Ad valorem penalties.
Section 131
SEC. 131. Ad valorem penalties.—In case of any failure to make and file a return within the time prescribed in subsection (b) of section 125 or by the Commissioner, there shall be added to the tax twenty-five per centum of ]ts amount, except that, when a return is voluntarily without notice from the Commissioner filed after such and if it is shown that the failure to file it was due to a reasonable cause and not to willful neglect, no such addition shall be made to the tax. In case a false or fraudulent return is willfully made, there shall be added :to the tax or to the deficiency tax, in case any payment has been made on the basis of such return before the discovery of the falsity or fraud, a surcharge of fifty per centum of its amount. The amount so added to any tax shall be collected at the same time and in the same manner and as a part of the tax unless the tax has been paid before the discovery of the neglect, falsity, or fraud, in which case the amount so added shall be collected in the same manner as the tax.