Follow the steps to complete your form accurately.

1. Click the ‘Get Form’ button to obtain the form and open it in the designated editor.
2. Enter the name of the pass-through entity (PE) and the Federal Employer Identification Number (FEIN) in the appropriate fields.
3. Fill in the number and street address, PO Box (if applicable), and the Connecticut Tax Registration Number.
4. Complete the city, town, or post office, state, and ZIP code fields.
5. Select the type of pass-through entity by checking the corresponding box for Limited Liability Partnership (LLP), Limited Partnership (LP), General Partnership (GP), S Corporation, or Partnership (LLC treated as a partnership).
6. Request a six-month extension by selecting the appropriate date, September 15, or specifying another taxable year ending date.
7. Indicate if a federal extension has been requested by checking the box and providing the necessary dates.
8. Complete Line 1 by estimating the 2020 tax liability, entering an amount or '0' if no tax is due.
9. Fill out Line 2 with the total estimated payments made during the taxable year and any overpayment applied from the previous year.
10. Calculate the amount due by subtracting Line 2 from Line 1 and enter the result in Line 3. If this amount is less than zero, enter '0.'
11. Sign and date the declaration section, ensuring it is completed by a general partner or corporate officer.
12. Provide the telephone number and preparer's identification if applicable.
13. Review all entered information for accuracy before submission.
14. At the end, save changes, download, print, or share the form as needed.

Complete your CT DRS CT-1065/CT-1120SI EXT form online to ensure timely and accurate submission.