time as, and as a part of, such installment. The part of the deficiency so prorated to any installment the date for payment of which has arrived shall be paid upon notice and demand from the Secretary. This subsection shall not apply if the deficiency is due to negligence, to intentional disregard of rules and regulations, or to fraud with intent to evade tax. (f) Time for payment of interest If the time for payment of any amount of tax has been extended under this section, interest payable under section 6601 on any unpaid portion shall be paid annually at the same time as, and as part of, each installment payment of the tax. (g) Regulations The Secretary shall prescribe such regulations as may be necessary to the application of this section. (h) Cross References (1) Security For authority of the Secretary to require security in the case of an extension under this section, see section 6165. (2) Interest For provisions relating to interest on tax payable in installments under this section, see subsection (k) of section 6601. . (2) Clerical amendment The table of sections for subpart B of chapter 62 is amended by adding at the end the following new item: Sec. 6168. Extension of time for payment of capital gains on certain assets realized by reason of death. . (b) Interest Section 6601 of the Internal Revenue Code of 1986 is amended by redesignating subsection (k) as subsection (l) and by inserting after subsection (j) the following new subsection: (k) Special rate for tax extended under section 6168 If the time for payment of an amount of tax imposed by chapter 11 is extended as provided in section 6168, in lieu of the annual rate provided by subsection (a), interest shall be paid at a rate equal to 45 percent of the annual rate provided by subsection (a). For purposes of this subsection, the amount of any deficiency which is prorated to installments payable under section 6168 shall be treated as an amount of tax payable in installments under such section. . 215. Waiver of penalty for underpayment of estimated tax