California Divorce Settlement Calculator: Support, Property, Taxes

There is no single California divorce settlement calculator that produces one bottom-line number, because a California settlement is really four separate calculations stitched together: a guideline formula for temporary spousal support while the case is pending, a statutory formula for child support, a judge-driven multi-factor analysis for long-term spousal support, and a presumptive 50/50 division of community property. Each runs on different inputs and different rules. To estimate what your settlement might look like, you have to work through them one at a time.

Temporary Spousal Support While the Case Is Pending

This is the one piece of a California settlement that behaves like an actual calculator. While the divorce is in process, a judge can order temporary support to keep both households stable. Most California courts start from a guideline formula: 40% of the higher earner’s net monthly income minus 50% of the lower earner’s net monthly income.¹

If one spouse nets $10,000 a month and the other nets $3,000, the math is $4,000 minus $1,500, which comes out to $2,500 per month. The Santa Clara County version of this formula has long been the dominant model, though some counties use variations.²

The formula is a guide, not a mandate. Judges can adjust the amount for unusually high medical expenses, a child’s college costs, significant savings, or other circumstances.¹ Important to know: this formula applies only while the case is pending. The long-term support number that ends up in the final judgment is calculated a completely different way.

Child Support

California’s guideline child support calculation is set out in Family Code Section 4055 and uses the formula CS = K[HN – (H%)(TN)]. In plain terms: the formula takes both parents’ combined net monthly income, determines what percentage should go to the children based on income level, and then adjusts for how much time each parent has physical custody of the children.³

The variables are:

HN: the higher earner’s net monthly disposable income.
TN: both parents’ combined net monthly disposable income.
H%: the approximate percentage of time the higher earner has primary physical responsibility for the children.
K: a factor that determines how much of the combined income goes to child support, drawn from income-bracket tables.³

For more than one child, the result is multiplied by a statutory factor: 1.6 for two children, 2.0 for three, 2.3 for four, and so on. The guideline figure is presumed correct under Family Code Section 4057(a), and judges can deviate only when specific factors justify it, such as extraordinarily high income, special medical needs, or significantly unequal housing costs.³

What Counts as Net Disposable Income

The whole formula runs on net disposable income, so getting that number right matters. Under Family Code Section 4058, gross income includes wages, salaries, commissions, bonuses, dividends, interest, rental income, trust income, business profits, unemployment and disability benefits, Social Security, severance pay, and spousal support received from someone outside the current case. It does not include child support received or need-based public assistance.⁴

From gross income, the law subtracts federal and state income tax, FICA, mandatory union dues and retirement contributions, health insurance premiums, state disability premiums, existing court-ordered support obligations, court-approved job-related expenses, and hardship deductions for extraordinary health costs or uninsured catastrophic losses.⁵ When a parent’s actual income is unknown or understated, courts can impute earning capacity based on assets, work history, skills, education, health, and the local job market.⁴

Recent Changes Under SB 343

Senate Bill 343, effective September 1, 2024, recalibrated the income bands used to determine the K-factor. The lowest income bracket now covers net disposable income up to $2,900 per month, roughly aligned with full-time minimum wage, to ease the support burden on the lowest-earning parents. The law also expanded the definition of income to include severance pay, non-need-based veterans’ benefits, and military housing and food allowances. Add-on expenses like uncovered medical costs, childcare, and extracurricular activities are now allocated based on each parent’s relative net income rather than split 50/50.⁶

Long-Term Spousal Support

Here the calculator analogy falls apart. Long-term (sometimes called “permanent”) spousal support has no formula. There is no software that will give you a reliable number. Judges take what the California Courts describe as a “big picture look” at the marriage, weighing the factors listed in Family Code Section 4320.⁷

Those factors include each spouse’s earning capacity and the marketable value of their skills, whether one spouse supported the other’s education or career, the paying spouse’s ability to pay, the standard of living established during the marriage, the length of the marriage, each spouse’s age and health, their debts and separate property, any history of domestic violence, tax consequences, and the overall balance of hardships.⁸

The law sets a goal that the supported spouse become self-supporting within a reasonable time, generally defined as half the length of the marriage. For marriages shorter than ten years, support typically lasts about half the marriage’s duration. Marriages of ten years or longer are classified as “long duration,” and courts may award support indefinitely, subject to later modification.⁸ A long marriage does not guarantee indefinite support, however; judges weigh every Section 4320 factor case by case.

California places no explicit income cap on spousal support, so high-income cases can produce substantial awards keyed to the marital lifestyle, with courts paying particular attention to the stability of income and the payer’s ability to pay without hardship.⁹

Dividing Community Property

California is a community property state. Assets acquired and debts incurred during the marriage are presumed owned equally by both spouses, and Family Code Section 2550 requires the court to divide the community estate equally unless the spouses agree otherwise. Assets owned before the marriage, received as gifts or inheritances at any time, or acquired after the date of separation are separate property and stay with the spouse who owns them.¹⁰

When one spouse ends up with more than half of the net community assets, an equalization payment to the other spouse closes the gap. Courts can deviate from strict equality for financial misconduct (deliberately hiding or spending community assets), personal injury awards, or educational debt, which is generally assigned to the spouse who got the education.¹¹

Why the Date of Separation Matters So Much

The date of separation is the single most consequential line in a California settlement. It divides community property (everything before) from separate property (everything after). Under Family Code Section 70, enacted in 2017 to overturn Marriage of Davis, the separation date is the point when a complete and final break in the marital relationship occurred. Establishing it requires two things: one spouse expressed to the other the intent to end the marriage, and that spouse’s conduct was consistent with that intent.¹²

Under the current rule, spouses can establish a separation date even while still living under the same roof. Because post-separation earnings are separate property under Family Code Section 771(a), even a few months’ shift in the date can move significant income out of or into the community pot.¹³

The Family Home

The family residence is usually the biggest single asset to value. Equity is calculated by taking the current market value, generally from a formal appraisal, and subtracting the mortgage, any second mortgage or home equity line of credit, and tax liens.¹⁴ The net equity is divided equally unless one spouse can trace a separate property contribution, such as a premarital down payment or inherited funds.

Couples usually resolve the home in one of three ways: selling it and splitting proceeds, having one spouse buy out the other through a cash-out refinance or asset swap, or structuring installment payments when an immediate buyout is not feasible.¹⁴ The buying spouse must refinance into their own name to remove the departing spouse from mortgage liability. If they cannot qualify alone, a buyout may not be workable and the court may order a sale.

Epstein Credits and Watts Charges

When one spouse moves out after separation, two adjustments often appear in the settlement. An Epstein credit, from the 1979 case Marriage of Epstein, reimburses a spouse who uses separate property income to pay down community debt such as the mortgage after separation. It’s typically one-half of the qualifying payments, usually limited to principal reduction.¹⁵

A Watts charge, from the 1985 case Marriage of Watts, cuts the other direction. If one spouse has exclusive use of the home after separation, the other may be owed one-half of the home’s reasonable rental value for that period.¹⁵ In practice, courts calculate both and offset them. A spouse paying $3,000 a month in mortgage while living in a home with a $3,000 monthly rental value would see the credit and the charge cancel out.¹⁶ A spouse seeking a Watts charge needs to give written notice early in the case; failing to do so can cost them the claim.

Retirement Accounts and Pensions

Retirement benefits earned during the marriage are community property. How they get divided depends on the type of account.

Employer-sponsored plans like 401(k)s, 403(b)s, and defined benefit pensions governed by ERISA need a Qualified Domestic Relations Order (QDRO), a court order that instructs the plan administrator to pay a portion to the non-employee spouse. Defined contribution accounts may offer a lump-sum distribution or an IRA rollover; defined benefit pensions typically pay monthly.¹⁷ IRAs don’t require a QDRO; a direct trustee-to-trustee transfer referenced in the divorce decree avoids taxes and early withdrawal penalties.¹⁸

Public pensions like CalPERS commonly use the “time rule.” Service credit accrued during the marriage is divided by total service credit, multiplied by the pension benefit, and then split (usually 50/50) between the spouses.¹⁹

One boundary worth flagging: military pensions follow federal rules under the Uniformed Services Former Spouses’ Protection Act. California courts can divide them as community property, but for the Defense Finance and Accounting Service to pay the former spouse directly, the marriage must have overlapped with at least ten years of creditable military service. Otherwise the service member pays the former spouse directly.²⁰

Stock Options and RSUs

In California’s tech economy, equity compensation is often a major piece of the community estate. Vested grants held at the date of separation are straightforward community property. Unvested grants are harder because the work earning them may have spanned both the marriage and the time after separation.

Courts use two time-based formulas to apportion the community share:

The Hug formula (from Marriage of Hug, 1984) applies when grants rewarded past performance. It divides the months from start of employment to date of separation by the months from start of employment to vesting. This usually produces a larger community share.
The Nelson formula (from Marriage of Nelson, 1986) applies when grants are primarily retention incentives. It divides the months from grant date to date of separation by the months from grant date to vesting, generally yielding a smaller community share.²¹

Once the community portion is set, equity can be divided in kind (the administrator delivers the non-employee spouse’s share at vesting), offset against other assets, or equalized with cash.²¹ Income from vesting RSUs can also feed into spousal and child support calculations as bonus income.²²

Taxes Change the Real Value of a Settlement

Every piece of a settlement has a tax dimension, and ignoring it will throw off any estimate.

Spousal support treatment depends on when the order was signed. For orders executed before January 1, 2019, payments are deductible by the payer and taxable to the recipient on both federal and California returns. For orders executed between January 1, 2019 and December 31, 2025, federal law eliminated the deduction, but California still allowed it, requiring a Schedule CA adjustment.²³ Starting January 1, 2026, under California Senate Bill 711, the state aligns with federal law: for orders signed on or after that date, spousal support is neither deductible by the payer nor taxable to the recipient at either level.²⁴ Older orders modified after December 31, 2025 keep their original tax treatment unless the modification expressly adopts the new rules.²⁵

Child support is never deductible by the payer and never taxable to the recipient. Property transfers between spouses under a divorce are not taxable events at the time of transfer under IRC Section 1041, but the receiving spouse takes the original cost basis and will owe capital gains tax on any appreciation when the asset is eventually sold. For a family home, each spouse can exclude up to $250,000 in capital gains if the property was their principal residence for two of the preceding five years.²³ Filing status is set by marital status on December 31: a divorce final by year-end means each spouse files as single or, if eligible, head of household.²⁶

What Attorneys and Judges Actually Use

Nobody runs the child support or temporary spousal support formulas by hand. California requires certified software for accuracy. For decades the standard was DissoMaster, which was discontinued on March 31, 2025. Since April 1, 2025, Xspouse has been the primary Judicial Council-certified calculator for guideline child and temporary spousal support figures. Xspouse applies the Section 4055 formula, generates temporary spousal support based on each court’s local guideline, and handles federal and California tax calculations, hardship deductions, and the SB 343 changes.²⁷

The California Department of Child Support Services also offers a free online guideline calculator for public use, though as of mid-2026 it has been temporarily decertified because it does not yet reflect tax changes from the July 2025 federal budget bill.²⁸ For a rough self-estimate on temporary spousal support, the 40%/50% formula gets you in the right neighborhood. For child support, the number produced by hand is likely to miss by enough that you’ll want certified software or an attorney’s calculation before relying on it.

Changing a Settlement Later

Long-term spousal support orders can be modified, but the requesting spouse has to show a significant change in financial circumstances. The process involves filing a Request for Order (form FL-300) with updated income documentation and a $60 filing fee. The judge reevaluates support using the same Section 4320 factors.²⁹

Spousal support ends automatically if the receiving spouse remarries or if either spouse dies. Courts may also reduce or terminate support if the recipient begins cohabiting with a new romantic partner, becomes self-supporting ahead of schedule, receives a large inheritance, or is convicted of domestic violence against the paying spouse. For the payer, involuntary job loss, serious illness, disability, or good-faith retirement can justify a reduction.³⁰ Any modification is retroactive only to the date the paperwork was filed, so a payer who simply stops paying without a court order risks contempt findings and wage garnishment.³¹

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