(6)Where the specified person, or the principal officer or trustee of such specified person, fails to pay the whole or any part of the tax on the accreted income within the time allowed under sub-section (4), such specified person, principal officer or trustee shall be liable to pay simple interest, computed as per the following formula:––I = 1% of (T*P)where,––I = interest;T = tax on accreted income; and= number of months beginning on the date immediately after the last date on which such tax was payable and ending with the date on which the tax is actually paid including part thereof.