Qualifying Delaware LLC in New York
How to quality a Delaware LLC as foreign entity in New York State?
Anna,
You can apply to have your Delaware LLC filed as a foreign entity in New York here, where you would see all the procedures and costs listed upfront.
While you will not need a new EIN for the business or business bank account, if your business requires any specific licenses, for example a state sales/use permit or commercial license, you would need to obtain those in New York as well.