N.Y. Legis. Law § 1-G
Upon the termination of a lobbyist's retainer, employment or designation, such lobbyist and the client on whose behalf such service has been rendered shall both give written notice to the commission within thirty days after the lobbyist ceases the activity that required such lobbyist to file a statement of registration; however, such lobbyist shall nevertheless comply with the bi-monthly reporting requirements up to the date such activity has ceased as required by this article and both such parties shall each file the semi-annual report required by section one-j of this article. The commission shall enter notice of such termination in the appropriate monthly registration docket required by section one-f of this article.
N.Y. Legis. Law § 1-G