From the Canada Revenue Agency’s “Employers’ Guide Payroll Deductions and Remittances T4001(E) Rev.15” :
You should advise part-time employees that it could be beneficial to have more income tax deducted from the remuneration they receive. In this way, they can avoid having to pay a large amount of tax when they file their income tax and benefit returns, especially if they have worked part-time for different employers during the year.
Because i) God forbid people with multiple part-time jobs realise just how badly they’re being fisted by the theftocratic buttchuggers in Ottawa when they have to pay the whole lump sum of their “fair share” all at once in April, ii) God forbid that an employee earns interest, however modest in these hyperinflationary times, or makes an investment using their hard-earned monies before the taxman cometh, and iii) God forbid the CRA can actually be bothered to come up with an explanation other than “reasons.”
Fucking cunts.