To amend the Internal Revenue Code of 1986 to require disclosure of lobbying activities by certain organizations.

Stealth Lobbyist Disclosure Act of 2005 - Amends the Internal Revenue Code to treat as a tax-exempt political organization for purposes of the disclosure and other requirements applicable to such organizations (with certain modifications) any coalition or association that is identified as a client on any registration filed under the Lobbying Disclosure Act of 1995 and that is not a political...