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Tax on split income (TOSI)

Tax on split income, or TOSI, is a special federal tax that applies to certain income received from a related business. It generally applies when a specified individual has split income that is not an excluded amount, and it can reach private-company dividends paid to family members.

The CRA’s page on tax on split income points readers to its guidance on income sprinkling. The tax is relevant where a family company pays dividends to a spouse or other family member, and to a buyer reviewing how the seller was paid.

How it works

The CRA says you are generally subject to the tax if you are a specified individual and have split income in the year that is not an excluded amount. Split income includes taxable dividends on shares of a corporation, other than shares of a class listed on a designated stock exchange or of a mutual fund corporation, and shareholder benefits. Excluded amounts include income not derived from a related business, and income from an excluded business. Section 120.4 of the Act sets the rules; it defines an excluded business as one in which the individual is actively engaged on a regular, continuous and substantial basis, in the year or in any five prior taxation years.

What to ask

  • Which family members received dividends, and from which class of shares
  • Whether the accountant concluded an excluded amount applied, and on what facts
  • Whether a family trust was involved

See how discretionary family trusts are used in succession.

Sources

This definition is checked against primary sources. Links were last confirmed on the dates shown.

  1. 01
    Canada Revenue AgencyGovernment
    Line 40424 – Federal tax on split income
    canada.ca·Checked Oct 24, 2026
  2. 02
    Government of CanadaGovernment
    Income Tax Act, R.S.C. 1985, c. 1 (5th Supp.)
    laws-lois.justice.gc.ca·Checked Oct 1, 2026

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