Accounts Payable / Payroll Associate

Mississauga, ON

About Us

Trillium Therapeutics Inc. is a clinical stage immuno-oncology company developing innovative therapies for the treatment of cancer. We employ biologic and small molecule-based approaches that enhance the ability of the patient’s own immune system to detect and destroy cancer cells. Located in Mississauga, Trillium offers a diverse and inclusive workplace, and offers market leading employee benefits.

Job Purpose

The Accounts Payable/ Payroll Associate has an important role on the Finance team to ensure approved vendors and employees are paid accurately and timely. Adherence to well documented control procedures is critical in this role due to public company reporting requirements. The incumbent must be highly detailed oriented and able to demonstrate a consistently high quality of performance.

Key Accountabilities

Accounts Payable

  • New vendor set-up and verification, including maintenance of purchase order template
  • Matching invoices to purchase orders and packing documents, and obtaining invoice approvals
  • Verification of employee reimbursement expenses before processing and maintenance of employee expense report template
  • Enter and upload invoices into the accounting system ensuring correct approval and coding
  • Initiating vendor payments and recording payment journal entries
  • Sending payment verifications to vendors
  • Coordinate with vendors to investigate and reconcile invoices or payments under dispute
  • Resolution of vendor enquiries in a timely and professional manner, acting as a liaison between vendor contacts and R&D personnel
  • Ensure integrity and accuracy of vendor information in accounting system and periodic review of inactive vendors
  • Filing and performing related administrative duties as assigned


  • Canadian and U.S. payroll processing
  • Reconcile payroll ledgers to T4, general ledger, benefit tracking sheets
  • Prepare T4, T4A-NR slips, EHT and WSIB reconciliations
  • Calculate and make remittances for US consultants, employees, and directors’ work in Canada
  • Preparation and recording of journal entries for month end and quarter end close including tax filings, monthly withholding taxes, quarterly HST filings, and annual tax reconciliations
  • Timesheet and vacation tracking
  • Monthly WSIB premium reporting and annual reconciliation


  • Assistance with monthly and quarterly financial statement reporting, including:
    – Monthly bank reconciliations for CAD and USD bank accounts
    – Quarterly invoice accruals and review of open purchase orders
  • Quarterly HST filing and compliance
  • Assist with tracking of all agreements and contract index maintenance
  • Implement process improvements to accounting processes and procedures to increase efficiency and effectiveness
  • Undertaking special projects and other Finance group duties as needed

Required Qualifications and Skills

  • Degree in Accounting or Finance obtained within the last 2 years (no other majors accepted)
  • High level of accuracy (attention to detail), efficiency, and accountability
  • Very high competence in Microsoft Excel
  • Strong math, typing, and computer/software skills
  • Excellent communication, research, problem solving, and time management skills

How to Apply

Please send your resume and cover letter to with the title of the role in the subject line. Kindly note that phone calls and third parties are not accepted.