TLDR: Canada (Toronto in this ex) has much lower salaries, higher taxes, worse weather, but lower one bdrm rents.

According to goog, Boston is comparable to Toronto so...

Soft dev average salary in: . Toronto: 60k USD (77 CAD) [0] . Boston: 106 USD [1]

[0] https://www.glassdoor.ca/Salaries/toronto-software-developer... [1] https://www.glassdoor.ca/Salaries/boston-software-engineer-s...

Post tax income: . Toronto: 42.5k USD (54.7k CAD) [0.1] . Mass: 70.4k [1.1]

[0.1] https://ca.talent.com/tax-calculator/Ontario-77000 [1.1] https://smartasset.com/taxes/massachusetts-tax-calculator#er...

Median rent for studio: . Toronto: 2k CAD/month [2] . Boston: 2.5k USD/month [3]

[2] https://www.zumper.com/rent-research/toronto-on [3] https://www.zumper.com/rent-research/boston-ma