How To Calculate Alimony in California

Start by separating temporary and long-term alimony

To calculate alimony in California, first identify whether you need a temporary-support illustration or an assessment of long-term support. Temporary spousal support may use a local guideline calculation. Long-term support requires a review of the parties’ circumstances, not simply two income figures.

The calculator above illustrates the common 40% of the higher earner’s net monthly income minus 50% of the lower earner’s net monthly income method. It is a budgeting starting point for 2026, not a statewide entitlement formula or a prediction of your court order.

Enter monthly income, not annual salary

Select Temporary illustration — no child support. Enter both spouses’ net monthly incomes in the correctly labeled fields. Enter zero when a spouse has no income; do not leave the field blank.

Net income for support purposes may differ from the amount deposited into a bank account. Taxes, permitted deductions, additional income and the applicable calculation method need review. This tool does not decide which deductions a court will allow or convert gross pay into court-ready net income.

Keep the periods consistent. For a stable weekly net amount, multiplying by 52 and dividing by 12 gives a monthly average. For biweekly pay, use 26 payments annually rather than assuming two payments every month.

If you want the related standalone tool, the California Spousal Alimony Calculator also provides a common temporary-support base estimate. Neither tool determines duration or replaces a case-specific calculation.

Choosing long-term support or the child-support/other option produces an explanatory message instead of an amount. The calculator also rejects reversed income entries. Editing an input hides the old result; Reset clears the form.

A complete temporary-support example

Assume no child support is involved and use these inputs:

• Calculation scope: Temporary illustration — no child support
• Higher earner’s net monthly income: $6,500
• Lower earner’s net monthly income: $2,200

Higher-income component:

$6,500 × 40% = $2,600

Lower-income offset:

$2,200 × 50% = $1,100

Illustrative monthly temporary support:

$2,600 − $1,100 = $1,500

The calculator displays those two components and the $1,500 result. It rounds each percentage component to cents before subtracting. If the subtraction is negative, the displayed estimate is zero, not a payment in the opposite direction.

Changing the lower income to $5,500 would produce $2,600 minus $2,750, so the illustration becomes $0. That does not establish that a judge must deny support; it only describes this formula’s output.

For personal expense planning, the tools on California Calculator can help with separate budget calculations. Do not spend an estimated support amount as though it has already been ordered or received.

Why children can change the calculation

Child support and spousal support are different obligations, but calculating them together can affect the financial picture. Custody arrangements, support obligations and permitted adjustments cannot be represented by casually subtracting a child-support payment from one income field.

The guide on How Child Support Works in California explains the separate child-support topic. If child support applies, use an appropriate combined calculation with court guidance rather than relying on this simplified illustration.

Long-term support: what the formula leaves out

Often called permanent alimony, long-term support is not automatically lifelong. Family Code section 4320 requires consideration of earning capacity, ability to pay, needs connected with the marital standard of living, assets, obligations, marriage length, age, health and other circumstances.

Contributions to a spouse’s education or career, effects of caring for children, documented domestic violence, tax consequences and the balance of hardships can also matter. Either spouse may be ordered to pay; the calculation is not based on gender.

You can find the Family Code through the California Legislature. Sections 4320, 4323, 4336 and 4337 address factors, cohabitation, long-duration marriages and termination respectively.

The often-mentioned half-the-marriage period is generally a self-support goal for marriages not treated as long-duration marriages, not a guaranteed payment schedule. Courts retain discretion. Ten years generally creates a presumption of long duration for retained jurisdiction; it does not guarantee lifetime payments.

Tax treatment matters in 2026

For California instruments executed on or after January 1, 2026, qualifying alimony is generally neither deductible by the payer nor included in the recipient’s income. Certain older instruments modified to expressly adopt the new rules also qualify. Older arrangements can retain different treatment.

Do not decide tax treatment solely from the year you make a payment. Review the instrument’s execution date and modification wording. Federal and California treatment may differ for older instruments; this calculator performs neither tax calculation.

Frequently asked questions

Q1: Can I add child support to this result?

A: Not as a reliable combined court estimate. The California Child Support Calculator covers a separate calculation, but independently produced figures may miss interactions between the obligations.

Q2: Does moving in with a new partner automatically end support?

A: No. Cohabitation can create a rebuttable presumption of reduced need, subject to written agreements and the court’s findings. Do not treat it like an automatic cancellation or change payments merely because this calculator shows a lower amount.

Q3: What happens if a spouse dies?

A: Unless the parties agree otherwise in writing, the support obligation generally terminates on either party’s death; remarriage of the supported spouse is another statutory termination event. Existing arrears and estate issues need separate review. The California Probate Fee Calculator concerns estate-administration fees, not continuing alimony or enforceable support claims.

Q4: What should I do if my income changes?

A: Keep income records and review the existing order or agreement with a family-law professional or court self-help service. A changed estimate does not amend an order. Seek appropriate modification promptly rather than simply reducing payments yourself.