Start an Arizona LLP — A Step-by-Step Registration Guide

Before anything is filed, your LLP needs a name that is available and that meets Arizona's naming rules. Because an LLP starts as a general partnership, many firms already operate under a name — but that name still has to clear the state's distinguishability standard and carry the correct designator once you register.

Check availability first

Search the Arizona Secretary of State's business name records to confirm nothing already on file is confusingly similar. A name that differs only by punctuation, spacing, or filler words like "the" or "and" may not be treated as distinguishable, and a conflict can slow or block your registration.

The LLP designator

An Arizona limited liability partnership must signal its status in its name. That generally means the name includes a phrase or abbreviation such as "Limited Liability Partnership," "L.L.P.," or "LLP." This designator is what tells the public — and your firm's counterparties — that the partners carry the LLP shield rather than the unlimited liability of a plain general partnership. Do not skip it.

Names for licensed practices

Professional firms should check both the Secretary of State's rules and their licensing board's requirements. Some boards restrict how a practice may be named or require particular language. Sorting this out before you register avoids having to amend later.

Arizona uses the term statutory agent for the person or company that receives legal process and official mail on the partnership's behalf. You must have one decided on before you register, because the agent's name and Arizona address go on the registration.

Statutory agent requirements

• The agent must have a physical street address in Arizona — a P.O. box alone will not satisfy the requirement.
• The agent must be available during normal business hours to accept service of process.
• The agent must consent to the appointment; Arizona typically requires a signed statutory agent acceptance.

Your options

• A partner: Any partner with a qualifying Arizona street address can serve, though their address becomes part of the public record.
• Another trusted individual: An Arizona resident — an attorney, an office manager, a colleague — with a physical Arizona address.
• A commercial statutory agent service: A company that provides the address and the coverage. This keeps a partner's home address out of the public database and ensures someone is always present to receive documents, even when the partners are traveling or in court.

This is the step that actually creates your LLP status. Arizona LLPs register with the Arizona Secretary of State at azsos.gov/business — not with the Arizona Corporation Commission, which handles LLCs and corporations. Filing with the wrong agency is one of the most common mistakes, so confirm you are on the Secretary of State's business filings.

What the registration includes

• Partnership name with the required LLP designator
• Principal office address of the partnership
• Statutory agent's name and Arizona street address, with the agent's acceptance
• A statement electing LLP status under Arizona's partnership act
• Signatures from partners authorized to make the filing

Processing

Standard processing at the Secretary of State runs on the order of a couple of weeks. Once the registration is accepted, the LLP status takes effect, the liability shield attaches, and your partnership appears in the state's business records. From there you can obtain evidence of the filing to show banks and other institutions.

The registration is not the partnership agreement

Registering as an LLP does not spell out how your firm operates internally. That is the job of the partnership agreement, covered in Step 5. The state filing only establishes the shield and the public record; it says nothing about profit splits, voting, or partner buyouts.

A partnership needs a federal Employer Identification Number. Because an LLP always has two or more partners, it is treated as a partnership for tax purposes and must have an EIN — there is no single-member disregarded-entity option here the way there is for a solo LLC.

Why you need it

• To open a business bank account in the partnership's name
• To file the partnership's federal return (Form 1065) and issue K-1s to the partners
• To hire employees and handle payroll tax withholding
• To register for Arizona state tax accounts where required

How to get one

The EIN comes from the IRS, not from the state of Arizona. You can apply online through the IRS website and receive the number immediately during the session, or apply by mail or fax if you prefer. There is no federal charge for an EIN. Apply after your LLP registration is accepted so the entity information matches. If a partner's business or lease timeline is tight, note that the online IRS application is available only during posted hours.

Arizona does not require you to file a partnership agreement with the state, and it does not require an LLP to have a written one at all — but operating without one is a serious mistake for a multi-partner firm. The partnership agreement is the contract that governs how your business runs, and in an LLP there is always more than one owner whose interests need to be defined.

What the agreement should cover

• Each partner's capital contribution and ownership percentage
• How profits and losses are allocated and distributed
• Voting rights and how decisions get made
• Each partner's duties and authority to bind the firm
• What happens when a partner leaves, dies, becomes disabled, or wants to sell their interest
• How new partners are admitted and how disputes are resolved

Without a written agreement, Arizona's default partnership rules fill every gap — and those defaults, such as equal profit-sharing regardless of contribution, frequently do not match what the partners actually intended. A written agreement also reinforces that the LLP is being run as a real, separate business, which matters if anyone ever challenges the shield.

Registering the LLP is a one-time event. Keeping it in good standing is an ongoing responsibility, and a partnership that lets its filings lapse can lose the standing it worked to establish.

Annual renewal

Arizona LLPs must renew their registration on an annual cycle, with the renewal due in the spring. Missing it puts the LLP's good standing — and by extension the reliability of its shield — at risk. Calendar the deadline the moment you register, or use a service that tracks it for you.

Statutory agent maintenance

Your statutory agent must remain in place and reachable at a valid Arizona street address for the life of the LLP. If the agent resigns, moves, or becomes unavailable, you have to update the record promptly. An LLP with a stale or invalid agent address is technically out of compliance.

Taxes and licenses

Separate from state registration, the partnership files its federal Form 1065 each year and each partner reports their K-1 income. Depending on the firm's activity and location, you may also need an Arizona transaction privilege tax license, city business licenses, and professional licensing renewals. These run on their own schedules and are not handled by the LLP registration itself.