No later than 45 days after a lobbyist first makes a lobbying contact or is employed or retained to make a lobbying contact, whichever is earlier, or on the first business day after such 45th day if the 45th day is not a business day, such lobbyist (or, as provided under paragraph (2), the organization employing such lobbyist), shall register with the Secretary of the Senate and the Clerk of the House of Representatives.
Any organization that has 1 or more employees who are lobbyists shall file a single registration under this section on behalf of such employees for each client on whose behalf the employees act as lobbyists.
(as estimated under section 1604 of this title) in the quarterly period described in section 1604(a) of this title during which the registration would be made is not required to register under this subsection with respect to such client.
In the case of a registrant making lobbying contacts on behalf of more than 1 client, a separate registration under this section shall be filed for each such client.
A registrant who makes more than 1 lobbying contact for the same client shall file a single registration covering all such lobbying contacts.