In this case, the “ON” in “TD1ON” stands for Ontario. Provincial and federal tax rates are published on the official website of the government of Canada. Allowances for Ontario are stipulated in the TD1ON form itself (forms published for different years have different tax allowances)...
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There are two types of TD1 forms: a generic federal TD1 form that all Canadian employees must fill out, and provincial forms that relate to the tax allowances of specific territories, such as a TD1ON for Ontario. Employees need to fill out both federal and provincial forms. You should ...