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Corporation tax forms corrections and changes for 2023 (Articles 9, 9-A, 13, and 33)

The following changes were not reflected on the forms for 2023 when they were published.

If any of the following updates impact a tax form that you are responsible for filing, and you have not yet filed such form, you must incorporate these updates when filing such form.

If you have already filed such form, and one of the following updates affects a calculation previously reported, you must file an amended form reflecting such update.

Select a tax form from the following list to identify the changes affecting that form. If a form is not listed, there have been no changes affecting that form.  


The first sentence containing the Note on page 3 in the 2nd column should read (updated text in bold):

Note: For calendar-year 2024 filers, that Form CT-300 was due March 15, 2024.