(a) Imposition of penalty 
If an organization fails to meet the disclosure requirement of section 6115 with respect to a quid pro quo contribution, such organization shall pay a penalty of $10 for each contribution in respect of which the organization fails to make the required disclosure, except that the total penalty imposed by this subsection with respect to a particular fundraising" target="_blank" title="fundraising">fundraising event or mailing shall not exceed $5,000.

(b) 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.