Follow the steps to complete your form efficiently.

1. Press the ‘Get Form’ button to access and open the CT-1065/CT-1120SI form for filling out.
2. Enter the income year that corresponds with the period you are reporting. Fill in both the beginning and ending dates in the designated fields.
3. Complete the section labeled 'Name of pass-through entity' with your entity's official name, and provide the corresponding city, town, or post office, state, and ZIP code.
4. Input your Federal Employer Identification Number (FEIN) and Connecticut Tax Registration Number in the appropriate fields.
5. Select the type of pass-through entity by checking the appropriate box for Limited liability partnership (LLP), Limited partnership (LP), S corporation, Partnership (LLC treated as a partnership), or General partnership (GP).
6. Indicate the return type by checking whether it is a final return, short period return, or amended return. If it is amended, specify the reason.
7. Complete the income computation section by entering values in the designated lines for income or loss subject to tax. Ensure totals are calculated accurately.
8. If applicable, select the filing method. Choose between the Standard Base or Alternative Base, and if the combined election is made, fill in additional required details.
9. Proceed to sign the declaration as the authorized person, input the date, and provide contact information such as phone number and email address.
10. Once all fields are accurately filled, you may choose to save changes, download, print, or share the form as necessary.

Complete your CT-1065/CT-1120SI form online today to ensure timely and accurate filing.