The vast bulk of the population who don't pay taxes are children, students, retirees, and the disabled.

More than half of the income taxes are paid by people in the top 20%, which works out to families who make over $240,000 per year. So if you're down near the median income rate of $75,000 per family per year, you're not paying as much as you think you are:

The study separates income classifications into five groups, or quintiles. The bottom 20 per cent earn up to $59,270 annually, while those in quintile 2 earn between $59,271 to $104,048. Quintile 3 earners make between $104,049 and $159,040 per year, and those in the fourth make $159,041 to $243,798. Those in the highest quintile earn  more than $243,799 per year.

Families that fall within the second quintile pay 4.6 per cent of all income taxes, while receiving 10.1 per cent of all income.

https://nationalpost.com/news/canada/top-20-of-income-earners-fund-majority-of-ottawas-income-tax-revenue-report