How Much Alimony in California: Amounts, Duration, and Changes

There is no single dollar figure or fixed formula that answers how much alimony in California a spouse will pay or receive. While the divorce is pending, courts use a county guideline calculation that produces a specific temporary number from each spouse’s income. Once the divorce is final, long-term support is set by a judge weighing more than a dozen factors in Family Code Section 4320, with the length of the marriage doing more than any other factor to shape how long payments last.

Temporary Support: The Closest Thing to a Formula

Temporary support, ordered while the case is pending, is the one place California courts use something close to a formula. Judges in most counties run the numbers through specialized software (DissoMaster is the most common) that applies a county guideline. A widely used version takes roughly 40 percent of the higher earner’s net monthly income and subtracts roughly 50 percent of the lower earner’s net monthly income. The difference is the guideline amount. Exact percentages vary by county.¹

Both spouses have to file an Income and Expense Declaration (Form FL-150) so the court can see actual earnings, investments, monthly expenses, and debts before it runs any calculation.²

The guideline number is a starting point, not a mandate. A judge can move the amount up or down based on the supported spouse’s actual needs and the paying spouse’s ability to cover them. Unusually high medical costs on one side, or significant bonuses that the formula captures poorly on the other, give the court room to adjust.³

Long-Term Support: Why There Is No Formula

Once the divorce is finalized, the guideline calculation goes away. Long-term support is set by the judge after weighing the factors in Family Code Section 4320, balancing the supported spouse’s needs against the paying spouse’s ability to provide.⁴ The most consequential factors include:

Each spouse’s earning capacity given their skills, education, and the local job market.
Career sacrifices the supported spouse made during the marriage, such as leaving the workforce or reducing hours for household responsibilities, and how those sacrifices affect current earning ability.
Contributions one spouse made to the other’s education or professional training.
The paying spouse’s income, assets, and standard of living.
The marital standard of living, which serves as a benchmark for what the supported spouse should reasonably expect going forward.
Each spouse’s separate property, shared debts, and how community property was divided.
The length of the marriage.
Age and health of each spouse.
Any documented history of domestic violence.
Whether the supported spouse has custody of young children and cannot work full-time as a result.
The immediate tax consequences to each spouse.
The overall balance of hardships.

No single factor controls. Two cases with nearly identical incomes can produce very different orders. A spouse who left a lucrative career to raise children for fifteen years will be treated differently than one who chose part-time work during a five-year marriage.⁴

How Long Support Lasts

The length of the marriage is the biggest driver of duration, and California draws a meaningful line at ten years.

Marriages Under Ten Years

For marriages shorter than ten years, the general expectation is that support will last about half the length of the marriage. A six-year marriage produces a support obligation of roughly three years. Section 4320 defines a “reasonable period of time” for the supported spouse to become self-sufficient as one-half the length of the marriage.⁴

The half-length rule is guidance, not a ceiling. A judge can order a shorter or longer period based on the other Section 4320 factors. A serious disability, for example, might justify support well beyond half the marriage length.

Marriages of Ten Years or More

California presumes that a marriage lasting ten years or more, measured from the wedding date to the date of separation, is a “marriage of long duration.” For these marriages, the court does not set an automatic end date. It retains jurisdiction indefinitely, meaning support can continue as long as the supported spouse needs it and the paying spouse can afford it.⁵

Indefinite is not the same as forever. The paying spouse can always petition later for a reduction or termination based on changed circumstances. The court can also find that a marriage under ten years qualifies as long duration in unusual cases, or that one over ten years does not, if significant separations occurred during the marriage.⁵

Regardless of marriage length, support automatically ends when either spouse dies or when the supported spouse remarries, unless the parties agreed otherwise in writing.⁶

When Earning Capacity Gets Tested

If the spouses disagree about what the supported spouse could earn with reasonable effort, either side can ask the court to order a vocational evaluation. A licensed vocational counselor interviews the spouse, reviews education and work history, administers career-aptitude assessments, and surveys the local job market to determine realistic earning potential.⁷

The evaluation carries real weight on the dollar amount. If a counselor concludes that a supported spouse could earn $55,000 per year with existing skills, the court can set support based on that earning capacity even if the spouse is currently unemployed. If the evaluation shows the spouse needs two years of retraining before becoming employable, that timeline shapes both amount and duration. The court can order the paying spouse to cover the cost of the evaluation and any recommended training.⁷

The Gavron Warning

When ordering long-term support, a judge may issue a Gavron Warning. This is formal notice to the supported spouse that they are expected to make reasonable efforts toward becoming self-supporting. The warning does not change the current amount or set a hard deadline, but it has teeth. If the supported spouse later makes no meaningful effort to find work, go back to school, or build employable skills, the paying spouse can return to court and ask for a reduction or termination based on that failure.⁸

Reasonable effort depends on the situation. A 50-year-old who has not worked in twenty years will not be expected to land a six-figure job within a year. Doing nothing at all, though, is what the warning targets. Courts look for genuine steps: enrolling in courses, updating certifications, actively applying for jobs, or building a small business. For marriages of long duration, the court can skip the warning entirely if circumstances make it inappropriate, such as when a supported spouse has a disability that prevents employment.⁸

Changing the Amount Later

A spousal support order is not locked in. Either spouse can ask the court to modify the amount or duration, but only if something significant has changed since the last order. The judge applies the same Section 4320 factors again, and the spouse requesting the change must explain how each relevant factor now looks different.⁹

One timing rule matters: if the court grants a modification, the new amount can only be backdated to the date the request was filed. Every month of delay in filing is a month stuck with the old order.⁹

If the parties agreed in writing that support is not subject to modification, the court cannot change it later. That kind of provision most often appears in negotiated settlement agreements.¹⁰

Cohabitation With a New Partner

If the supported spouse moves in with a romantic partner, California law creates a rebuttable presumption that their need for support has decreased. The paying spouse does not have to prove the new partner is actually contributing financially, only that the two are living together. The supported spouse can try to rebut the presumption by showing that expenses have not decreased, but the burden shifts. The couple does not need to present themselves as married for the rule to apply.¹¹

The rule does not work in reverse. If the paying spouse gets a new partner, that partner’s income cannot be considered when setting or modifying the support amount.¹¹

Retirement

Reaching retirement age does not automatically end a support obligation, but it can justify a modification. A paying spouse who retires at a conventional age (generally around 65, though some professions have earlier norms) can petition to reduce or terminate support based on reduced post-retirement income. The court looks at the retiree’s full financial picture, including pension, Social Security, 401(k) distributions, and investment income, alongside the supported spouse’s needs and resources.

The key question is whether the retirement was reasonable. A spouse who retires at 65 after a full career gets a sympathetic hearing. Early retirement at 52, especially if the timing looks calculated to shed support, may not persuade the court. Until a modification is granted, the paying spouse must keep making payments at the current level.

Prenuptial Agreements

A prenuptial agreement can modify or waive spousal support, but California imposes strict conditions. A provision limiting or eliminating support is unenforceable unless the spouse giving up the right had their own independent attorney at the time of signing. Even with independent counsel, the court can still refuse to enforce the provision if it would be unconscionable at the time one spouse tries to use it, meaning the result would be so one-sided as to shock the conscience given each spouse’s circumstances at divorce. Having a lawyer at signing does not automatically save the clause; the statute specifies that an otherwise unenforceable waiver cannot become enforceable solely because the affected spouse had counsel.¹²

Taxes Change the Net Amount

The dollar figure the court orders is not necessarily what ends up in either spouse’s pocket, because tax treatment matters. Federal law changed with the Tax Cuts and Jobs Act: for any divorce or separation agreement executed after 2018, the paying spouse cannot deduct support payments, and the receiving spouse does not report them as income.¹³

California’s state rules diverged for years. Through 2025, California still allowed the payer to deduct spousal support on state returns and required the recipient to report it as state income, regardless of the federal change. That ended on January 1, 2026, when California aligned with federal law. For any order or agreement made on or after that date, spousal support is neither deductible by the payer nor reportable as income by the recipient on California state returns.¹⁴

If your order was made before January 1, 2026, the old California rules still apply, meaning the payer can still deduct and the recipient still reports the payments on state taxes. If that older order gets modified after 2025, the original tax treatment carries over unless the new order explicitly states that the 2026 rules should apply.¹⁴

1
California Courts. Temporary Spousal Support
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California Courts. Income and Expense Declaration (FL-150)
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California Courts. Ask for Temporary Spousal Support
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California Legislative Information. California Family Code FAM 4320
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California Legislative Information. California Family Code FAM 4336
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California Legislative Information. California Family Code FAM 4337
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California Legislative Information. California Family Code FAM 4331
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California Legislative Information. California Family Code FAM 4330
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California Courts. Ask to Change Your Long-term Spousal Support Order
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California Legislative Information. California Family Code FAM 3651
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California Legislative Information. California Family Code FAM 4323
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California Legislative Information. California Family Code FAM 1612
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IRS. Topic No. 452, Alimony and Separate Maintenance
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California Courts. Taxes and Spousal Support