(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.