If you did a study on the people paying taxes as individuals or against business incomes, a majority of them would want to be honest tax payers. They would submit their income returns disclosing all that they have earned and pay the taxes due as per law. But in spite of this, the tax administrators do pick a few accounts for investigation. There is no wrong intention on the part of the revenue authorities in ordering an investigation. They are doing their job. And the processes have also been made more transparent now with the computers picking the persons or companies to be investigated. So you will never know if and when your name could get picked. The safest way is to take an insurance against tax investigation and stop worrying about it.