A partnership business structure is an unincorporated business owned by two or more people who share in the profits, losses, and management of the enterprise. It forms the moment two people start running a business together for profit, even without paperwork, and it’s governed primarily by the Revised Uniform Partnership Act (RUPA), adopted in some version by nearly every state. The partnership itself pays no federal income tax; income passes through to the partners, who report it on their personal returns. That simplicity is why partnerships are one of the most common vehicles for small and mid-sized businesses. The trade-offs are personal liability and self-employment tax, and both catch new partners off guard.
Every partner acts as an agent of the partnership for ordinary business activities. A contract one partner signs, a loan one partner takes out, or a deal one partner strikes in the normal course of business binds every other partner. This mutual agency principle is one of the most consequential features of the structure, and one of the strongest reasons to choose partners carefully and put a written agreement in place.
The Four Types of Partnerships
General Partnership
A general partnership is the default. All partners share management authority and face unlimited personal liability for the business’s debts and obligations. If the partnership can’t pay a creditor, creditors can go after any partner’s personal assets to cover the shortfall. Under most state adoptions of RUPA, this liability is joint and several, meaning a creditor can pursue one partner for the full amount rather than splitting the claim among all of them. No filing is required for a general partnership to exist.
Limited Partnership
A limited partnership (LP) splits partners into two categories. At least one general partner manages the business and bears unlimited liability, and one or more limited partners contribute capital but stay out of day-to-day management. Limited partners can lose their investment, but their personal assets beyond that investment are typically protected. Forming an LP requires filing a certificate of limited partnership with the state.
Limited Liability Partnership
A limited liability partnership (LLP) allows all partners to participate in management while shielding each from personal liability for another partner’s negligence or malpractice. This structure is popular among professional firms like law practices and accounting firms, where one partner’s mistake shouldn’t wipe out every other partner’s savings. Most states require LLPs to include a designation like “LLP” in the business name.
Limited Liability Limited Partnership
A limited liability limited partnership (LLLP) adds a liability shield on top of the standard LP structure. In a regular LP, the general partner has unlimited personal liability. In an LLLP, even the general partner gets protection from the partnership’s debts and obligations, similar to a corporate shareholder. The shield does not protect any partner from liability caused by their own conduct. Not every state recognizes LLLPs, so availability depends on where you form the entity.
How a Joint Venture Differs
A joint venture looks like a partnership but is limited to a single project or defined transaction rather than an ongoing business. Two companies might form a joint venture to develop one property or complete one contract. The fiduciary duties in a joint venture tend to be narrower, tailored to that specific deal. If what started as a one-off project turns into a continuing business relationship, courts may reclassify it as a partnership with all the corresponding obligations.
How Partnerships Are Taxed
A partnership pays no federal income tax. Under federal law, the entity itself is not subject to income tax; the people carrying on business as partners are taxed individually on their shares of the income.1Office of the Law Revision Counsel. 26 USC 701 – Partners, Not Partnership, Subject to Tax The partnership files an informational return (Form 1065) and issues each partner a Schedule K-1 reporting their share of income, deductions, and credits.2Internal Revenue Service. 2025 Partner’s Instructions for Schedule K-1 (Form 1065) Each partner then reports that information on their personal tax return.
Form 1065 is due by the 15th day of the third month after the partnership’s tax year ends. For a calendar-year partnership, that’s March 15. An automatic six-month extension is available by filing Form 7004.3Internal Revenue Service. Publication 509 (2026), Tax Calendars Missing the deadline triggers penalties.
Self-Employment Tax
General partners owe self-employment tax on their full distributive share of partnership income plus any guaranteed payments. The combined rate is 15.3 percent (12.4 percent for Social Security and 2.9 percent for Medicare), with the Social Security portion applying only to the first $184,500 of earnings in 2026.4Social Security Administration. Contribution and Benefit Base Income above that threshold still owes the 2.9 percent Medicare portion, and high earners pay an additional 0.9 percent Medicare surtax on earnings above $200,000 (single filers) or $250,000 (joint filers).
Limited partners get a meaningful break here. Federal law excludes a limited partner’s distributive share of income from self-employment tax; only guaranteed payments for services the limited partner actually performs are subject to it.5Office of the Law Revision Counsel. 26 USC 1402 – Definitions This distinction is one of the main tax reasons investors prefer limited partner status.6Internal Revenue Service. Entities 1
The Qualified Business Income Deduction
Partners may be eligible to deduct up to 20 percent of their qualified business income (QBI) under Section 199A, which was made permanent in 2025. The deduction applies to income from a domestic business operated through a partnership, sole proprietorship, or S corporation. Guaranteed payments, wage income, and investment income do not count as QBI.7Internal Revenue Service. Qualified Business Income Deduction Above certain income thresholds, the deduction phases out for specified service trades (like consulting, law, and accounting) and can be limited by the amount of W-2 wages the partnership pays and the value of its depreciable property.
Fiduciary Duties Between Partners
Partners owe each other two fiduciary duties under RUPA: the duty of loyalty and the duty of care. These are legally enforceable obligations that can result in personal liability if breached.
The duty of loyalty means a partner cannot siphon partnership profits or opportunities for personal gain, cannot deal with the partnership as an adversary, and cannot compete with the partnership while it’s still operating. If a partner secretly diverts a business opportunity that should have gone to the firm, the other partners can hold that partner accountable as a trustee of the misappropriated benefit.
The duty of care is a lower bar than many people expect. A partner must avoid grossly negligent or reckless conduct, intentional misconduct, and knowing violations of law. Ordinary business mistakes that don’t rise to gross negligence won’t trigger liability. That level is set intentionally, so partners can take reasonable business risks without fear of being sued by co-partners every time a deal goes wrong.
What a Partnership Agreement Should Cover
Operating without a written partnership agreement is the single most common mistake new partners make. Without one, the default rules of your state’s partnership statute fill every gap, and those defaults often produce outcomes nobody wanted. The default in nearly every state is an equal split of profits regardless of how much each partner contributed or how many hours they work.
Capital Contributions and Ownership
Document what each partner contributes at the start, whether that’s cash, property, or services. Assigning a dollar value to each contribution at the time of entry establishes each partner’s initial basis and prevents arguments later about who owns what percentage. If one partner contributes $100,000 in cash and another contributes specialized expertise, the agreement needs to spell out how those contributions translate into ownership shares.
Profit and Loss Allocation
Specify how profits and losses are divided. This can follow ownership percentages, but it doesn’t have to. Some partnerships allocate a larger share of early profits to partners who contributed more capital, then equalize over time. Whatever the split, it controls how each partner’s Schedule K-1 is calculated, so it directly affects everyone’s tax bill.
Management Authority
Because every partner can bind the partnership through mutual agency, the agreement should define who has authority to sign contracts, take on debt, hire employees, and make purchases above a certain dollar threshold. Limiting signing authority to specific partners or requiring multiple signatures above a set amount is one of the most practical protections available.
Buy-Sell Provisions
A buy-sell clause determines what happens to a partner’s share when specific triggering events occur: death, disability, retirement, divorce, bankruptcy, or simply wanting out. Without these provisions, the remaining partners may be forced into business with the departing partner’s heirs or creditors. The agreement should specify a valuation method, whether that’s a fixed price updated annually, a formula based on a multiple of earnings, or a professional appraisal at the time of the event. Many partnerships fund these buyouts with life insurance policies on each partner.
Dispute Resolution and Exit Procedures
Establish a process for resolving disagreements, typically mediation followed by binding arbitration rather than litigation. Cover voluntary withdrawal too: how much notice is required, how the departing partner’s interest is valued, and whether the remaining partners can continue the business. Under RUPA, a partner who wrongfully leaves a definite-term partnership before the term expires is liable to the other partners for damages caused by the departure.
Registering the Partnership
A general partnership technically does not need to file anything with the state to exist. Limited partnerships, LLPs, and LLLPs all require formal registration. Even general partnerships typically need to register a trade name if they operate under any name other than the partners’ legal names.
Limited partnerships file a certificate of limited partnership, and LLPs file a statement of qualification. These forms go to the Secretary of State or equivalent agency in your state of formation. Before filing, run a name availability search to confirm the business name you want is distinguishable from existing entities in that state’s records.
Every formally registered partnership must designate a registered agent with a physical address in the state of formation. This person or company receives lawsuits and government correspondence on behalf of the partnership. You can serve as your own registered agent, but many partnerships hire a commercial service so legal documents don’t arrive at the front desk during business hours.
Every partnership needs an Employer Identification Number (EIN) from the IRS. The fastest method is the IRS’s free online application, which issues the number immediately upon approval.8Internal Revenue Service. Get an Employer Identification Number You can also file Form SS-4 by fax or mail if the responsible party’s principal place of business is outside the United States.9Internal Revenue Service. Instructions for Form SS-4 Form your entity with the state before applying for the EIN; the IRS notes that applying first can cause delays.
Filing fees for partnership formation documents vary by state and entity type, generally falling in the $50 to $500 range. Most states accept online filings with credit card payment, and processing for digital submissions can take as little as a few hours. Paper filings sent by mail typically take several weeks.
Operating Across State Lines
If the partnership does business in a state other than its state of formation, it may need to register as a foreign entity in that additional state. This process, called foreign qualification, involves filing a certificate of authority, appointing a registered agent in that state, and paying a separate filing fee. Operating in another state without registering can cost the partnership its ability to file lawsuits in that state’s courts, and many states impose back taxes and penalties retroactive to when the partnership first began operating there.
Annual Reports and Good Standing
Limited partnerships and LLPs are generally required to file an annual or biennial report with their formation state and each state where they’re registered as a foreign entity. These reports update basic information like the partnership’s address, registered agent, and partner names. Due dates vary by state, and filing fees typically run from under $50 to several hundred dollars. Losing good standing can block the partnership from entering contracts, qualifying in other states, or maintaining bank accounts. Prolonged non-compliance can result in administrative dissolution, effectively revoking the partnership’s legal existence.
Dissolution and Winding Up
Dissolution doesn’t mean the partnership disappears overnight. The partnership stops taking on new business and begins winding up: finishing existing deals, collecting debts owed to the firm, liquidating assets, and settling obligations.
Under RUPA, dissolution occurs when:
- A partner gives notice of withdrawal from a partnership with no fixed term (a “partnership at will”).
- The term expires or the project completes in a partnership formed for a definite term or specific undertaking.
- All partners agree to wind up the business.
- Continued operation becomes illegal and the illegality isn’t cured within 90 days.
- A court orders dissolution because the partnership’s economic purpose is frustrated, a partner’s conduct makes it impracticable to continue, or the business can no longer operate in conformity with the partnership agreement.
In a definite-term partnership, a single partner’s death or other dissociation doesn’t automatically dissolve the firm. The remaining partners have 90 days to vote on whether to continue.
Winding up follows a strict priority. Outside creditors get paid first. Then partners who are owed for anything other than capital and profits are repaid. After that, partners receive their capital contributions, and any remaining surplus is divided as profits. If the partnership’s assets aren’t enough to cover its debts, each general partner must contribute personally to cover the shortfall in proportion to their share of losses. When one partner can’t pay their share, the remaining partners must cover the gap.
The partnership must file a final Form 1065 for the tax year in which it winds up its affairs. The partnership’s tax year ends on the date it completes winding up, not the date dissolution was triggered.10Internal Revenue Service. Instructions for Form 1065 Each partner receives a final Schedule K-1 and reports their share of income or loss from the final year on their individual return.