and the goal that the supported spouse become self-supporting within a reasonable time.