(1) Every person liable to pay any tax under this Act, shall, within a period of six months from the beginning of the financial year, furnish to such authority, containing such particulars and in such manner as may be prescribed, an annual return of tax payable by him.
(2) Before any person furnishes the return required by sub-section
(1) he shall, in the prescribed manner, pay into a treasury or the Reserve Bank of India the full amount of tax or taxes due from him under this Act according to such return.
(3) If any person discovers any omission or other error in any return furnished by him, he shall at any time before the date due for furnishing the next return furnish a revised return and shall, before he files the revised return, pay in the prescribed manner into a Treasury or the Reserve Bank of India the excess amount of tax, if any, which was due from him than was shown in the original return.
(4) For the purpose of determining the amount of land tax or urban land tax the extent of retained land or land occupied by any building with land appurtenant thereto, as the case may be, as on the first day of April of the financial year to which the return relates, shall be the basis.
13. If any person fails to furnish the return under section 12, the Commissioner may obtain the necessary information either by himself or through such agency as he thinks fit.