§3600 temporary spousal support: what the statute says, and what every county actually does

California has two completely different statutory regimes for spousal support, and conflating them is one of the most common — and most consequential — errors in pendente-lite practice. The first regime, Family Code §3600, governs temporary spousal support during the pendency of the dissolution. The second, Family Code §4320, governs permanent (post-judgment) support. They look related. They are not the same statute, they do not produce the same number, and they are computed by entirely different methods.

This post walks through §3600 specifically. What the statute authorizes; what discretion the court has; how local guideline formulas (the “Santa Clara formula” and its Alameda / Marin variants) actually do the math; what Schulze held about using a temporary-support guideline for permanent support; and where the practitioner bench tools — XSpouse, Family Law Software, and the calculator we built — fit into the workflow.

If you are coming to this post because the §3600 number on your court order doesn’t match your DissoMaster printout, the temporary/permanent confusion is almost certainly the cause. The fix is structural, not arithmetic.

What §3600 actually says

§3600 reads, verbatim (from the current text at leginfo.legislature.ca.gov):

During the pendency of any proceeding for dissolution of marriage or for legal separation of the parties or under Division 8 (commencing with Section 3000) (custody of children) or in any proceeding where there is at issue the support of a minor child or a child for whom support is authorized under Section 3901 or 3910, the court may order (a) either spouse to pay any amount that is necessary for the support of the other spouse, consistent with the requirements of subdivisions (i) and (m) of Section 4320 and Section 4325, or (b) either or both parents to pay any amount necessary for the support of the child, as the case may be.

The statute was last amended by Stats. 2014, Ch. 82, Sec. 35 (SB 1306), effective January 1, 2015. It has not been substantively amended since.

Several things are worth noticing in that single sentence:

1. “During the pendency” — §3600 is a pendente lite statute. It runs only while the dissolution or separation case is pending, from filing through judgment. It is not the authority for post-judgment support.
2. “Any amount that is necessary” — the statute is permissive (“the court may order”). There is no statutory formula, no income table, no multiplier. The court’s discretion is bounded only by what the court determines is “necessary.”
3. “Consistent with the requirements of subdivisions (i) and (m) of Section 4320 and Section 4325” — only two of the §4320 factors are imported into the §3600 analysis: §4320(i) (documented history of domestic violence) and §4320(m) (criminal abuse convictions). The other twelve §4320 factors — earning capacity, marital standard of living, ability to pay, duration of marriage, age and health, tax consequences, hardship, self-support goal, “any other just and equitable factors” — are not applicable to temporary support. §4325 is the abuse-perpetrator presumption against support.

That last point is the structural surprise. Most non-attorneys (and a meaningful number of attorneys) assume §3600 temporary support requires the court to consider the full §4320 factor list. It doesn’t. §3600 imports only the abuse-and-violence factors. The rest of the §4320 inquiry is reserved for the permanent-support analysis at judgment.

How counties actually do the math: the “Santa Clara formula”

Because §3600 contains no formula, California family courts have developed local guideline formulas to estimate temporary spousal support. The most-cited one is the “Santa Clara formula” — universally attributed to Santa Clara County. Its operative rule is straightforward:

• When there is no child support order: temporary spousal support is 40% of the payor’s net monthly income minus 50% of the payee’s net monthly income.
• When there is also a child support order: the formula is modified to net out the child support flow before applying spousal percentages — the exact mechanics vary by county.

These local formulas are not statutory. They have no §3600 status. They are presumptive starting points that the trial court may adopt or depart from in its discretion under §3600’s “any amount that is necessary” mandate. Schulze explicitly acknowledges this — it describes the guideline as a “rough estimate” of temporary support and frames departure as a normal exercise of discretion.

The cleanest published local rule incorporating the formula is Alameda County Superior Court Local Rule 5.70:

The following discretionary guideline is adopted for temporary spousal support or partner support in marital and domestic partnership dissolution cases.

(a) Non-child support cases — In cases where there is no child support, the guideline spousal or partner support is 40% of the net income of the payor minus 50% of the net income of the payee.

(b) Child support cases — In cases where there is to be child support, the guideline spousal or partner support uses the components set forth in Family Code sections 4055 through 4069 in the following formula…

(Rule 5.70 was adopted as Rule 11.2 effective May 19, 1998, amended and renumbered effective January 1, 2008. The current published rule is in force as of July 1, 2025.)

Marin County Uniform Local Rule 7.14 publishes a different formula:

• No child support: 40% payor / 50% payee — same as Alameda.
• With child support: 35% of payor’s net (after CS) minus 45% of payee’s net (without addition of CS) — distinct from the Alameda Rule 5.70 §4055-tied mechanics.

(Marin’s current rules PDF is in force as of July 1, 2025.)

Santa Cruz County Local Rule 3.2.01 simply imports Alameda’s formula by reference:

The Court’s temporary spousal support guideline is based on the current Alameda County guidelines using the Dissomaster XSpouse program.

The honest disclosure: despite the universal attribution of “the Santa Clara formula” to Santa Clara County, a verbatim numbered local rule analogous to Alameda Rule 5.70 from the Santa Clara Superior Court was not readily retrievable from primary sources at the time of writing. The formula’s substance is what every practitioner means by “Santa Clara”; the cleanest primary-source citation for the 40/50 mechanics is Alameda Rule 5.70, not a Santa Clara rule.

The temporary / permanent distinction — and why Schulze matters

In re Marriage of Schulze (1997) 60 Cal.App.4th 519 is the case practitioners reach for when the question is whether a temporary-support guideline can do double duty for permanent support. The answer is no. Verbatim from Schulze:

In light of the different legal purposes for each kind of support order and the reality that temporary support will tend to be higher than permanent support, In re Marriage of Olson, supra, 14 Cal.App.4th 1, specifically warned against using temporary spousal support guidelines in a computer program assigned the task of determining permanent support.

And:

Section 4320 clearly contemplates a ground-up examination of the need for and appropriate level of permanent spousal support, rather than beginning with a figure pegged to a proposed temporary support order.

The load-bearing point: a permanent-support order computed by running the §3600 temporary formula and calling it permanent is reversible error. The court has to do a separate §4320-factor analysis, not just relabel the temporary figure. Practitioners who carry the temporary number forward as a settlement anchor without acknowledging this distinction routinely give away leverage — or take on liability.

Why does temporary support tend to be higher? Because the temporary regime is preserving the status quo during a stressful period when the marital estate is paying for two households. The permanent regime under §4320 contemplates the recipient transitioning toward self-support (factor (l) — “the goal that the supported party shall be self-supporting within a reasonable period of time”), the ability-to-pay analysis at factor (e), and several others that pull the permanent figure downward relative to a §3600-style “needs of the moment” computation.

Because no calculator can responsibly compute permanent spousal support — that’s the Schulze prohibition — our calculator computes only temporary support, with the §4320 fourteen-factor list rendered as a checklist on the result page for downstream practitioner work. We have written separately about the DissoMaster sunset and the post-2025 practitioner landscape — for any case headed toward judgment, the §4320 ground-up analysis lives entirely outside the temporary-spousal calculator.

A worked example

Sanitized fact pattern. Both spouses are W-2 employees. No child support order in place (the dissolution is between spouses with no minor children).

• Payor spouse: $9,000/month net disposable income.
• Payee spouse: $3,000/month net disposable income.

Alameda Rule 5.70(a) / Santa Clara formula, no-child-support case:

Temporary spousal support = 40% × payor’s net − 50% × payee’s net = 40% × $9,000 − 50% × $3,000 = $3,600 − $1,500 = $2,100/month

That is the guideline figure the trial court would treat as its presumptive starting point under §3600. The court remains free to depart on a showing of good cause — and §3600’s “any amount that is necessary” mandate gives the court substantial latitude to do so. But absent a specific reason to depart, $2,100/month is the answer.

What changes the answer:

• A documented history of domestic violence (§4320(i)) — the court may reduce or deny the payee’s temporary support if the payee was the perpetrator, or increase it if the payor was. Imported into §3600 explicitly.
• A criminal conviction for abuse (§4320(m)) — same analysis, stronger statutory hook via §4325’s presumption against awarding support to a convicted abuser.
• A meaningful disparity between actual cash flow and the W-2 NDI figures — when one spouse has significant non-W-2 income that the W-2 number doesn’t capture, the temporary court can look behind the W-2 figures. The §4320 earning-capacity analysis under factor (a) does not import, but §3600’s “any amount necessary” language is broad enough to let the court adjust.
• The presence of child support in the same order — the formula changes (Alameda 5.70(b) ties into §4055; Marin 7.14 uses 35/45). The combined-order math is where the local-rule variation matters most.

A note on tax treatment

One structural change since the 2017 federal Tax Cuts and Jobs Act significantly affects §3600 temporary spousal support, and it is worth flagging because it surfaces in nearly every post-2018 case. For divorce or separation instruments executed after December 31, 2018, spousal support is no longer deductible by the payor and no longer includible in income by the payee for federal tax purposes. California, by contrast, continued to follow the pre-TCJA rule — spousal support remains deductible by the payor and taxable to the payee for California state tax purposes.

The practical consequence: pre-TCJA spousal support orders used to be “above-the-line” deductible on the payor’s federal return, which made the after-tax cost of paying spousal support roughly proportional to the payor’s combined federal-and-state marginal rate. Post-TCJA, the federal subsidy is gone — the payor pays spousal support out of after-federal-tax dollars — while California continues to offer the partial state-level deduction.

That shift made the 40/50 (or county-variant) guideline formula meaningfully more expensive for the payor in after-tax terms, and meaningfully less attractive for the payee in after-tax terms, than the same guideline figure produced pre-TCJA. Trial courts have adjusted by being somewhat more willing to depart from the guideline starting point under §3600’s “any amount necessary” mandate, but the formula itself was not amended — practitioners run it pre-tax and rely on the court’s discretion to handle the federal-tax-mismatch problem case by case.

What this post is not

This is an engineering walk-through of §3600’s statutory authority, the local guideline formulas California family courts use to estimate temporary spousal support, and the Schulze prohibition on using those formulas to compute permanent support. It is not legal advice. §3600 motions implicate domestic-violence findings under §4320(i) and §4325, tax allocation under federal post-TCJA rules, and substantive judgment about what is “necessary” in the specific case — all of which benefit from a licensed California family-law attorney’s input. If your dissolution involves any of the above, attorney consultation before the §3600 motion is genuinely load-bearing.

Two related pieces worth reading alongside this one: our piece on the DissoMaster sunset (because the bench-tool replacement question matters for §3600 practice just as much as for §4055 practice), and our §4058 self-employment math walk-through (because the “net monthly income” inputs to the §3600 formula are §4059 NDI figures — and they are computed the same way regardless of whether the case ends up on the §3600 temporary side or the §4320 permanent side).

The statute text quoted above was current as of the statute_as_of date in this post’s frontmatter; we re-verify all citations quarterly. The page footer’s disclaimer applies to every section above.