You could ask your chair to swap your pay with that of your sessionals. They don't have most of these deductions taken from their paycheque. Trust me it's a bargain.
You all have no idea how expensive is Canada. Not only is your marginal tax high, you pay for disability, life, health, dental insurance and union dues coupled with EI, CPP, WSIB. Then there is pension deduction. Also, you do not get to deduct mortgage interest from taxes. This along with insanely high property prices an property taxes and everything being so expensive ( check out restaurants after minimum wage hike in Ontario). Did I forget 13% sales tax and the horrible weather.
LOL.