[12A. Interest for default in payment of interest-tax in advance.--(1) Subject to the other provisions of this section, where in any financial year, an assessee, who is liable to pay interest-tax in advance under section 11 has failed to pay such tax, or where the interest-tax paid in advance by such assessee is less than ninety per cent. of the assessed interest-tax, the assessee shall be liable to pay simple interest at the rate of two per cent. for every month or part of a month comprised in the period from the 1st day of April next following such financial year to the date of determination of chargeable interest under sub-section (2) or, as the case may be, sub-section (3) of section 8 on an amount equal to the assessed interest-tax, or, as the case may be, on the amount by which the interest-tax payable in advance falls short of the assessed interest-tax.
Explanation 1.--In this section "assessed interest-tax" means, --
(a) for the purpose of computing the interest payable under section 9, the interest-tax on the chargeable interest as declared in the return referred to in that section;
(b) in any other case, interest-tax on chargeable interest as determined under sub-section (2) or, as the case may be, sub-section (3) of section 8.
Explanation 2.--Where, in relation to an assessment year, an assessment is made for the first time under section 10, the assessment so made shall be regarded as assessment made under sub-section (2) or, as the case may be, sub-section (3) of section 8.
(2) Where, before the date of completion of assessment under sub-section (2) or sub-section (3) of section 8, interest-tax is paid by the assessee under section 9 or otherwise,--
(i) interest shall be calculated in accordance with the foregoing provisions of this section up to the date on which the tax is so paid, and reduced by the interest, if any, paid under section 9 towards the interest chargeable under this section;
(ii) thereafter, interest shall be calculated at the rate aforesaid on the amount by which the tax so paid together with interest-tax paid in advance falls short of the assessed interest-tax.
(3) Where, as a result of an order of reassessment under section 10, the amount on which the interest was payable under sub-section (1) is increased, the assessee shall be liable to pay simple interest at the rate of two per cent. for every month or part of a month comprised in the period commencing on the day following the completion of the assessment under sub-section (2) or, as the case may be, sub-section (3) of section 8 referred to in sub-section (1) and ending on the date of reassessment under section 10, on the amount by which the interest-tax on the basis of the reassessment exceeds the interest-tax on the chargeable interest determined on the basis of assessment under sub-section (2) or, as the case may be, sub-section (3) of section 8.
(4) Where, as a result of an order under section 15 or section 17 of this Act or section 254 or section 260 or section 262 of the Income-tax Act as applicable to this Act by virtue of section 21 of this Act, the amount on which interest was payable under sub-section (1) or sub-section (3) has been increased or reduced, as the case may be, the interest shall be increased or reduced accordingly, and--
(i) in a case where the interest is increased, the Assessing Officer shall serve on the assessee a notice of demand in the prescribed form specifying the sum payable and such notice of demand shall be deemed to be a notice under section 156 of the Income-tax Act as applicable to this Act by virtue of section 21 of this Act, and provisions of this Act shall apply accordingly;
(ii) in a case where the interest is reduced, the excess interest paid, if any, shall be refunded.
(5) The provisions of this section shall apply in respect of assessments for the assessment year commencing on the 1st day of April, 1992 and subsequent assessment years.]