(c) Reasonable cause exception
No penalty shall be imposed under this section with respect to any failure if it is shown that such failure is due to reasonable cause.
(Added Pub. L. 108–357, title VIII, § 863(c)(1), Oct. 22, 2004, 118 Stat. 1620; amended Pub. L. 109–59, title XI, § 11164(b)(1), Aug. 10, 2005, 119 Stat. 1975.)