Proportional Share of Extraordinary Child Expenses, Explained

Several child support systems — for example, special or extraordinary expenses (often called section 7 expenses in Canada) — share certain extra costs in proportion to each parent's income. The usual arithmetic: each parent's income divided by the combined income gives their share; with $60,000 and $40,000 that's 60/40. Whether a cost qualifies, and whether any tax credits or subsidies are deducted first, depends on your order and local rules — check those with your lawyer or the official guidelines for where you live.

Once you know the ratio, enter it (Maria:60; Sam:40) and Kidtally applies it to every shared row and shows the 5- and 10-point what-ifs.

Last reviewed 2026-11-04. General information, not legal or financial advice.