TREADSTONE LAW · ONTARIO · DIGITAL LEGAL SERVICES · EST. MMXXI ·TSL
Licensed by the Law Society of OntarioFlat fees published upfrontWe reply to messages within 1 business daySign in
Learn/Ask a Lawyer/Family/How Is Child Support…
Family

How Is Child Support Calculated if the Payor Is Self-Employed in Ontario?

TSL Written by the Treadstone Law Team· Updated November 6, 2026

Child support is based on the paying parent's income, and for a self-employed payor that income is not always the number at the bottom of the business accounts. Income starts from "Total income" on the tax return. Where that figure would not be the fairest measure, the court may look at income over the last three years.

A court may impute income where a parent has diverted income, does not reasonably use property to generate income, or unreasonably deducts expenses. A self-employed parent must also provide business or professional practice financial statements for each of the past three years and a breakdown of salaries, wages and benefits paid to others. If disclosure is withheld, the court may draw an adverse inference and impute income.

Dividends and taxable capital gains are counted at the actual amounts received or realized. The online Child Support Service is not available where the payor is self-employed. How write-offs or money left in a company are treated depends on the facts, so confirm with a lawyer or accountant.

Key takeaways

  • Income for child support starts from "Total income" on the tax return, and a court may look at the last three years where that is fairer.
  • A court may impute income where a parent has diverted income or unreasonably deducts expenses.
  • A self-employed parent must provide business or professional practice financial statements for each of the past three years.
  • If disclosure is withheld, the court may draw an adverse inference and impute income.
This is general information, not legal advice. It doesn’t create a lawyer–client relationship, and the rules can change. For advice on your situation, a Treadstone family lawyer can help.

Go deeper

Sources

Links go to official government, court and regulator pages. The law changes — confirm you are reading the current version.

Still have questions?

Search our answers, or send yours to a Treadstone lawyer — we answer in plain language.

All answersStart a File →