I would second what Mr. Piragoff has said. Each province determines its own eligibility guidelines. The guidelines always take into account income. They always take into account the capacity of the person to pay and the scope of coverage provided by the legal aid plans.
As you're likely aware, legal aid plans do not provide coverage for all criminal offences. Generally it has to be somewhat more serious, often potentially resulting in the deprivation of liberty. However, the specific cut-offs for each jurisdiction are different. Some legal aid plans, especially with the additional federal contribution now, are able to provide coverage to persons who are at about the low-income measures, which are considered the poverty measures. Others only begin to provide coverage once an individual is perhaps 20% or 30% below that measure.