Traditionally the discount for cash in many professions is due to avoiding tax.
i.e. a plumber will do a job for cheaper if they are paid in cash as they won't be declaring that work in their accounts - avoiding the ~20% tax that would be due otherwise.
i.e. a plumber will do a job for cheaper if they are paid in cash as they won't be declaring that work in their accounts - avoiding the ~20% tax that would be due otherwise.