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Last Modified on Nov 15, 2026
California spousal support hub / Amount and income
By H. William Edgar, California family law attorney at Edgar & Dow.
California does not require every paying spouse to devote a fixed percentage of income to alimony. Percentages appear in some temporary-support guidelines and in orders addressing bonuses or other variable compensation. Those uses do not create a statewide percentage for all support orders.
Before relying on a percentage, identify what it measures, which income it applies to, and whether it concerns temporary or long-term support. “Forty percent of income” is incomplete advice and can produce a seriously misleading estimate.
Where the familiar 40% figure comes from
The California Courts’ temporary-support guidance describes a commonly used starting formula that takes 40% of the higher earner’s net monthly income and subtracts 50% of the lower earner’s net monthly income. The guidance also explains that a court may use a different method and may vary the result based on the circumstances.
That formula is not the same as ordering the higher earner to pay 40% of gross salary. It accounts for the other spouse’s income, uses a net-income concept, and applies in a particular temporary-support setting. Child support and local calculation practices can further affect the analysis.
For illustration only, if the relevant net-income inputs were $8,000 and $3,000, that particular formula would produce $3,200 minus $1,500, or $1,700. The arithmetic explains the formula; it does not establish an award. Whether those inputs are correct, whether that method applies, and whether an adjustment is appropriate remain separate questions.
Temporary guidelines assist the court; they do not replace judgment
Family Code section 3600 supplies the statutory authority for necessary temporary support while the case is pending, subject to the specified domestic-violence provisions. Courts use guidelines to help evaluate financial need and ability to pay. The guideline does not eliminate the need for accurate evidence.
A support calculation can be wrong even when the arithmetic is flawless. Common problems include using gross wages as net income, overlooking the requesting spouse’s earnings, treating voluntary withholding as a required tax expense, or applying an outdated tax assumption. The resulting percentage of actual take-home pay may differ substantially from what someone expected.
When reviewing a printout, ask for the underlying inputs and identify the local approach used. A screenshot displaying only the final number is not enough to evaluate the calculation. Our calculator article explains how to use estimates without mistaking them for court orders.
Long-term support has no universal percentage formula
At judgment, the court must evaluate section 4320. Among other matters, that statute addresses earning capacity, domestic contributions, ability to pay, needs measured against the marital standard of living, assets and obligations, marriage length, age and health, tax consequences, and relative hardships.
In In re Marriage of Zywiciel (2000) 83 Cal.App.4th 1078, the court rejected the use of a temporary guideline result as a substitute for the required permanent-support analysis. A proposed long-term amount needs an independent explanation grounded in the evidence and statutory factors.
This does not make mathematics irrelevant. Budgets, income comparisons, tax estimates, and cash-flow projections are useful. They organize evidence. The error is treating one percentage as the governing legal rule when the court must exercise judgment across several factors.
A bonus percentage serves a different purpose
An order may require base monthly support plus a percentage of specified additional compensation. The approach is commonly associated with In re Marriage of Ostler & Smith (1990) 223 Cal.App.3d 33, which upheld an additional support provision based on future bonuses in the circumstances before the court.
The percentage in that order did not establish a mandatory rate for other divorces. Such provisions address uncertainty: additional support becomes due when defined additional income is received. The base amount, percentage, income definition, and other terms must fit the case.
Suppose a hypothetical agreement requires $2,000 monthly support plus 15% of a defined bonus. A $20,000 qualifying bonus would create a $3,000 additional payment under that assumed language. The example illustrates administration of the agreed percentage; it is not a recommended percentage or a prediction of an award.
The definition of income matters as much as the rate
An order applying a percentage to “bonus income” should explain whether it covers commissions, deferred compensation, equity awards, incentive-plan payments, or other compensation. A dispute may turn on the words chosen rather than the parties’ recollection of what they intended.
The order should also explain whether the percentage applies to gross or net additional income, how any threshold works, and whether compensation already included in base support is excluded. Without those details, the same earnings can be counted twice or an important form of compensation can be left unaddressed.
Business income presents additional issues. Applying a percentage to gross receipts without addressing reasonable business expenses can produce a distorted result. A business owner’s control over distributions or compensation may require document-exchange and verification terms. Our variable-income guide develops those issues.
An uncapped percentage can create a different dispute
A percentage that appears modest at ordinary earnings levels can produce a very large payment after an extraordinary compensation event. The court still must consider the relevant support factors. A percentage order does not free the award from the legal framework governing spousal support.
In re Marriage of Kerr (1999) 77 Cal.App.4th 87 illustrates the problem. The court addressed additional support tied to stock-option income and required attention to a maximum amount in light of the exceptional appreciation and the marital standard of living. Its holding should not be reduced to a rule that every percentage order must contain the same cap.
For settlement, test the proposed language against realistic high and low scenarios. Consider whether a cap, review provision, or a more precise definition is appropriate. The goal is an order that both parties can understand and administer when income changes.
Compare the actual obligation, not competing slogans
When someone proposes a percentage, ask four practical questions: a percentage of what, for which period, in addition to what other payments, and under which legal framework? Those questions reveal whether the discussion concerns a temporary estimate, a bonus clause, or a negotiated final arrangement.
Also compare the after-tax cost and benefit using the governing instrument’s actual treatment. California’s 2026 changes do not automatically place every older order under the new rules. A percentage of gross additional income may have a different economic effect under different tax regimes.
The reliable answer is therefore case-specific. A percentage may be a useful component of a calculation or agreement, but it cannot replace the evidence, the statutory analysis, or clear drafting. Review the complete proposed obligation before deciding whether the amount is workable.
Discuss your spousal support case with Edgar & Dow
A useful consultation starts with the existing orders, current financial records, and the decision that needs to be made. Edgar & Dow represents clients in California family law matters. Contact our office or call 951-684-6885 to discuss your situation.
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