I don't think Delaware has a corporate tax. That is why most corporations register its charter in Delaware because they don't have a tax. You pay State taxes in all states that you have nexus in. This would be New York.
Selected Entity Name: ATRINSIC, INC. Selected Entity Status Information Current Entity Name: ATRINSIC, INC. Initial DOS Filing Date: DECEMBER 18, 2008 County: NEW YORK Jurisdiction: DELAWARE Entity Type: FOREIGN BUSINESS CORPORATION Current Entity Status: ACTIVE
They registered it's corporate charter in Delaware but would pay corp taxes to the State of NY and apportion it's income between all other states that they have nexus with.