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Corporation Tax Web File

E-file options

Most taxpayers are mandated to electronically file the following corporation tax forms. You can Web File your return directly from your Business Online Services account—for free—or e-file using New York State-approved commercial software, if you prefer.  

Forms you can Web File or e-file

  • CT-300, Mandatory First Installment (MFI) of Estimated Tax for Corporations
  • CT-400, Estimated Tax for Corporations
  • CT-5, Request for Six-Month Extension to File (franchise/business taxes, MTA surcharge, or both)
  • CT-5.3, Request for Six-Month Extension to File (for combined franchise or combined MTA surcharge return, or both)
  • CT-5.4, Request for Six-Month Extension to File New York S Corporation Franchise Tax Return
  • CT-5.6, Request for Three-Month Extension to File Form CT-186 (for utility corporation franchise tax return, MTA surcharge return or both)
  • CT-5.9, Request for Three-Month Extension to File (for Article 9 tax return, MTA surcharge, or both)
  • CT-5.9-E, Request for Three-Month Extension to File Form CT-186-E or Form CT-186-EZ (short form)

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Forms you can only e-file

  • CT-5.1, Request for Additional Extension of Time to File

Payment options available with Web File

ACH debit—pay directly from your bank account

  1. Provide your bank routing and account number when you electronically file.
  2. Submit the transaction before midnight on the due date, to ensure your ACH debit payment is timely.
  3. The payment will be paid directly from your checking or savings account.

ACH credit—initiate an electronic credit transfer through your financial institution or bank

Note: You must still file your form even if you are paying by ACH credit.

  1. Report the balance due and indicate a payment amount of zero when you electronically file.
  2. Initiate a ACH credit payment through your financial institution or bank prior to the due date, to ensure it has enough time to submit your payment timely.
    • Note: You should contact your bank to learn:
      • whether you need special software to make an ACH credit payment; and
      • its specific deadlines for submitting an ACH credit payment by your due date.
  3. Your financial institution or bank will electronically send your payment to the Tax Department.

See ACH credit format specifications for instructions about how to properly format your payment information.