Before using the result
How this spousal support calculator works
The calculator does only the arithmetic described below. It cannot resolve disputed facts, calculate tax liability, choose a county’s procedure, or predict what a judge will decide. Use it to see how a changed input affects the number and what needs outside help.
Santa Clara temporary guideline
40% payor net−50% payee net→Zero floor
Use tax-adjusted monthly net income left after child support and child-related expenses. Santa Clara Rule 3.C generally uses this method. Los Angeles Rule 5.10 lets a judge use the Santa Clara guideline; it does not publish a separate Los Angeles equation. For another county, the result is only a comparison.
Temporary versus final support
The county formula stops where the §4320 analysis begins
| Selected locality | Calculator label | Important limit |
|---|---|---|
| Santa Clara County | Rule 3.C generally uses the guideline | It applies to temporary support; taxes and child support still matter |
| Los Angeles County | Rule 5.10 allows use of Santa Clara’s guideline | The judge may use it but is not required to reach this number |
| Another California county | A comparison only | Read that court’s current temporary-support rules |
| Support at judgment | No statewide formula | The judge applies every relevant §4320 factor |
Worked example
Example: $8,000 payor net and $3,500 payee net after child support
- 1Calculate the payor component
$8,000 × 40% = $3,200.
- 2Calculate the payee component
$3,500 × 50% = $1,750.
- 3Subtract and stop at zero
$3,200 − $1,750 = $1,450 a month under the temporary guideline.
- 4Apply the county rule
Santa Clara generally uses the guideline; Los Angeles may use it. Another county may not, and no county can use this shortcut to decide support at judgment.
How marriage length matters
Ten years can preserve jurisdiction; it does not promise lifetime payments
General self-support reference
If the marriage is not treated as long duration, §4320 generally describes half its length as a reasonable self-support period, subject to the judge’s discretion.
Rebuttable long-duration presumption
Section 4336 ordinarily preserves jurisdiction. It does not establish the amount, require support, or set a lifetime duration.
What the judge still decides
Do not use a temporary figure to value the final award
This tool shows
- Which county rule was selected
- The 40% payor component
- The 50% payee component
- The temporary difference, floored at zero
- General marriage-length context
The judge must decide
- Every applicable §4320 factor
- Need, marital standard of living, and ability to pay
- Earning capacity and progress toward self-support
- Domestic violence and specified criminal convictions
- Amount, duration, modification, and termination
Records to gather
Prepare separate evidence for the interim and final requests
- Recent tax returns, pay statements, business records, benefit records, and proof of recurring income.
- The tax calculation and child-support treatment used to reach each after-support net figure.
- Date of marriage, date of separation, and evidence relevant to the marital standard of living.
- Monthly needs, education, work history, job-market evidence, health, age, property, and debt.
- Any domestic-violence findings, criminal convictions, prior support orders, and written agreements.
- The selected county’s current temporary-support rules and required software printouts.
Common questions
What California law says about this calculation
Does California have a statewide alimony formula?
No formula sets final support statewide. At judgment, the court must consider every applicable factor in Family Code §4320. A county may use a guideline for temporary payments while the case is pending, but that interim method does not decide the final award.
What does the California spousal support calculator show?
It shows Santa Clara County's temporary guideline: 40% of the payor's tax-adjusted net income minus 50% of the payee's, after accounting for income allocated to child support and child-related expenses. Los Angeles Rule 5.10 allows a judge to use that guideline. Other counties may use a different method.
Does a 10-year marriage guarantee lifetime support?
No. Ten years creates a rebuttable presumption that the marriage is long duration for purposes of retained jurisdiction. The court may still deny, modify, or terminate support; the statute promises neither an amount nor lifetime payments.
How long does support last after a shorter marriage?
For a marriage that is not treated as long duration, §4320 generally describes one-half the marriage length as a reasonable time for the supported spouse to become self-supporting. The judge can choose a shorter or longer period after considering the rest of the statute.
What factors affect long-term spousal support?
The court looks at earning capacity, career contributions, ability to pay, needs measured against the marital standard of living, assets and debts, marriage length, dependent children, age and health, documented domestic violence, taxes, hardships, the goal of self-support, and any other just and equitable circumstance.
When does California spousal support terminate?
Unless a written agreement says otherwise, the obligation generally ends when either party dies or the supported spouse remarries. Cohabitation is different: it can create a rebuttable presumption of reduced need, but it does not automatically end support.
Read the law and court instructions
Sources for the rules on this page
- California Family Code §4320 — long-term spousal support factors
Section 4320 lists the factors a court must consider for support at judgment and the general self-support goal for a marriage not treated as long duration.
- California Family Code §4336 — long-duration marriages
Section 4336 creates a rebuttable long-duration presumption at 10 years for retained jurisdiction. It does not award support or promise lifetime payments.
- Santa Clara County family rules — temporary support formula
Santa Clara Rule 3.C generally uses 40% of the payor's net income minus 50% of the payee's net income for temporary support, adjusted for taxes and income allocated to child support or child-related expenses.
- Los Angeles County Local Rule 5.10
Los Angeles Rule 5.10 says the court may use Santa Clara County's guideline when deciding temporary spousal support.