Final answer:
The CCB boundary for no taxback is $30,000. The taxback rate is 7% for income above $60,000 and 3.2% for income above $80,000.
Step-by-step explanation:
The CCB (Canada Child Benefit) boundary for no taxback is $30,000. This means that if a family's income is below $30,000, they will not have to pay any taxes back.
The taxback rate of 7% applies when a family's income is above $60,000. This means that the family will have to pay back 7% of their income above that amount.
The taxback rate of 3.2% is applicable when a family's income exceeds $80,000. In this case, the family will have to pay back 3.2% of their income above $80,000.