Actually in Alberta any family earning less than $950,000 a year gets a full rebate. I don't know about the rest of Canada, but that is the way it is here.
Carbon rebates
Rebates will be provided to lower- and middle-income Albertans to offset costs associated with the carbon levy. The rebates protect those who spend a higher percentage of their income on energy costs and have fewer financial resources to invest in energy efficiency products.
60% of households will get a full rebate: $200 for an adult, $100 for a spouse and $30 for each child under 18 (up to four children). Single parents can claim the spouse amount for one child, and the child amount for up to 4 more children.
Full rebates will be provided to single Albertans who earn $47,500 or less, and couples and families who earn $95,000 or less. An additional 6% of households will receive a partial rebate.
And here is the full article:
https://www.alberta.ca/climate-carbon-pricing.aspx#p184s2