N.Y.C. Admin. Code § 19-547: § 19-547 Gratuity.

a. Any for-hire vehicle base, or dispatch service provider operating on behalf of such a base, shall provide a means to allow passengers to provide drivers with a gratuity using the same method of payment passengers use to pay for the fare. If a for-hire vehicle base, or dispatch service provider operating on behalf of such a base, allows passengers to book and pay for a trip through a website, smartphone application, or any other passenger-facing booking tool, such website, smartphone application, or passenger-facing booking tool must provide passengers with preset gratuity options set according to the for-hire vehicle base's discretion, but that include at least one option that is at least 20 percent of the fare, and permit passengers to manually enter another gratuity amount or percentage at the passengers' option. A for-hire vehicle base must remit to the driver the entirety of anything designated as a gratuity collected by such base from the passenger on behalf of the driver.

b. Any for-hire vehicle base, or dispatch service provider operating on behalf of such a base, that has been found to have violated any provision of this section shall be subject to a civil penalty of not less than $250 nor more than $500 for each offense.

(L.L. 2017/135, 8/8/2017, eff. 11/6/2017)