WebRAS and WinRAS – Calculation of Source Deductions and Employer Contributions

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WebRAS and WinRAS can be used to calculate source deductions and employer contributions for each pay period. However, they do not produce cumulative data for successive pay periods.

Before starting

WebRAS and WinRAS must be used with guide TP-1015.G-V, Guide for Employers: Source Deductions and Contributions. This guide explains how to deduct, remit and report source deductions and employer contributions.


Guide TP-1015.F-V contains the formulas for calculating source deductions of Québec income tax, Québec Pension Plan (QPP) contributions, Québec parental insurance plan (QPIP) premiums and the employer contribution to the health services fund. In the event of a discrepancy between the calculations using the formulas and those using WebRAS or WinRAS, the calculations using the formulas prevail.

Difference between WebRAS and WinRAS

WebRAS 2019-2020-2021

WebRAS can generally be accessed using all recent browsers, regardless of the platform used (Macintosh, Microsoft). For more information, refer to System Requirements. WebRAS performs calculations in exactly the same way as WinRAS does; however, the calculations are more precise in some situations.


  • Modern Web-based input interface
  • Simplicity, speed and accessibility
  • Easy entry of all calculation information
  • Employee record print option

WinRAS 2019-2020-2021

WinRAS is not Macintosh-compatible. The computer must meet the system requirements for installing WinRAS. See How to Install WinRAS for instructions for installing the calcuation tool on your computer.


  • Employee data stored on your computer
  • Import of basic employee information into a subsequent version of WinRAS

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