(2)  The total income of each completed previous year or part of any previous year included in such period shall be chargeable to tax at the rate or rates in force in that assessment year, and separate assessments shall be made in respect of each such completed previous year or part of any previous year.

(3)  Any person discontinuing any business or profession shall give to the Assessing Officer notice of such discontinuance within fifteen days thereof.

(3A) Where any business is discontinued in any year, any sum received after the discontinuance shall be deemed to be the income of the recipient and charged to tax accordingly in the year of receipt, if such sum would have been included in the total income of the person who carried on the business had such sum been received before such discontinuance.

(4)  Where any profession is discontinued in any year on account of the cessation of the profession by, or the retirement or death of, the person carrying on the profession, any sum received after the discontinuance shall be deemed to be the income of the recipient and charged to tax accordingly in the year of receipt, if such sum would have been included in the total income of the aforesaid person had it been received before such discontinuance.

(5)  Where an assessment is to be made under the provisions of this section, the Assessing Officer may serve on the person whose income is to be assessed or, in the case of a firm, on any person who was a partner of such firm at the time of its discontinuance or, in the case of a company, on the principal officer thereof, a notice containing all or any of the requirements which may be included in a notice under clause (i) of sub-section (1) of section 142 and the provisions of this Act shall, so far as may be, apply accordingly as if the notice were a notice issued under clause (i) of sub-section (1) of section 142.

(6)  The tax chargeable under this section shall be in addition to the tax, if any, chargeable under any other provision of this Act.

(7)  Where the provisions of sub-section (1) are applicable, any notice issued by the Assessing Officer under clause (i) of sub-section (1) of section 142 or section 148 in respect of any tax chargeable under any other provisions of this Act may, notwithstanding anything contained in clause (i) of sub-section (1) of section 142 or section 148, as the case may be, require the furnishing of the return by the person to whom the aforesaid notices are issued within such period, not being less than seven days, as the Assessing Officer may think proper.