Section 2(12A) of Income Tax Act

As perIncome Tax Act 1961 there is no condition to maintain to maintain the books of accounts and that too in hard copy. None of the section puts this binding on the assesse.

Sec 148 of the Act have the power to reopen the books of accounts of assessee upto previous six years, therefore as a customary act the books of accounts are maintained.

There is only a condition under companies act in sec 209 which bind companies to maintain its records and keep its books of accounts(not essential in hard copy)and that too for not less than eight years.

Sec 2(12) of Income Tax Act only defines the word Book or books of accounts used in the act, to avoid all confusions and does not stand strict to maintain any books.

Hope this will help you out.