The Partnership Agreement for an Illinois LLP

For an LLP, the equivalent of an LLC's operating agreement is the partnership agreement. It is the private contract among the partners that sets out how the firm is owned, run, and eventually unwound. Illinois partnerships operate under the Uniform Partnership Act (1997), codified at 805 ILCS 206, and the Act is deliberately built to let partners set their own rules through this agreement.

The agreement overrides the defaults

The Uniform Partnership Act supplies default rules for almost everything — how profits are shared, how decisions are made, how a partner exits. But most of those defaults apply only when the partnership agreement is silent. Where your agreement addresses a matter, its terms generally control. That is the whole power of the agreement: it lets partners replace one-size-fits-all statutory defaults with terms tailored to their firm.

The default rules rarely fit

Left to the Act's defaults, partners typically share profits equally regardless of contribution, have equal management rights regardless of role, and are subject to statutory buyout rules that may not reflect how the firm actually operates. For a practice where partners contributed different amounts, joined at different times, or carry different responsibilities, the equal-split defaults are almost never what anyone intended. A written agreement is how you avoid inheriting rules you did not choose.

Not filed, but essential

Illinois does not require you to file the partnership agreement, and it never becomes public. But "not required to file" is very different from "not needed." The agreement should be in force before the firm takes on meaningful work, admits partners, or opens accounts.

The financial core of the agreement defines who owns what, who put in what, and how money moves out of the firm.

Ownership interests

Spell out each partner's ownership interest in the firm. For a professional practice, ownership is often tied to seniority, book of business, or buy-in, and it does not have to be equal. State the interests precisely so there is no ambiguity later.

Capital contributions

Record what each partner contributed at formation — cash, property, or in some cases services — and whether partners can be called on for additional capital contributions later, and on what terms. Unaddressed capital calls are a frequent source of partner conflict, so decide the rules in advance.

Profit and loss allocation

Set how profits and losses are allocated. This need not match ownership percentages — many firms allocate based on origination, hours, or a formula that rewards specific contributions. Be explicit, because the statutory default is equal sharing, which is rarely what a differentiated practice wants.

Draws and distributions

Define when and how partners take money out — regular draws, periodic distributions, and the timing and priority of each. Clear distribution rules prevent the friction that arises when partners have different expectations about cash flow.

An LLP is partner-run by nature, but "partner-run" can mean very different things, and the agreement is where you make it concrete.

Management structure

Decide how the firm is managed. Some LLPs are run collectively by all partners; others designate a managing partner or a small management committee for day-to-day decisions while reserving big decisions for the full partnership. Define who has authority over what — spending limits, hiring, taking on obligations, admitting partners.

Voting

Set how partners vote and how votes are weighted. Options include one vote per partner, votes weighted by ownership interest, or a hybrid. Specify which decisions require a simple majority, a supermajority, or unanimity — for example, admitting a new partner, taking on major debt, or dissolving the firm typically warrant a higher threshold.

Binding the partnership

Under partnership law, a partner can often bind the firm in the ordinary course of business. The agreement can define the limits of that authority among the partners — who may sign contracts, who may commit the firm financially, and what requires collective approval. While these internal limits do not always bind outsiders who deal with the firm in good faith, they govern the partners' relationship and their liability to one another.

The hardest partnership problems are about people entering and leaving, and this is where a good agreement earns its keep. It is also where the agreement intersects with the LLP shield that distinguishes the firm from a general partnership.

Admitting new partners

Define how a new partner is admitted — the vote required, the buy-in, and how ownership and profit shares adjust. Without a clear path, bringing in a new partner becomes a negotiation from scratch every time.

Withdrawal, retirement, and expulsion

Address what happens when a partner leaves voluntarily, retires, becomes disabled, dies, or must be expelled. Include how the departing partner's interest is valued and bought out, over what period, and on what terms. A written buyout formula agreed in calm times is far better than negotiating one during a dispute.

The shield and the agreement working together

Registering the LLP creates the liability shield — partners are generally not personally liable for the firm's debts or a co-partner's wrongful acts. The partnership agreement complements that shield by governing the partners' obligations to each other, including whether any partner has agreed to assume liabilities they would otherwise be shielded from. The agreement can also reinforce the separateness that keeps the shield strong: requiring firm contracts to be signed in the partnership's name, firm funds to stay in firm accounts, and firm records to be kept apart from personal affairs. The shield and the agreement are two halves of what makes an LLP more than a general partnership.

The final sections of a strong agreement handle the end of the relationship and how disagreements get resolved along the way.

Dissolution and winding up

Set out the circumstances under which the firm dissolves, the vote required, and how winding up proceeds — the order in which debts are paid and remaining assets are distributed. This aligns with the Uniform Partnership Act's winding-up framework while letting partners set their own terms where the Act permits. Having these terms in the agreement makes an eventual wind-down far smoother than relying on defaults.

Dispute resolution

Consider including a mechanism for resolving disputes among partners — mediation or arbitration clauses, or a defined internal process — so a disagreement does not automatically become litigation that damages the practice.

Professional-practice specifics

A professional LLP should address matters unique to licensed practice: how client files and matters are handled if a partner leaves, record-retention obligations, and any requirements imposed by the relevant licensing board on the ownership or management of the practice. Generic templates rarely cover these.

Review it periodically

A partnership agreement is not a document you sign once and forget. Revisit it when partners join or leave, when the firm's economics change, or when the law changes. An agreement that reflects a five-partner firm may not fit a fifteen-partner firm. Because this is a legal document with real financial consequences, an attorney should draft or review it — Mainstay Filing handles your state registration and registered agent service, but the partnership agreement itself belongs with your counsel.