A person who is required to report a tax imposed by this chapter and fails to report as required by Sections 122.102 and 122.103 shall pay:
(1) a penalty of five percent of the amount of the tax due with the report; and
(2) if the report is not made before the 31st day after the date the report is initially required to be made, an additional penalty of five percent of the amount of the tax due with the report.
Official text of the Texas Utilities Code as published by the Texas Legislative Council.