Ontario Child Support Calculator — 2025 Federal Tables

Paying parent’s annual income before tax

Other parent’s annual income optional

Children covered

Add section 7 special or extraordinary expenses

Enter the monthly net expense after subsidies, benefits, tax effects, and any contribution from the child. The split below uses each parent’s share of combined gross income as a planning estimate.

Net monthly expense

Planning information only, not legal advice or a court result. Parenting arrangements, income adjustments, undue hardship, adult children, split parenting, and other facts can change the amount.

How the estimate works

The table amount usually starts with three facts: the paying parent’s annual income, the number of children entitled to support, and the province where that parent lives. This calculator uses Ontario’s table and the federal figures in force from October 1, 2025.

1. Choose the arrangement

Use majority parenting when one parent has more than 60% of parenting time.

2. Enter annual income

For many employees, line 15000 of the tax return is a starting point, not always the final figure.

3. Read the estimate

The result uses the 2025 legal table formulas and rounds to the nearest dollar.

Shared parenting is not just subtraction

Shared parenting applies when each parent exercises at least 40% of parenting time over a year. The difference between each parent’s table amount is a useful starting point, and that is what this calculator shows.

The Guidelines also require consideration of the increased costs of shared parenting and the conditions, means, needs, and circumstances of each parent and child. A court result may therefore differ from the set-off shown here.

Section 7 expenses

Special or extraordinary expenses can include work-related child care, the child’s share of medical or dental insurance, certain uninsured health costs, qualifying education, post-secondary education, and extraordinary extracurricular activities.

The guiding principle is proportional sharing by income after deducting the child’s contribution. Subsidies, benefits, deductions, and credits connected to the expense must also be considered. Use the net monthly expense field only after those adjustments.

When income needs a closer look

Employment income

Line 15000 of the latest tax return is often a starting point. Current information should be used, and recent pay changes may matter.

Variable earnings

Bonuses, commissions, overtime, investment income, or a fluctuating income can require a multi-year review rather than one tax return.

Self-employment or corporations

Business deductions and income retained in a corporation may need adjustment under the Guidelines.

Income above $150,000

The table formula continues above $150,000, but a court may use a different amount if the table result is inappropriate.

Common questions

Are the 2025 tables automatic for an older agreement?

No. A pre-October 1, 2025 order or agreement does not automatically change, though a different updated table amount may support a recalculation or variation.

Why might the official lookup differ by a dollar?

The Department of Justice notes that simplified table results may differ slightly because income is rounded to the nearest $100. This calculator follows the legal table bands and rounds the monthly estimate to the nearest dollar.

Does the table amount include section 7 expenses?

No. The basic table amount and section 7 special or extraordinary expenses are separate. The optional expense split is shown separately.

What about five or more children?

This calculator currently covers one to four children. Use the official 2025 Ontario tables linked below for five or more children.

Official sources

Source tables checked October 4, 2026. The updated tables apply to support periods from October 1, 2025 onward. Only the official tables are legal documents.