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Click ‘Get Form’ to open the CT-300 in the editor.
Begin by entering your Employer Identification Number and File Number at the top of the form. This information is crucial for identifying your corporation.
Fill in your Business Telephone Number, State or Country of Incorporation, and select the Return Type required for your filing.
Complete the Tax Subtype and Tax Year Ending fields. Ensure you enter the correct MFI due date to avoid penalties.
In the Computation of MFI section, accurately input figures from previous tax years as instructed. This includes Franchise Tax, MTA Surcharge, and any overpayments credited.
Review all entries for accuracy before signing. The Authorized Person must certify that all information is true and complete.
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Form CT-300, Mandatory First Installment (MFI) of Estimated
Dec 12, 2025 Most corporation taxpayers are required to e-file Form CT-300, Mandatory First Installment (MFI) of Estimated Tax for Corporations.Read more
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