What Is the DissoMaster? California's Child and Spousal Support Calculation Tool Explained
Quick Answer: The DissoMaster is a software program used by California family law courts and attorneys to calculate guideline child support and spousal support obligations. It uses financial data from each spouse's income and expense declarations to produce a standardized support figure consistent with California's statutory guidelines. California superior courts have relied on the DissoMaster for over two decades, and its output is routinely used in settlement negotiations and court hearings.
If you have questions about support calculations in your California divorce, contact The Geller Firm at (415) 840-0570 for a confidential consultation.
Why Does California Use Software to Calculate Support?
Child support and spousal support are among the most contested issues in California divorce proceedings. Disputes over support can drag on for months and consume significant legal fees when parties cannot agree on figures. To address this, California law establishes a uniform statewide guideline formula for child support under Family Code § 4055 that is designed to produce consistent, objective results regardless of which court or county handles the case.
The DissoMaster translates that statutory formula into a practical calculation tool. By entering the relevant financial figures from each party's income and expense declarations, attorneys and judges can quickly generate a guideline support figure that reflects California law. This standardizes the process, reduces disputes over arithmetic, and gives both parties a neutral starting point for negotiations.
What Is the DissoMaster?
The DissoMaster is a proprietary software program widely used by California family law practitioners and courts to compute child support and spousal support obligations. It is designed to apply California's guideline support formula to the specific financial circumstances of each case and produce a report that summarizes income, deductions, and resulting support figures.
While the DissoMaster is the most widely used program of its kind in California, it is worth noting that other similar programs exist, including XSpouse. Courts and attorneys may use either, but the underlying statutory formula they apply is the same.
What Information Does the DissoMaster Use?
The DissoMaster pulls its calculations from the financial data each spouse discloses through the mandatory FL-150 Income and Expense Declaration. Accurate and complete financial disclosures are therefore essential to producing a reliable DissoMaster result. Information entered into the program typically includes:
Each spouse's gross monthly income from all sources
Tax filing status and applicable deductions
Health insurance premium costs
Mandatory retirement contribution amounts
Childcare costs
The percentage of time each parent has physical custody of the children, called the timeshare
Any other income or expense factors relevant under the statutory guidelines
Because the output is only as accurate as the data entered, disputes over support often come down to disputes over the underlying financial figures rather than the formula itself.
What Are the Three Components of a DissoMaster Report?
A standard DissoMaster report is organized into three primary sections:
Component 1: Income Information
The first section presents each party's income information, displayed as monthly or annual figures. There are separate columns for each parent, typically labeled by party rather than by gender in modern practice. This section reflects gross income from all sources before deductions are applied.
Income sources the program accounts for include wages and salary, self-employment income, rental income, investment and interest income, pension and retirement distributions, unemployment benefits, and any other regular source of funds.
Component 2: Guideline Support Figures
The second section is the core output of the report. It applies California's guideline formula to the income figures from the first section and produces the following:
Each party's adjusted net monthly disposable income after applicable deductions
Combined net monthly disposable income for both parties
The guideline child support amount the paying parent is obligated to pay, calculated in accordance with Family Code § 4055
An alternative support calculation based on program settings, which may differ from the strict guideline figure
The guideline figure is the starting point for any support order. Courts may deviate from the guideline in limited circumstances, but such deviations require specific findings on the record.
Component 3: Applicable Deductions
The third section details deductions that reduce each spouse's gross income for purposes of the support calculation. Understanding and correctly applying all available deductions is one of the most important and frequently overlooked aspects of support proceedings. Deductions that the DissoMaster accounts for include:
Health insurance premiums. The cost of health insurance coverage for the party and, where applicable, the children is deductible from gross income before the support calculation is run.
Mandatory retirement contributions. Contributions to government retirement plans that are required as a condition of employment, such as CalPERS or CalSTRS contributions, are deductible. Voluntary retirement contributions are treated differently and may not qualify for the same deduction.
Itemized deductions. Certain itemized deductions, including property tax payments and deductible mortgage interest expenses, are factored into the adjusted net income calculation.
Required union dues. Mandatory union dues paid as a condition of employment are deductible from income for support calculation purposes.
Failing to account for all applicable deductions can result in a support figure that overstates the paying party's actual financial obligation. Reviewing the deductions section of any DissoMaster report carefully is an important step in evaluating whether the proposed support amount is accurate.
How Is the DissoMaster Used in California Divorce Proceedings?
The DissoMaster is used at multiple stages of a California divorce:
Settlement negotiations. Attorneys for both parties typically run their own DissoMaster calculations using the financial data available at the time. Comparing the outputs helps identify where the parties agree and where disputes exist regarding the underlying financial figures.
Court hearings. Judges and their staff frequently run DissoMaster calculations during hearings on support motions. The program's output is presented as the guideline figure, and either party may argue for a deviation based on specific statutory grounds.
Temporary support orders. During the pendency of the divorce, a temporary support order may be based on a DissoMaster calculation using each party's then-current income and expense information.
Post-judgment modifications. When either party seeks to modify an existing support order based on changed circumstances, a new DissoMaster calculation using updated financial data is typically central to the proceeding.
Can the DissoMaster Result Be Challenged?
Yes. The DissoMaster output is only as reliable as the data entered into it. Either party may challenge the other's proposed calculation by disputing the underlying financial figures, including:
Understated or overstated income
Improperly claimed deductions
Incorrect timeshare percentages
Failure to account for all sources of income, including bonuses, commissions, or self-employment receipts
In cases involving self-employed spouses, business owners, or parties with complex income structures, forensic accountants are frequently retained to analyze income and expenses and provide an expert opinion on the figures that should be entered into the program.
Frequently Asked Questions
Is the DissoMaster result binding on the court? No. The DissoMaster produces the guideline support figure under California's statutory formula, but courts retain discretion to deviate from the guideline in specific circumstances with appropriate findings. The guideline figure is the starting point, not an automatic outcome.
What happens if one spouse underreports income on their financial disclosures? Understating income to reduce a support obligation is a breach of the spousal fiduciary duty and can expose the disclosing spouse to sanctions, attorney's fees, and modification of the support order once the true income is established. Courts take income concealment seriously.
Can the DissoMaster calculate spousal support as well as child support? Yes. The DissoMaster is used to generate proposed temporary spousal support figures as well, typically using the same guideline formula applied to child support. Long-term spousal support, however, is determined by the court's analysis of the 16 factors under Family Code § 4320 rather than by the guideline formula alone.
How often do DissoMaster figures need to be updated? Whenever there is a material change in either party's financial circumstances, including a change in income, a change in the custody timeshare, or a change in applicable deductions, the DissoMaster calculation should be rerun with the updated figures. This is typically done in connection with any motion to modify support.
Do both parties see the same DissoMaster report? Each attorney typically runs their own calculation and the outputs are compared. Differences between the two parties' proposed calculations usually reflect disagreements about the underlying financial data rather than the program itself.
Speak With a California Divorce Attorney
Support calculations in California divorce can have a significant financial impact on both parties for years after the judgment is entered. Understanding how the DissoMaster works, what goes into it, and where it can be challenged is essential knowledge for any divorcing spouse. The Geller Firm assists clients across California in support proceedings, DissoMaster analysis, income disputes, and post-judgment modification actions.
We offer confidential virtual and in-person consultations from our Walnut Creek office.
Call (415) 840-0570 or contact us online to schedule your consultation.