Ct 3a instructions 2026

1. Click ‘Get Form’ to open the CT-3-A instructions in the editor.
2. Begin by entering your corporation's identifying information, including the Employer Identification Number (EIN) and current address in the designated fields.
3. In Part 1, provide general corporate information. Ensure all boxes are marked accurately to avoid processing delays.
4. Proceed to Part 2, where you will compute any balance due or overpayment. Follow the line instructions carefully for accurate calculations.
5. For Part 3, calculate the tax on combined business income base. Enter all required figures as positive numbers and ensure proper sourcing of income.
6. Complete Parts 4 through 7 by following specific instructions for each section, ensuring that all necessary forms are attached as required.

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