This article is worth reading in full, re: Canada and the net economic effects of immigration

https://williamgairdner.ca/is-the-economy-a-good-reason-for-immigration/

To conclude: a recent study by economist Herbert Grubel of Simon Fraser University revealed that the 2.5 million immigrants who came to Canada between 1990 and 2002 received $18.3 billion more in government services and benefits in the year 2002 alone than they paid in taxes for that year! Grubel stated that this amount was more than the federal government contributed to health care in 2000-2001, and more than twice what it spent on defence.