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Yes, Connecticut automatically gives you a 6-month extension to October 15 if you filed an approved federal extension and don't owe taxes on your Connecticut return. Otherwise, either print and mail Form CT-1040 EXT or file your extension online at their TSC online service by April 15. If you owe them taxes, submit payment by April 15 to avoid penalties. You can include a check with your Form CT-1040 EXT or pay online through the TSC online service.
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