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Notes from CleanCalc
Engineer-first writing on California child-support math — the statute, the cases that shape it, and the calculator we built to make the formula visible.
By The CleanCalc Team · RSS
§4058(b) imputation: when a California court treats a parent as earning what they could earn
California's §4058(b) lets a court substitute earning capacity for actual income — but only on specific findings. Here's the test, the case law, and the math.
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- 11 min read
California child support when you're self-employed: the §4058 math that incumbents skip
Most CA guideline calculators treat 1099, sole-prop, and S-corp income like a W-2. The result is wrong. Here is what §4058 actually says — with the math.
- 10 min read
Post-SB 343: why your 2023 California child-support calculator is wrong
§4055 K-factor table changed September 1, 2024 — and so did the low-income presumption. If your calculator predates that, the number is wrong.
- 10 min read
DissoMaster is dead. Here's what to use instead — and what's actually 'certified.'
DissoMaster, the bench-tool standard for CA child support, was discontinued in 2025. The post-DissoMaster landscape — and what 'certified' actually means.
- 12 min read
When the §4055 guideline isn't the answer: §4057 deviation, in plain English
California courts treat §4055 as presumed correct — but §4057 lets them deviate. Here's what triggers deviation, what §4056 requires, and the math.