Is child support in Ontario based on gross income or net income?

Child support under the Child Support Guidelines is based on gross annual income, not net income after taxes. This is a common point of confusion, especially for payors who feel that their take-home pay does not reflect the income figure used to calculate their obligation.

The reason the Guidelines use gross income is consistency. After-tax income varies depending on individual deductions, RRSP contributions, tax credits, and other factors that differ between taxpayers. Using gross income as the starting point — before personal deductions but after adjustments specified in the Guidelines — creates a uniform basis for comparison and is harder to manipulate.

The Guidelines do prescribe certain adjustments to income before applying the tables. These adjustments (set out in Schedule III of the Guidelines) include items like union dues, child care expenses paid by the payor, and certain other deductions. But these are specific and limited. The payor's personal income tax deductions and RRSP contributions, for instance, do not reduce the income figure used for support. This means a payor may feel the obligation is higher relative to their actual take-home pay than they expected. Understanding how your income is calculated under the Guidelines is an important first step in any support discussion.