Income Shares Calculator

Calculate each party's proportional share of combined household income and split shared financial obligations accordingly.

Person 1 Annual Income ($)

Person 2 Annual Income ($)

Total Shared Monthly Expense ($) (e.g. rent, childcare)

Income Share (Person N) = Income_N ÷ (Income₁ + Income₂)

Monthly Contribution (Person N) = Income Share_N × Total Shared Monthly Expense

Example: Incomes of $60,000 and $40,000 → shares of 60% and 40%. On a $2,000/month expense: Person 1 pays $1,200, Person 2 pays $800.

Income figures are gross (pre-tax) annual amounts.
The income shares model is widely used in child support guidelines across U.S. states (e.g., Cassady v. Signorelli framework) and equitable household budgeting.
Shared expenses are split strictly proportional to income; no adjustments for taxes, deductions, or other obligations are applied here.
For child support calculations, consult your state's official guidelines — many states use income shares tables (e.g., Colorado, Florida, New York).
Reference: National Conference of State Legislatures — Child Support Guideline Models by State (ncsl.org).

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