Follow the steps to successfully fill out the form online.

1. Press the ‘Get Form’ button to obtain the NY IT-2105-I form and open it in your preferred editor.
2. Begin by entering your full name and mailing address in the designated spaces on the form.
3. Provide your Social Security number or taxpayer identification number; ensure this information matches your previous tax return to avoid issues.
4. If applicable, enter the special condition code 'D9' if you qualify for a 90-day extension due to the death of a spouse within 30 days of the payment due date.
5. Fill in the estimated tax amounts due for New York State, New York City, Yonkers, and MCTMT, ensuring each figure is rounded to the nearest dollar.
6. If you are applying any overpayment from the previous year to your estimated tax for 2025, detail the amount in the appropriate section.
7. Review all entries for accuracy, ensuring that your figures align with your calculations on the estimated tax worksheet.
8. Once completed, you can save your changes, download a copy of the form, print it, or share it as needed.

Complete your documents online to ensure timely and efficient filing.