Personal Tax -> Multiple jobs - too much tax owing
Multiple Jobs - Why Do I Owe so Much Tax?
When payroll deductions are calculated at each of your jobs, your salary or wages for the payroll period are annualized to determine the income tax rate. As a result, you are paying income tax at a rate that assumes you will be earning the same amount per pay period for a year.
If you are working at 2 or more jobs in the same month, and this continues throughout the year, you may owe income taxes at the end of the year. Your payroll tax deductions are determined by the TD1 forms (both federal and provincial/territorial) that you fill out for the employer when you are hired.
Individuals who have more than one employer at the same time cannot claim deductions on more than one TD1 form, unless total income from all employers will be less than the total claim amounts on the TD1 form. See the information on Multiple Jobs in our TD1 form article.
If this is not done properly, tax will be owed when the tax return is filed.
Use the Canadian Tax Calculator for your province or territory to estimate the tax that you will owe at the end of the year.
TaxTips.ca Resources
TD1 Forms Determine Your Tax Withholdings
Tax Tip: It is mandatory to fill out a TD1 form for each employer. Make sure the form is completed correctly.
Revised: October 26, 2023