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Routes: Law Desk · Family Law / Child Support
The “How Do They Get That Number?” Hook
Child support in California isn’t a guess and it isn’t up to the judge’s mood — it comes out of a statewide formula that every court uses. Understanding what drives the number is the difference between feeling blindsided and being prepared. Ava asked attorney Michael Benavides how the math really works.
Ava Asks, Michael Answers — Child Support, Plain English
Ava:
Is child support negotiable, or is there a set formula?
Michael, Esq.:
There’s a formula. Family Code section 4055 sets a statewide uniform guideline, and courts are required to follow it. The shorthand version is CS = K times [HN minus (H% times TN)] — but you don’t need the algebra. What matters is what feeds it.
Ava:
So what actually drives the number?
Michael, Esq.:
Two things above all: each parent’s income and how much time each parent spends with the child. The more time the higher earner has the child, the lower the transfer usually is. Income plus timeshare — that’s the engine.
Ava:
What counts as income?
Michael, Esq.:
Broadly, money from almost any source — wages, salary, bonuses, commissions, self-employment, and more. The guideline runs on each parent’s net monthly disposable income, meaning income after taxes and certain allowable deductions, not gross.
Ava:
I heard the formula changed recently. True?
Michael, Esq.:
Yes, and it matters. Effective September 1, 2025, a state law update changed part of the guideline calculation to work from net income for the first time in decades. It can shift the numbers for both lower-income and higher-income parents, so an old estimate may no longer be accurate.
Ava:
What if the paying parent barely earns anything?
Michael, Esq.:
The guideline has a low-income adjustment. When the paying parent’s net income falls below roughly full-time minimum wage, there’s a rebuttable presumption that support should be reduced so the order stays realistic rather than crushing.
Ava:
Can a parent dodge support by quitting or working under the table?
Michael, Esq.:
Not easily. Courts can base support on earning capacity — what a parent could earn — not just what they report. Deliberately going underemployed to lower support tends to backfire once a judge sees it.
Ava:
Can we just agree to our own number?
Michael, Esq.:
Parents can agree, but the court still measures it against the guideline and won’t rubber-stamp an amount that shortchanges the child. Support is the child’s right, so a judge keeps a check on any deal.
What to Do
California child support runs on the Family Code section 4055 guideline — income and timeshare in, a required number out — and a 2025 change to how the formula reads income means older estimates may be stale. Before you accept or challenge an amount, get the inputs right. A free Law Desk consult runs your real numbers and flags anything — earning capacity, hidden income, timeshare — that could move the result.
Law Desk by Michael Benavides, Esq. — free family-law consult | CA Bar No. 270714 | Sacramento, Modesto, San Jose, San Francisco & Oakland | 707-362-4166 | attorneymichaelbenavides.com
ATTORNEY ADVERTISING. Law Desk is a legal-content brand of the law practice of Michael Benavides, Esq., California State Bar No. 270714. Ava is an editorial brand voice, not an attorney; only Michael Benavides, Esq. provides legal analysis. General information only — not legal advice; no attorney-client relationship is formed by reading this. Authority referenced (Cal. Family Code § 4055 and 2023–2025 guideline amendments effective Sept. 1, 2025) is as of mid-2026; child-support figures and thresholds adjust periodically — verify current numbers before acting. Prior results do not guarantee a similar outcome.
