Business Registration Form. A "Sole Proprietorship" or "General Partnership" seeking to operate in the County of Middlesex must file a Certificate of Trade Name with the County Clerk.Taxpayers should use these forms and guides to apply for local tax abatements and exemptions and file property returns. This form is for general instructions that apply to all corporation tax forms. It includes a variety of topics about how to fill out your form. Use the free New Jersey Online Filing Service to file your 2024 NJ-1040 return. It's simple and easy to follow the instructions, complete your NJ tax return,. Many standard forms are available below. All forms are categorized into their respective departments. This packet contains information and forms you will need to register your business with the Division of Revenue and.