Updated for 2026 guidelines
California Spousal Support Calculator 2026
California splits spousal support into two different worlds. Temporary support, while the case is pending, is commonly set with county guideline formulas. Long-term support may not use a formula at all. This tool estimates the first and refuses to invent the second.
Reviewed by SupportDecode Editorial Team Page content reviewed Sources Methodology Update log
Estimate temporary California spousal support
Estimated temporary spousal support (county practice): $1,700.00
Practice-based estimate; the statute prescribes no exact formula for this figure.
| Line item | Amount |
|---|---|
| 40 percent of payor monthly net income (county guideline structure)CA Courts Self-Help: temporary spousal support (guideline-formula practice description) (California Courts self-help) | $3,200.00 |
| Minus 50 percent of payee monthly net incomeCA Courts Self-Help: temporary spousal support (guideline-formula practice description) (California Courts self-help) | $1,500.00 |
| Temporary spousal support estimate, monthly (floor zero)CA Courts Self-Help: temporary spousal support (guideline-formula practice description) (California Courts self-help) | $1,700.00 |
Assumptions
- ESTIMATE ONLY: the 40/50 structure reflects the Santa Clara / Alameda county guidelines, which are local practice, not statute; other counties use variants. official-confirmation-required: pull the current county local rule before relying on this figure.
- Temporary (pendente lite) support only, computed AFTER child support. Courts may NOT use a guideline formula for long-term support; long-term awards weigh the Fam. Code 4320 factors.
- For instruments executed after 2018-12-31, spousal support is not deductible/taxable federally but remains deductible/taxable for CA state income tax; certified calculators adjust for this and this estimate does not.
- official-confirmation-required: the 40/50 temporary formula reflects Santa Clara and Alameda county guideline practice verified only via secondary sources; pull each county current local rule text before shipping county-specific numbers. Courts may not use a guideline formula for long-term support (In re Marriage of Schulze; pin cite also official-confirmation-required).
Estimate only. The court or state agency calculation controls.
California alimony under Cal. Fam. Code 4320 (long-term factors); county temporary-support guideline practice (no statewide statute for temporary formulas), effective 2019-01-01.
Not certified for court use: California Rules of Court, rule 5.275 allows only Judicial Council-certified software in court, and this tool is not certified. The 40/50 structure is county guideline practice, not statute, so confirm it against your county's current local rule before relying on any figure.
Temporary support has a practice formula; long-term support has factors
If you searched for a California alimony calculator, the state’s own word for it is spousal support, and the first question is which kind you mean. Temporary support, also called pendente lite support, keeps the household finances workable between separation and judgment. Long-term support, sometimes called permanent support, is what the judgment itself orders.
For temporary support, California courts routinely lean on guideline formulas built into their local practice and certified software. The best-known structure, used in Santa Clara and Alameda counties, is 40 percent of the paying spouse’s net monthly income minus 50 percent of the receiving spouse’s net monthly income, computed after any child support. Other counties run variants. Here is the honest catch: these formulas are local court practice, not state statute. We verified the 40/50 structure through secondary sources and the state courts’ own self-help description, and we flag every result with it as requiring official confirmation against the current local rule of the county that matters to you.
For long-term support the law flips. California case law bars courts from setting the judgment amount by formula. Instead, Family Code section 4320 lists the factors the judge must weigh: the marital standard of living, each spouse’s earning capacity, contributions to the other’s career, ability to pay, needs, assets and debts, the length of the marriage, employability against child care, age and health, documented domestic violence, tax consequences, hardship, and the goal that the supported spouse become self-supporting within a reasonable period, presumed to be half the length of a marriage under ten years. No calculator can weigh those for a court, and this one does not pretend to.
One tax wrinkle matters to both kinds. For instruments executed after 2018, spousal support is neither deductible by the payer nor taxable to the recipient for federal purposes, but California still treats it as deductible and taxable on the state return. The old county formulas were designed in the deductible era, so certified calculators adjust for the current tax treatment; this simple estimate does not.
- Temporary support practice
- 40% of payor net minus 50% of payee net, after child support (county guideline)source
- Legal status of that formula
- Local court practice, not statute; varies by county; confirmation requiredsource
- Long-term support
- No formula allowed; the court weighs the Fam. Code § 4320 factorssource
- Self-support goal
- Reasonable period, presumed half the length of a marriage under 10 yearssource
How to use this estimate
Enter each spouse’s net monthly income, after child support in the same case if there is any, because the county practice computes spousal support on what remains. With the default figures, 40 percent of $8,000 is $3,200, minus 50 percent of $3,000, which is $1,500, leaving a temporary support estimate of $1,700 a month. The result floors at zero; the formula never runs backward.
Use the number only for the temporary period, and hold it loosely even there. Your county may use a different variant, the judge may adjust it, and the current tax treatment shifts the after-tax effect of any given figure. Before relying on a number, check the local rules of your county superior court or ask its family law facilitator.
For long-term support, skip the arithmetic entirely. Read the section 4320 factor list on this page, gather the facts each factor asks about, and expect a judgment amount built from those, not from percentages.
What this estimate includes
- The 40/50 county temporary-support structure on the nets you enter, floored at zero
- Line-by-line math: the payor portion, the payee offset, and the result
- The official-confirmation-required flag on every result, stated in plain words
- The Fam. Code § 4320 factor list for the long-term conversation
What it leaves out
- Any long-term or post-judgment support number; California forbids formulas there
- County variants other than the 40/50 structure, and any county’s current local rule text
- Tax-treatment adjustments for post-2018 instruments, which certified tools apply
- Duration; temporary support runs on the court’s timetable, not a schedule
California spousal support FAQs
Is there an official California spousal support formula?
Not in statute. Temporary support formulas like the 40/50 structure come from county guideline practice and the software courts use, and they differ by county. Long-term support is the opposite of formulaic: the court must weigh the Family Code section 4320 factors, and case law bars using a guideline formula for the judgment amount.
What is the 40/50 formula this tool runs?
Take 40 percent of the paying spouse’s net monthly income, subtract 50 percent of the receiving spouse’s net monthly income, and floor the result at zero, computing after child support. It reflects Santa Clara and Alameda county guideline practice. We verified the structure through the state courts’ self-help materials and secondary sources, and we treat the current text of any county’s local rule as requiring official confirmation.
Why will this tool not estimate long-term spousal support?
Because any number would be invented. California courts may not set long-term support by formula; they must weigh the section 4320 factors, from the marital standard of living to earning capacity, health, documented domestic violence, and the balance of hardships. A calculator that prints a long-term figure for California is making it up, and this one refuses.
How long does spousal support last in California?
Temporary support lasts until the case resolves. For the judgment, there is no fixed schedule; the statute sets a goal that the supported spouse become self-supporting within a reasonable period, presumed to be half the length of the marriage for marriages under ten years. For longer marriages the court retains discretion, often with continuing jurisdiction rather than a set end date.
Does child support change the spousal support number?
Yes, in order of operations. The county temporary formulas run on incomes after child support is computed, so a large child support obligation shrinks the spousal support estimate. If both are in play, run the child support number first; our California child support page handles that side.
How did the 2019 federal tax change affect California support?
For instruments executed after December 31, 2018, spousal support stopped being federally deductible for the payer and taxable for the recipient. California did not conform, so the state return still deducts and taxes it. The county formulas were built in the deductible era, which is one more reason a certified calculator or the court’s own math can differ from this estimate.
Is this calculator certified for California court use?
No. California Rules of Court, rule 5.275 requires Judicial Council certification for support software used in court, and this tool is not certified. It exists so you can understand the temporary-support arithmetic and the long-term factor framework before you talk to the facilitator, a certified-software user, or a lawyer.
Good to know in California
- County matters more here than in most states: the 40/50 structure is Santa Clara and Alameda practice, and other counties have historically used variants such as 35/40. Check your county superior court local rules for the version that applies.
- Domestic violence carries specific statutory weight: section 4320 requires considering documented abuse, and a criminal conviction for domestic violence triggers a rebuttable presumption against awarding support to the abusive spouse under section 4325.
Official sources
Official sources last verified: .
- CA Courts Self-Help: temporary spousal support (guideline-formula practice description)
California Courts self-help Last checked
- Cal. Fam. Code 4320 (long-term spousal support factors)
California Legislature (leginfo) Last checked
- Cal. Rules of Court, rule 5.275 (support software certification standards)
Judicial Council of California Last checked
Reviewed by SupportDecode Editorial Team Page content reviewed Sources Methodology Update log
Changelog: page first published with the county 40/50 temporary structure in estimate mode and the section 4320 factor framework. Material changes are dated in the update log.