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California LocalizedGenerated accuracy model review: 2026-05-06
California Paycheck Calculator accuracy and testing
This page documents how Calwarden builds trust for this calculator: source notes, regression-style default tests, limitations, assumptions, unit handling, rounding, and visible change history.
Formula source
- Estimated net pay = gross pay - pretax deductions - taxable wages x editable tax rates - post-tax deductions, with taxable wages floored at zero.
Test cases
Default input regression check
Generated from the checked-in default inputs and calculate function.
Inputs
- Gross Pay: $3,000
- Pretax Deductions: $200
- Federal Withholding Rate: 12%
- California Withholding Rate: 6%
- Social Security Rate: 6.2%
- Medicare Rate: 1.45%
- California SDI Rate: 1.1%
- Local or Other Rate: 0%
- Post-Tax Deductions: $50
Expected outputs
- Estimated Net Pay: $2,001.00
Known limitations
- This tool does not prepare payroll, determine legal withholding, apply current wage bases automatically, or replace employer payroll software.
Assumptions
- Taxable wages equal gross pay minus pretax deductions, floored at zero.
- All percentage inputs are applied to taxable wages as simplified reserves.
- This does not model filing status, allowances, wage bases, supplemental rates, benefits, garnishments, or payroll-provider rounding.
- Defaults are planning examples, not live current rates.
- The calculation is deterministic and runs client-side only.
Unit handling
- Gross Pay accepts values in $.
- Pretax Deductions accepts values in $.
- Federal Withholding Rate accepts values in %.
- California Withholding Rate accepts values in %.
- Social Security Rate accepts values in %.
- Medicare Rate accepts values in %.
- California SDI Rate accepts values in %.
- Local or Other Rate accepts values in %.
- Post-Tax Deductions accepts values in $.
- Estimated Net Pay is displayed as currency.
Rounding rules
- Number displays use up to 2 decimal places in the calculator UI.
- Currency outputs are displayed with standard US dollar formatting.
- Input precision follows configured step values where provided.
Version history
1.0.0 - 2026-05-06
Generated accuracy and testing page from the current california-paycheck-calculator calculator definition.
Change log
2026-05-06
Published default regression test documentation and metadata fallbacks for California Paycheck Calculator.
Calculator transparency
Accuracy pages are generated from checked-in calculator definitions and can be upgraded with curated review metadata over time.