Illinois LLP Frequently Asked Questions

An Illinois limited liability partnership is a general partnership that has filed a Statement of Qualification with the Secretary of State to add a liability shield. Illinois partnerships operate under the Uniform Partnership Act (1997), codified at 805 ILCS 206.

What makes it different from a plain partnership

In a general partnership, every partner is personally liable for the debts and wrongful acts of the business and of the other partners. That is a heavy exposure — a co-partner's malpractice can reach your personal assets. The LLP removes that automatic exposure. After qualification, a partner is generally not personally liable, solely by being a partner, for the partnership's obligations. You still answer for your own conduct, but not for your partners'.

What makes it different from an LLC

An LLC has members and is formed with Articles of Organization; it can be member-managed or manager-managed. An LLP has partners and is formed by filing a Statement of Qualification on an underlying partnership. Both shield owners, but the LLP keeps partnership governance and pass-through partnership taxation, which is why professional practices favor it.

Who forms an LLP

LLPs are common among licensed professionals who practice together — lawyers, accountants, architects, engineers, physicians, dentists — and among established partnerships that want the shield without becoming a corporation. If your business is genuinely a partnership of skilled people, the LLP is usually the natural structure.

This section covers the mechanics of getting an Illinois LLP on the books.

How you register

You file a Statement of Qualification with the Illinois Secretary of State, Department of Business Services. It records the LLP name, principal office, registered agent, number of partners, and the election to be an LLP. It does not disclose your partnership agreement or your finances. You can reach the state's materials through the business services pages.

Naming rules

Your name must include an LLP designator — "Registered Limited Liability Partnership," "Limited Liability Partnership," "R.L.L.P.," "L.L.P.," "RLLP," or "LLP" — and must be distinguishable from other names on file. Check availability through the Illinois business entity search before filing.

Registered agent

Every registered LLP must maintain an Illinois registered agent with a physical street address, available during business hours to receive service of process and state mail. A partner can serve, or you can use a commercial service to keep a home address off the public record and guarantee availability.

A note for professionals

Certain professional partnerships in Illinois cannot file online and must submit on paper. If your practice is a licensed profession, plan for a mailed filing rather than an instant online registration.

Registration is one step; staying in good standing is the ongoing work.

Annual report

Illinois requires a registered LLP to file an annual report each year to keep its registration — and therefore its shield — current. Treat the deadline as firm; letting it lapse can put the registration at risk.

How an LLP is taxed

An LLP is a pass-through entity. The partnership itself does not pay federal income tax on its profits. Instead it files an information return (Form 1065) and issues a Schedule K-1 to each partner, who reports their share on their personal return. Illinois taxes partnership income at the partner level as well, and Illinois imposes a replacement tax that can apply to partnerships — a point to review with your accountant. The firm may also need to register with the Illinois Department of Revenue for withholding or other taxes depending on its activity.

Registered agent upkeep

Keep a valid Illinois agent on file at all times and update the state whenever the agent changes, resigns, or moves. An outdated agent leaves the partnership technically noncompliant even if the annual report is current.

The liability shield and the partnership agreement are the two things partners most often misunderstand.

What the shield does not cover

The LLP protects you from your partners' mistakes, not your own. You remain liable for your own malpractice or wrongful acts. Personal guarantees you sign are separate contracts the shield does not touch. And the shield only holds while the LLP stays registered and in good standing — if the registration lapses, exposure can return for obligations incurred during the gap.

Do we need a partnership agreement

Illinois does not require you to file one, and does not make you have one to register. But you should have a written agreement in force. It sets profit and loss allocation, capital contributions, management authority, voting, admission and withdrawal of partners, and dissolution. Without it, the Uniform Partnership Act's default rules govern everything — often in ways partners did not intend.

How an LLP ends

When the partners decide to wind up the firm, the partnership completes its affairs — paying debts, settling accounts, and distributing what remains — and files the appropriate paperwork with the Secretary of State to end the LLP registration. Our dissolution guide covers the process in detail.

A few practical points partners weigh before filing.

What it costs

Illinois charges a state filing fee to register the LLP and a fee for the annual report that keeps it current. Our receipt card shows the current figures for your order; we display exactly what the state charges, with no marked-up "state fees." Expedited processing is available for an added fee on many filings if you are on a tight timeline.

How long it takes

Routine processing runs several business days after the state receives your filing. Professional partnerships that must file on paper should allow additional mailing and handling time. Getting an EIN from the IRS is same-day and free; opening a bank account can happen as soon as you have the filed Statement of Qualification and your EIN.

Where Mainstay Filing fits

We prepare and file your Statement of Qualification, serve as your registered agent, and track the annual report so your registration and shield stay intact. We are a filing service, not a law or accounting firm, so your partnership agreement, equity structure, and tax planning stay with your attorney and CPA. What we handle is the state-facing paperwork, done accurately and on time.