(CAN) self employed sub contractor. received a bonus for referral of another sub contractor. remove taxes or not?

Hi everyone,

I'm a massage therapist in BC Canada.

I referred another massage therapist to my clinic (we are all self employed and split our income with the clinic) and because he stayed longer than X# of months I get to receive 500$ CAD.

Usually with every paycheck i remove 25% of my pay and put it into income tax. Does a bonus count as that or is it separate because its a bonus?

Tl:DR. do i remove income tax from my $500.00 bonus or do I keep it all?

Thank you very much!