How many TD1 forms do I have to fill out?

You have to complete a Federal TD1 for regulatory purposes as prescribed by Revenue Canada if you are earning employment income.

If you are only claiming the basic personal amount for deductions, you are not required to complete a Provincial TD1ON form.

If you are eligible for any other Ontario tax exemptions (e.g. tuition and education amounts, disability amount), you must complete a TD1ON form and submit it to the Payroll office if you want less taxes to be deducted from your pay.