Sources and scope: the legal statements below were compared with the linked California statutes, court rules, and court or agency material. This is general legal information, not advice about a specific case.
Temporary support covers the case; long-term support is part of the judgment
Family Code §3600 allows a judge to order support that is necessary while a qualifying family case is pending, subject to domestic-violence rules. Many courts use a local guideline to arrive at an interim amount without trying the entire case.
Support in or after the judgment is decided under §4320. The judge considers the full statutory record, so a temporary order neither sets the final amount nor replaces the findings required for longer-term support.
| Issue | Temporary support | Long-term support |
|---|---|---|
| When decided | While the case is pending | In the judgment or afterward |
| How calculated | The court may use a local guideline or another interim method | No statewide formula; all applicable §4320 factors |
| Financial focus | Often tax-adjusted monthly net income after child support | Earning capacity, needs, ability to pay, property, debt, and the marital standard of living |
| How long it lasts | Until changed, replaced, terminated, or the case ends | Controlled by the judgment, agreement, retained jurisdiction, and statutes |
The common 40%-minus-50% calculation is only an interim guide
California Courts gives 40% of the higher earner's net monthly income minus 50% of the lower earner's net as a common way judges estimate temporary support. A court can use a different method, and need and ability to pay still matter. Gross salary is not the input.
Santa Clara's Rule 3.C generally uses that formula after adjusting for taxes and for income allocated to child support and child-related expenses. Los Angeles Rule 5.10 allows its judges to use the Santa Clara guideline. Orange County does not publish a fixed percentage, and San Diego's 2026 rules do not state one countywide formula.
| Step | Example |
|---|---|
| Higher earner's net monthly income | $8,000 × 40% = $3,200 |
| Lower earner's net monthly income | $3,000 × 50% = $1,500 |
| Difference | $3,200 − $1,500 = $1,700 a month |
| What it means | An interim estimate; child support, taxes, need, local rules, and judicial discretion can change it |
For support at judgment, the court must work through §4320
The judge compares each spouse's earning capacity with the marital standard of living. That includes marketable skills, the job market, time and cost for education or training, and earning capacity lost while a spouse performed domestic duties. Contributions to the other spouse's education, training, career, or license also matter.
The rest of the analysis includes ability to pay; needs measured against the marital standard; assets and debts, including separate property; marriage duration; dependent children; age and health; documented domestic violence; tax consequences; hardships; the goal of self-support; specified criminal convictions; and any other factor the court finds just and equitable.
- Income history, bonuses, commissions, business cash flow, benefits, and evidence of earning capacity
- Education, credentials, work history, job-market evidence, and the time and cost of retraining
- A marital-standard-of-living budget tied to records from the marriage
- Property, debt, liquidity, retirement resources, and housing needs after division
- Health limitations, insurance, care of dependent children, and other barriers to work
- Domestic-violence evidence, taxes, relative hardships, and other equitable circumstances
Marriage length affects duration and jurisdiction, not entitlement by itself
For a marriage not treated as long duration, §4320 generally describes one-half the length of the marriage as a reasonable period for the supported spouse to become self-supporting. The judge can choose a shorter or longer period after considering the other factors. Duration is generally measured from marriage to separation.
Section 4336 creates a rebuttable presumption that a marriage lasting 10 years or more is long duration and ordinarily preserves jurisdiction unless the spouses agree otherwise or the court terminates support. It does not guarantee an award, set an amount, or create 'lifetime alimony.' A shorter marriage can also be found long duration in the right circumstances.
| Marriage duration | What the statute supports | What it does not promise |
|---|---|---|
| Under 10 years | A general self-support reference of about half the marriage, subject to discretion | A fixed end date or automatic award |
| 10 years or more | A rebuttable long-duration presumption and ordinarily retained jurisdiction | Lifetime payments or a particular amount |
| Under 10 years but found long duration | The court may reach this conclusion from the circumstances | An automatic result from a calculator |
The judgment determines whether support can change later
Whether support can be modified depends on the judgment or agreement, retained jurisdiction, the governing statute, and changed circumstances. A carefully written agreement can make support nonmodifiable or limit jurisdiction. Until a change is made enforceable, the person ordered to pay should not simply reduce or stop payments.
Under §4337, the obligation ordinarily ends when either party dies or the supported spouse remarries, unless a written agreement says otherwise. Cohabitation is different: §4323 creates a rebuttable presumption of reduced need but does not automatically terminate support. That section also generally excludes the income of the supporting spouse's new spouse or partner.
New California instruments follow federal alimony tax treatment from 2026
For a California divorce or separation instrument executed on or after January 1, 2026, the payor generally cannot deduct support on a California return and the recipient generally does not include it as California income. That matches the federal treatment that ordinarily applies to instruments executed after 2018.
An instrument executed before 2026 generally keeps the earlier California treatment unless a later modification expressly adopts the new rule. The original date, modification language, residence, filing status, and federal treatment all matter. Do not assume a deduction, inclusion, or tax gross-up without checking the actual instrument and current tax law.
Match the request to the evidence the judge must consider
1. Say which order you need
Keep temporary support during the case separate from the amount and jurisdiction requested in the judgment.
2. Prove the income
Gather tax returns, pay records, bonus and stock information, business books, benefits, and evidence about disputed or recurring income.
3. Calculate child support first
When the local temporary method requires it, use tax-adjusted net income left after child support and child-related expenses.
4. Address every §4320 factor
Tie evidence to the marital standard, need, ability to pay, earning capacity, property, health, child care, violence, taxes, hardships, and self-support.
5. Write terms that can be enforced
Cover amount, start and due dates, withholding, duration, jurisdiction, review, modification, arrears, security, and termination.
6. Check the county and tax date
Use the assigned court's temporary-support procedure and the tax law tied to the instrument's execution and modification dates.
Questions readers often ask
Frequently asked questions
Does California have a statewide alimony formula?
Not for support at judgment. The court must consider every applicable §4320 factor. A county may use or reference a formula for temporary support while the case is pending.
What is the common temporary-support formula?
California Courts describes 40% of the higher earner's net monthly income minus 50% of the lower earner's net as a common estimate. A county may use another method, and the figure does not control final support.
Does a 10-year marriage guarantee lifetime support?
No. Ten years creates a rebuttable long-duration presumption for retained jurisdiction. It guarantees neither an award nor an amount or payment period.
How long does support last after a marriage under 10 years?
If the marriage is not treated as long duration, §4320 generally uses half the marriage length as a self-support reference. The judge can order a shorter or longer period after considering all the facts.
Does cohabitation automatically stop support?
No. It creates a rebuttable presumption of decreased need under §4323. Remarriage, by contrast, ordinarily ends support under §4337 unless a written agreement says otherwise.
Is California spousal support taxable in 2026?
For an instrument executed on or after January 1, 2026, the payor generally receives no California deduction and the recipient generally excludes the payment from California income. Older instruments can keep the prior treatment unless a later modification expressly adopts the new rule.
Sources used for this guide
Official sources
- California Courts — Temporary spousal support
Describes 40% of the higher earner's net minus 50% of the lower earner's net as a common temporary estimate and warns that a court may use another method.
- California Courts — Long-term spousal support
Explains the §4320 analysis used for support at judgment, evidence to gather, duration, and modification.
- California Family Code §3600 — Temporary support
Authorizes support that is necessary while a qualifying family-law case is pending.
- California Family Code §4320 — Long-term support factors
Lists the earning-capacity, need, ability-to-pay, property, duration, health, domestic-violence, tax, hardship, and equitable factors for support at judgment.
- California Family Code §4323 — Cohabitation
Creates a rebuttable presumption of reduced need when the supported spouse cohabits and generally excludes the supporting spouse's new partner income.
- California Family Code §4336 — Long-duration marriage
Creates a rebuttable long-duration presumption at 10 years and provides for retained jurisdiction without guaranteeing lifetime support.
- California Family Code §4337 — Termination
Ends the obligation at either party's death or the supported spouse's remarriage unless a written agreement provides otherwise.
- California Courts — Taxes and spousal support
Explains California's January 1, 2026 alimony tax change and how earlier orders and agreements are treated.
- Santa Clara Superior Court — Family Rules
Santa Clara Rule 3.C generally uses 40% of payor net minus 50% of payee net for temporary support, adjusted for taxes and income allocated to child support and child expenses.
- Los Angeles Superior Court — Family Law Local Rules
Los Angeles Rule 5.10 allows the court to use Santa Clara County's temporary-support guideline.