Most art grants you get a T4A. If you get a $15,000 grant but have $13500 in expenses for paying people, materials etc…, does CPP look at the T4A amount or after expenses with net amount of $1500 for the disabled individual?
Welcome to the forum. 
I don’t understand the question.
Is it “does CPP look at company income or private income”?
Do you get a T4A for an art grant for a person or is it for a business (business number)?
I don’t know the answer to your question, sorry.
I would phone Service Canada.