Form TD1ON is used by Ontario residents to inform employers of the correct amount of income tax to deduct from their earnings. It allows individuals to claim personal tax credits, which can reduce the amount of tax withheld from their pay. Proper completion of this form helps ensure accurate tax withholding.

Individuals employed or receiving pensions in Ontario who need to adjust their tax credits.

No, a new form is only necessary if there are changes to your tax credit amounts.

You need to complete both the federal TD1 form and the provincial TD1ON form.

You must submit a new TD1ON form to your employer as soon as possible after the change.