I'm a salon owner. I recently rented one of chairs and need to learn how to calculate EI for her. How do I do that?

Hi YoHairShop

The article linked here from the government of Canada outlines the specifics.

https://www.canada.ca/en/revenue-agency/services/tax/canada-pension-plan-cpp-employment-insurance-ei-rulings/cpp-ei-explained/canada-pension-plan-employment-insurance-explained.html 

If you scroll just a little over halfway down the page, it talks about EI calculations there.

Hope this helps!