law: 20. Failure to deliver returns, etc.-
  If any person fails without reasonable cause to furnish in due time any return under sub-section (2) of section 5, or to produce, or cause to be produced, any accounts or documents required to be produced under section 6, he shall be punishable with fine which may extend to five hundred rupees, and with a further fine which may extend to ten rupees for every day during which the default continues.