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Annual Income Disclosure for Child Support in Ontario

Learn what annual income disclosure means for child support in Ontario, who must share tax returns, the 30-day deadline and what to do if refused.

Family Law4 min readTSLBy the Treadstone Law Team · OntarioUpdated November 1, 2026
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Key takeaways
  • Each person whose income was used to set a child support order must give every party their latest tax return and notice of assessment each year.
  • The deadline is no later than 30 days after each anniversary of the order.
  • If a parent refuses to share income information, the other parent may apply to court, which may draw an adverse inference and impute income.

Child support is usually based on the paying parent's income, and incomes change. Ontario therefore builds in a yearly exchange of income information so that both parents can see whether the numbers still make sense.

This article explains who has to share what, when, and what options you have if the other parent does not cooperate. Sharing information is not the same as changing the order, so it also covers how a change actually happens.

What annual disclosure requires

Under Guidelines s. 24.1(1), each person whose income was used to set a child support order must give every party their latest tax return and notice of assessment or reassessment. This is due no later than 30 days after each anniversary of the order, together with current information on s. 7 special or extraordinary expenses. The parties may agree otherwise.

Income for child support starts from the Total income line on the tax return. Where that figure would not be the fairest measure, for example because of irregular bonuses or overtime, the court may look at income over the last three years.

Asking for disclosure on request

On written request, made not more than once a year, a paying parent must provide income documents for the three most recent taxation years. The deadline is 30 days after receiving the request, or 60 days if the parent lives outside Canada and the United States.

TypeWho gives whatTiming
Annual disclosureEach person whose income set the order gives latest return and assessmentWithin 30 days after each anniversary of the order
On requestPaying parent gives three years of income documents30 days, or 60 if outside Canada and the U.S.

Special situations

If the other parent refuses

If a parent fails to comply with the disclosure duty, the other parent may apply to court, and the court may draw an adverse inference and impute income. Imputing income can also be available where a parent has failed to provide income information when legally required to.

In a court case, if a party fails to serve or file required financial documents, the court can order them to do so on motion, and the court must also order costs. If someone disobeys an order, the court may make orders that include costs, dismissing a claim, or striking out a document.

Does disclosure change the amount?

Receiving a tax return does not change the order by itself. FRO says only a judge can change the amount in a support order. If an agreement was filed with the court, its support provision can be enforced like a court order, varied under s. 37, or recalculated.

Where there has been a change in circumstances under the guidelines, or new evidence is available, a court may discharge, vary or suspend child support. Whether a particular income change is enough depends on the facts.

Child support does not end automatically when a child turns 18; an order or agreement can set an end date, and if it is silent, both parties must agree to end payments or a judge decides.

What to do next

Frequently asked questions

Do I have to share my tax return every year?

If your income was used to set the child support order, yes. You must give every party your latest tax return and notice of assessment or reassessment no later than 30 days after each anniversary of the order. The parties may agree otherwise.

How often can I ask the other parent for income documents?

On written request, made not more than once a year, a paying parent must provide documents for the three most recent taxation years. The deadline is 30 days, or 60 if the parent lives outside Canada and the United States.

What if the other parent will not share their income?

You may apply to court, which may draw an adverse inference and impute income. Imputing income is an option where a parent has failed to provide income information when legally required.

Will support go up automatically after disclosure?

Disclosure only shares information. Only a judge can change the amount in a support order, though an agreement filed with the court can be recalculated.

Sources

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

This article is general information, not legal advice. Reading it does not create a lawyer-client relationship. Ontario laws, tax rates, and government programs change, and how the law applies depends on your specific facts. For advice about your situation, speak with a licensed Ontario lawyer. Treadstone Law is licensed by the Law Society of Ontario — reach us at 1-844-900-1070 or start a file online.

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