Section 28
SEC. 28. Section 130 of the National Internal Revenue Code is hereby amended to read as follows: “Sec. 130. Additions to the tax in case of nonpayment. “(a) Tax shown on the return. “(1) Payment not extended. Where the amount of the tax determined by the donor as the tax or any part of such amount is not paid on the due date of the tax, there shall be collected as part of the tax, interest upon such unpaid amount at the rate of twenty per centum per annum, from the due date until it is paid: Provided, That the maximum amount that may be collected as interest on delinquency shall in no case exceed the amount corresponding to a period of three years, the present provisions regarding prescription to the contrary notwithstanding.” “(2) Payment extended. Where an extension of the time for payment of the amount so determined as the tax by the donor has been granted, and the amount, the time for the payment of which has been extended and the interest thereon determined under subsection (a) of this Section 128 is not paid in full prior to the expiration of the period of the extension, interest at the rate of twenty per centum per annum, shall be collected on such unpaid amount from the date the same was originally due until it is paid. “(b) Deficiency. “(1) Payment not extended. Where a deficiency, or any interest assessed in connection therewith, or any addition to the tax provided for in Section 131 is not paid in full within thirty days from the date of the notice and demand from the Commissioner, there shall be collected as part of the tax, interest upon the unpaid amount at the rate of twenty per centum per annum, from the date of such notice and demand until it is paid: Provided, That the maximum amount that may be collected as interest on delinquency shall in no case exceed the amount corresponding to a period of three years, the present provisions regarding prescription to the contrary notwithstanding. “(2) Payment extended. If any part of the deficiency the time for payment of which is extended is not paid in accordance with the terms of the extension, there shall be collected, as a part of the tax, interest on such unpaid amount at the rate of twenty per centum per annum, from the date the same was originally due until it is paid. “(c) Surcharge. If any amount of tax shown on the return by the donor is not paid in full on or before the date prescribed for its payment under paragraph (a) of this section, or any amount of deficiency, or any interest assessed in connection therewith is not paid in full within the period prescribed in the assessment notice and demand required under paragraph (b) of this section, there shall be collected in addition to the interest prescribed herein and in Sections 128 and 129 and as part of the tax a surcharge of ten per centum of the unpaid amount.”