The New York IT-2659 form is an essential document for partnerships and S corporations operating in New York State. It specifically addresses the estimated tax penalties related to underpayment or nonpayment of taxes owed on behalf of partners and shareholders, particularly those who are nonresident individuals or corporations. When filing this form, entities must provide their legal name, trade name, address, and employer identification number. The form requires the completion of several schedules that guide filers through the computation of any penalties incurred due to insufficient estimated tax payments. Notably, the IT-2659 includes a section for detailing the estimated tax owed for the current and prior tax years, along with a method for calculating penalties based on underpayment. Timeliness is crucial, as the form must be filed by April 15 of the following year, or by the due date of the entity's tax return, including any extensions. Filers are advised to include their payment with the form, ensuring that they follow the instructions carefully to avoid additional penalties. Understanding the intricacies of this form can help partnerships and S corporations stay compliant and avoid unnecessary financial burdens.