(4)Nothing contained in sections 234B and 234C shall apply to any shortfall in the payment of any tax due on the assessed tax or, as the case may be, returned income where such shortfall is on account of restricting the amount of depreciation allowance or investment allowance under this section and the assessee has paid the amount of shortfall before furnishing the return of income under sub-section (1) of section 139.] [Inserted by Act 36 of 1989, Section 5 (w.e.f. 1.4.1990).]