T4 and T4A Slips

T4 and T4A Slips are Now Available Electronically 

This year, McMaster Human Resources Services is offering individuals secure electronic access to their T4 and T4A slips for payments made through HR payroll.

Current employees who consent to electronic delivery will access their tax slips through Mosaic Human Resources Self Service, similar to how pay statements are now accessible to all employees.

To submit your consent to receive online tax slips:

  • Use the drop down on your Mosaic Home page and select the Employee Self Service option
  • Click on the “Opt for Electronic T4/T4A Slip” tile to provide your consent 

To view your electronic tax slip on Mosaic:

  • Use the drop down on your Mosaic Home page and select the Employee Self Service option
  • Click on the “View T4/T4A Slips” tile to download your electronic T4/T4A Slip 

For those employees who do not give consent, a paper copy will be issued by February 27, 2018, in accordance with the annual deadlines set by the Canada Revenue Agency.

Replacement slips are subject to a $5 administrative fee per slip. This fee is payable through payroll deduction, personal cheque or money order. For payments via payroll deduction (available to current employees only), please provide written authorization in your email request.

Original tax slips returned to McMaster University by Canada Post will be re-directed at no charge if an updated address has been provided to Human Resources.

Issue of replacements for lost slips will begin after March 12, 2018 to allow time for Canada Post returns. Please allow 5 business days for processing your request.

If a replacement is required for any reason, please forward your request to your Human Resources Representative, along with your current full mailing address.

For more information on the Opt In for Online, click here.

Review your tax deductions

The beginning of a New Year is a great time for all employees to consider reviewing their personal tax declarations. Your tax exemptions are displayed in the upper right corner of your pay statement.

Why should I review my Declarations?

One or more factors might prompt an individual to submit an updated tax declaration to their employer:

  • Change in Marital Status
  • Children welcomed into your family, or progressing to adulthood
  • Entering into, or completing, a program of study
  • Moving between part-time employment and full-time employment
  • Beginning or ending paid employment with multiple employer(s)

When does the Canada Revenue Agency require me to submit a new Declaration?

The Canada Revenue Agency (CRA) does not require each individual to submit a new TD1 form to their employer each year. However, they recommend that each individual who declares more than the Basic Exemption Amount review their tax exemption declarations at the beginning of each calendar year.

Whenever an individual's applicable tax exemptions change, the CRA requires an employee to submit a new TD1 form (and a TD1-ON form as well, if above Basic Declaration amounts) to their employer within 7 days, to help ensure there are no negative impacts on the individual at tax time.

If I am receiving two pay statements each pay, what do I need to know?

McMaster issues multiple pay statements for a limited number of employees who hold multiple jobs at McMaster. The majority of employees still have a single pay statement each pay. This is due to the way PeopleSoft stores Year-to-Date values when corporate EI rates differ, in support of the Canada Revenue Agency's requirement to report these on separate tax slips.

For example, an employee who holds both a Teaching Assistant position and a Casual worker would still see a single pay statement. However, an employee who holds both a position covered by the collective agreement with UNIFOR and a Casual position would see two statements, as would an employee in the TMG group who is also a Part-Time Instructor.

Payroll systems treat each paycheque separately when calculating income tax, so employees who are now receiving multiple statements for the same pay period may have seen a reduction in the total income tax being deducted across the two statements, to a greater or lesser degree.

All employees who are now receiving multiple statements are strongly encouraged to review their 2017 pay statement tax deductions, and to submit revised TD1 and TD1-ON forms for 2018 if they determine that their tax exemption declarations require any change.

Where can I access the TD1 and TD1-ON forms?

Links to the Canada Revenue Agency's 2018 Tax Exemption Declaration forms can be found online:


What should I do with my completed forms?

Completed, dated, and signed TD1 and TD1-ON forms are submitted to the HR Office supporting your area:

  • HR Service Centre, CSB 202
  • Faculty of Health Sciences HR Office, HSC-2J1A

If you have any questions regarding submitting your completed TD1 and TD1-ON forms, please contact your Human Resources Representative.