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The CT1120SI-ES is a Connecticut Corporation Business Tax Estimated Payment Coupon.
Corporations in Connecticut that are subject to the Corporation Business Tax are required to file CT1120SI-ES.
CT1120SI-ES can be filled out manually or through the Connecticut Department of Revenue Services online portal.
The purpose of CT1120SI-ES is to allow corporations to make estimated tax payments throughout the year.
CT1120SI-ES requires corporations to report their estimated tax payments for the year.
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