Understand what you need to do to file an estate income tax return and how to get an Employee Identification Number. Search tax forms and instructions.You may be able to file the papers over the Internet using NYSCEF, the New York State Courts Electronic Filing system. Not only do you have to file the decedent's final income taxes, but you will also need to file an income tax return for the estate itself. It might be a good idea to contact a real estate attorney and the tax office to get more information about this. Filing for Administration. New Jersey imposes inheritance taxes on decedent estates at the time of death. This article explains in depth how the inheritance tax may affect you. Many estates will still be subject to state estate taxes and income taxes.