Speak with the Secretary of State's office or investigate online to learn if your state permits LLPs to be formed. If it does, learn the specifics of the process, including all required documents -- like articles of organization -- and state forms that must be filed. If LLPs are legal, learn what type businesses are eligible for LLP formation. Many states restrict the business types that are allowed.
Pick a name for your LLP that is permitted by your state. You will not be allowed to duplicate the name of another LLP registered in your state. Even deceptively similar names are usually prohibited by your state regulations to avoid confusing or trading on the name and goodwill of another LLP.
File for and receive a federal EIN, or Employer Identification Number, from the IRS. While you have four choices to get your EIN -- online, telephone, fax, and mail -- the fastest way is to complete the online form, as you will receive your EIN immediately (see Resources).
Design and write a partnership agreement. While forming an LLC gives you some choices for structure, an LLP requires a partnership agreement that is the official structure document from which all other issues proceed. Keep in mind that some states only allow professionals to form LLPs. For example, some states restrict LLPs to accountants, medical doctors, architects, engineers and lawyers. All other businesses that want to have limited liability for owners must form LLCs.
Pay all registration fees required by your state to file for an LLP. Don't forget to apply for any required licenses you and your partners may be lacking. While all partners are probably licensed in professional LLPs, should any licenses not be up to date, or should one or more partners be new state residents, they may need to apply for permission to practice in your state.