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California Family Code § 4055 · All inputs on one page · Tax tables current as of 2026-07
Enter each parent's gross monthly income before taxes and deductions. Select the applicable federal filing status. If a parent is self-employed, select Self-Employed to apply the self-employment tax calculation. Optional deductions (health insurance, retirement, union dues) should reflect actual monthly amounts. Enter annual itemized deductions only if they exceed the standard deduction for the selected filing status; otherwise leave at $0. Timeshare represents the percentage of time the child spends with Party 1.
Party 1
Total income before taxes and deductions. See pay stub or W-2 Box 1.
Federal tax filing status from your most recent tax return.
Select Self-Employed if you receive 1099 income or own a business.
Monthly premium you pay for health insurance (not employer-paid).
Only retirement required as a condition of employment (CalPERS, CalSTRS, non-optional pension). Deductible under § 4059(c).
Elective 401(k)/403(b)/IRA contributions. Reduces taxable income but NOT income available for support.
Monthly union dues or required professional association fees.
Child or spousal support actually being paid for another relationship (§ 4059(e)).
Necessary unreimbursed expenses required to perform the job (§ 4059(f)).
Leave at $0 to use the standard deduction for your filing status.
Percentage of overnights per year the child spends with this parent.
Party 2
Total income before taxes and deductions. See pay stub or W-2 Box 1.
Federal tax filing status from your most recent tax return.
Select Self-Employed if you receive 1099 income or own a business.
Monthly premium you pay for health insurance (not employer-paid).
Only retirement required as a condition of employment. Deductible under § 4059(c).
Elective contributions. Reduces taxable income but NOT income available for support.
Monthly union dues or required professional association fees.
Child or spousal support actually being paid for another relationship (§ 4059(e)).
Necessary unreimbursed expenses required to perform the job (§ 4059(f)).
Leave at $0 to use the standard deduction for your filing status.
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Calculated from Party 1 timeshare.
Case Details
Number of children common to both parties in this case.
Work-related childcare costs. Apportioned per § 4061(b) on net income after the support transfer.
Uninsured health-care costs for the children. Apportioned per § 4061(b).