While the detailing is hobbyish , I ' d call it a moral grey area . If you go fulltime , absolutely do it right . I thought this note was quite clear . I would never turn in a person for tax evasion of this type . I am against tax evasion as a whole . But , don ' t kid yourself , this is a rampant industry . Just because you and I are honest in our income tax declarations , it ' s not universally a revered practice . Have you ever looked at cash businesses for sale ? They will often want to be paid for their offthebooks revenue . These types of businesses often draw the interest of tax dodgers and in some cases , and IMO the pricemultiples skew higher than one would think is reasonable . Did you know that the IRS has formulas that allow them to reverse engineer revenue of laundromats thru electricity use ? I have a friend in Canada that is an undercover revenue agent who visits stripclubs and bars counting customers and drinks served in an effort to deduce the true income ? Did you know that AL Capon didn ' t pay taxes ? It ' s been a thing for many years . It is still a thing today . And , it ' s millions of people , not thousands . This is why a flat tax would be way more efficient at collecting as it targets consumption , not revenue . But , then the tax evasion game moves to new players . Sigh .