At the beginning of almost every case involving children, our clients ask, “How much child support will I have to pay?” It’s a great question and a complex answer.
California adopted a statewide child support guideline that uses a mathematical formula to determine support. Rather than selecting a number based on what seems fair, judges generally rely on specialized computer software to calculate guideline child support. One of the most commonly used programs throughout California is XSpouse, which applies the statutory formula contained in California Family Code section 4055.
We regularly prepare child support calculations, analyze competing calculations prepared by opposing counsel, and identify errors that can significantly impact the amount of support ordered.
California Uses Guideline Child Support
California law presumes that the guideline amount of child support is the correct amount to be ordered. The Legislature designed the guideline to ensure that children receive adequate financial support while sharing in the standard of living of both parents. The calculation is intended to produce consistent and predictable results rather than relying on a judge’s subjective opinion.
Although the mathematical formula appears straightforward in the Family Code, it is rarely calculated manually. Instead, courts, attorneys, and family law professionals typically use certified software programs such as XSpouse to perform the calculation accurately.
What Is XSpouse?
XSpouse is a California family law software program used by attorneys, judges, mediators, and family law professionals to calculate guideline child support and spousal support.
The program applies California’s statutory formula after entering dozens of financial variables, including:
- Each parent’s gross monthly income
- Federal and state tax filing status
- Bonuses, commissions, overtime, and self-employment income
- Mandatory retirement contributions
- Union dues
- Health insurance premiums
- Mortgage interest and property taxes (where applicable)
- Existing child or spousal support obligations
- Child care expenses
- The percentage of parenting time each parent exercises
- Certain hardship deductions and other allowable adjustments
Because even minor changes to these inputs can dramatically affect the result, it is critical that the information entered into XSpouse is accurate and supported by admissible evidence.
Income Is More Than Just a Paycheck
Many people mistakenly believe that child support is based solely on salary. California Family Code section 4058 broadly defines income and generally includes income from almost every source, including:
- Wages and salaries
- Bonuses
- Commissions
- Self-employment income
- Rental income
- Business distributions
- Investment income
- Pension income
- Disability benefits (in many circumstances)
- Unemployment benefits
For self-employed individuals or business owners, determining actual income often requires a detailed review of business records, tax returns, profit and loss statements, balance sheets, bank records, and QuickBooks data. Experienced family law attorneys frequently uncover income that may not be apparent from a tax return alone. For very complex income sources, family law attorneys may obtain the assistance of a forensic accountant.
Parenting Time Has a Significant Impact on Child Support
One of the most important factors affecting child support is each parent’s percentage of custodial time, often referred to as the “timeshare.”
Under Family Code section 4055, the formula specifically considers the approximate percentage of time that the higher-earning parent has primary physical responsibility for the children.
Generally speaking, the more parenting time the higher-income parent exercises, the lower that parent’s child support obligation may become. Conversely, if one parent has very limited parenting time, child support will generally increase.
It is important to understand that timeshare is based primarily on the amount of time each parent is responsible for the children—not simply the custody labels contained in a court order.
Even relatively small changes in parenting schedules can significantly affect a child support calculation. For example, increasing parenting time from 20% to 35% may substantially reduce the amount of child support owed, depending on the parties’ respective incomes.
Does 50/50 Custody Eliminate Child Support?
The answer is no. One of the most common misconceptions is that equal parenting time means neither parent pays child support. That is simply not true. Even when parents share physical custody equally, child support may still be ordered if one parent earns substantially more than the other. California law seeks to ensure that children enjoy a reasonably comparable standard of living in both households. As a result, the higher-earning parent will often continue to pay guideline child support despite exercising equal parenting time.
Additional Expenses May Be Added to Guideline Support
The monthly guideline child support amount is not always the end of the analysis. California law permits the court to allocate certain mandatory and discretionary “add-on” expenses, including:
- Work-related child care
- Necessary educational expenses
- Uninsured medical expenses
- Health insurance premiums for the children
- Certain travel expenses related to visitation
- Other special needs of the children
These expenses are typically allocated between the parents in proportion to their respective incomes rather than divided equally.
How Long Does Child Support Last?
In most cases, California child support continues until the child reaches 18 years of age.
However, support generally continues until age 19 if the child:
- Is unmarried;
- Is still a full-time high school student;
- Is not self-supporting; and
- Is reasonably expected to graduate before turning 19.
Child support may continue beyond age 19 only in limited circumstances, such as when an adult child is incapacitated from earning a living due to a disability.
Although child support terminates by operation of law in many cases, parents should not assume payments automatically stop under every circumstance. Existing wage assignments and court orders should be carefully reviewed before discontinuing payments.
Child Support Can Be Modified
Child support is not necessarily permanent.
Either parent may request a modification whenever there has been a material change in circumstances, including:
- An increase or decrease in either parent’s income;
- A job loss;
- A significant increase in earnings;
- A change in parenting time;
- Retirement;
- Disability;
- A change in child care expenses; or
- Other circumstances affecting the guideline calculation.
Because California’s guideline formula is driven largely by current financial information and parenting time, modifications are common throughout the pendency of a case.
Accurate Calculations Matter
Child support calculations are only as accurate as the information entered into the software. An incorrect income figure, inaccurate parenting schedule, overlooked deduction, or improperly characterized source of income can result in child support orders that differ by hundreds—or even thousands—of dollars each month.
At The Soleymani Law Firm, APC, we carefully analyze financial documents, review business records, prepare accurate XSpouse calculations, and advocate for child support orders that comply with California law while protecting our clients’ rights and their children’s best interests.
If you have questions regarding child support, parenting time, or a possible modification of an existing support order, please contact us to schedule a consultation with an experienced California family law attorney.
Relevant California Family Code Sections
- Family Code §§ 4050–4076 — California Child Support Guideline
- Family Code § 4053 — Guiding Principles
- Family Code § 4055 — Guideline Formula
- Family Code § 4057 — Presumption Guideline Is Correct
- Family Code § 4058 — Definition of Income
- Family Code § 4059 — Net Disposable Income
- Family Code §§ 4061–4063 — Child Support Add-On Expenses
- Family Code §§ 3651–3653 — Modification of Child Support Orders