A 50/50 partnership agreement is the written contract between two equal co-owners that sets out contributions, profit and loss splits, decision-making authority, how deadlocks get broken, and what happens when one partner leaves or dies. Nothing in the law requires you to put it in writing. Everything about running a two-owner business says you should. Without the document, your state’s partnership statute fills every gap it finds, and the equal split guarantees that any serious disagreement produces a tie with no built-in way to resolve it.
Courts have enforced oral partnerships for over a century, so an unwritten deal is legally real. It is also an invitation to litigation, because the only evidence of the terms is each partner’s memory. Every state has adopted some version of the Uniform Partnership Act or the Revised Uniform Partnership Act, and those defaults assume equal profit sharing, equal management authority, and no salary for either partner. If that matches your plan, you are lucky. If it does not, a written agreement is the only way to override it. Banks, landlords, vendors, and anyone later buying the business will also ask to see it.
Personal Liability Is Unlimited and Joint
This is the point most people forming a 50/50 partnership underestimate. In a general partnership, both partners carry unlimited personal liability for all partnership debts. If the business cannot pay a creditor, that creditor can reach your personal bank accounts, your car, and in some states your home. Owning only half does not cap your exposure. Under the joint and several liability rules most states apply, a creditor can pursue either partner for the full amount, not just half.
The exposure extends past your own actions. If your partner signs a bad contract, commits negligence in the course of business, or takes on debt you did not approve, you are on the hook. The agreement can allocate liability between the two of you internally, but those internal terms do not bind outside creditors. Insurance helps: general liability, professional liability, and umbrella coverage reduce the practical risk without changing the underlying legal structure. If the stakes are high enough, consider whether an LLC or limited partnership makes more sense than a general partnership before you draft anything.
Capital Contributions and Ownership
Spell out exactly what each partner is putting in to start the business. Contributions can include cash, equipment, real estate, intellectual property, or services. When a partner contributes something other than cash, the agreement needs to assign a dollar value that both partners accept. Disagreements about the value of a used truck or a client list are common, and the time to resolve them is before the partnership begins.
Each partner’s contributions flow into a capital account, a running ledger of what the partner has put in and taken out. The IRS requires partnerships to maintain capital accounts under specific Treasury regulations to ensure that allocations of income and loss have what the tax code calls “substantial economic effect.”1eCFR. 26 CFR 1.704-1 – Partner’s Distributive Share With equal initial contributions, the accounts start symmetrical and stay that way as long as profits and losses are split evenly. If one partner contributes more cash or property, the accounts begin unequal, and the agreement should say how that imbalance affects distributions or buyout calculations later.
Address future contributions too. If the business needs more funding, are both partners required to put in equally? What happens if one cannot or will not? Some agreements dilute the non-contributing partner’s ownership; others treat the extra contribution as a loan to the partnership at a stated interest rate. Pick a method before the cash crunch arrives.
Profit and Loss Allocation
The default rule in a 50/50 partnership is straightforward: each partner gets half the profits and absorbs half the losses. But “profits” here means taxable income after expenses, not the cash in the bank. The agreement should distinguish between allocating income for tax purposes and distributing actual cash, because they are not the same. A partnership can allocate $100,000 to each partner on paper while keeping most of the cash in the business for operations.
Each year the partnership reports total income and deductions on Form 1065 and issues a Schedule K-1 to each partner showing that partner’s allocated share.2Internal Revenue Service. About Form 1065, U.S. Return of Partnership Income The K-1 reports income, deductions, credits, and other items that the partner then carries over to their personal return.3Internal Revenue Service. Partner’s Instructions for Schedule K-1 (Form 1065) (2025) State the allocation method clearly in the agreement. For most 50/50 partnerships a simple equal split works. Partnerships with unequal capital or materially different roles sometimes use more complex formulas.
A distribution schedule belongs in the agreement as well. Specify how often cash goes out (monthly, quarterly, annually) and what conditions trigger or block a distribution. Most agreements require at least a tax distribution large enough to cover each partner’s personal tax on their allocated share, because partners owe tax on the allocation whether or not any cash actually reaches them.
Tax Obligations You Will Actually Owe
A partnership is a pass-through entity. The partnership itself does not pay federal income tax; income and losses flow through to the partners, who report them on their individual returns.2Internal Revenue Service. About Form 1065, U.S. Return of Partnership Income Your share is taxable to you personally whether or not the business distributes anything.
Employer Identification Number
Every partnership needs an EIN from the IRS, even without employees.4Internal Revenue Service. Employer Identification Number You will need it to file the partnership return, open a business bank account, and handle most regulatory filings. The IRS issues EINs for free through an online application that takes about ten minutes, but form the partnership at the state level first.5Internal Revenue Service. Get an Employer Identification Number
Partnership Representative
Under the centralized partnership audit regime, the partnership must designate a partnership representative on its tax return each year.6Internal Revenue Service. Designate or Change a Partnership Representative That person has sole authority to act for the partnership in an IRS audit, and both partners are bound by the representative’s decisions.7Internal Revenue Service. BBA Centralized Partnership Audit Regime Name the representative in the agreement and say whether that partner has to consult the other before acting during an audit. Eligible partnerships with 100 or fewer partners can elect out of the centralized regime on a timely filed return, which is worth raising with your accountant.
Self-Employment Tax
General partners owe self-employment tax on their distributive share of ordinary business income, including any guaranteed payments.8Internal Revenue Service. Entities 1 The rate is 15.3 percent, covering Social Security and Medicare. It applies on top of regular income tax and is not withheld automatically, which catches new partners off guard. The agreement should address estimated tax payments and whether distributions get timed to cover each partner’s quarterly obligations.
Management Authority and Breaking a Deadlock
Each partner is an agent of the business and can bind the partnership to contracts made in the ordinary course of business. That is the default rule of mutual agency. Your partner can sign a vendor agreement, hire an employee, or commit to a service contract without your signature. The agreement should define which actions either partner can take alone and which require both signatures.
Most 50/50 agreements use two tiers. Routine operations, like purchasing supplies, scheduling work, and managing existing clients, can be handled by either partner alone. Major decisions require both partners to approve: borrowing above a set threshold, signing leases, hiring or firing key employees, entering new markets, selling partnership assets. Also define each partner’s expected role and time commitment. One partner may handle sales and client work while the other runs operations and finance. Defining the lanes reduces overlap and creates accountability.
Deadlock Resolution
The defining weakness of the 50/50 split is deadlock. When equal owners disagree on a major decision, there is no majority to break the tie, and without a mechanism in the agreement the business stalls. This is where two-owner partnerships most often fail. Common approaches:
- Mandatory mediation with a neutral mediator before either partner can file suit.
- An advisory board or named third-party advisor who casts the deciding vote on contested issues.
- Domain-based tie-breaking authority, where each partner has final say within their assigned area of responsibility.
- A buyout trigger that lets either partner invoke the buy-sell provisions if the deadlock persists past a set period.
Whichever method you choose, set clear timelines. A deadlock that lingers for months while the partners cycle through procedures can damage the business as badly as the underlying disagreement.
Fiduciary Duties You Cannot Fully Waive
Partners owe each other two fiduciary duties that cannot be completely waived, even by agreement. Violating them can expose a partner to personal liability to the other partner, separate from any business debts.
The duty of loyalty requires each partner to account for any profit or benefit derived from the partnership’s business or property. You cannot take a partnership opportunity for yourself, deal with the partnership on behalf of someone with a conflicting interest, or compete with the partnership while it exists. If a customer approaches you with a side deal that falls within the partnership’s scope, that opportunity belongs to the partnership.
The duty of care is a lower bar than people often expect. A partner only breaches it through gross negligence, recklessness, intentional misconduct, or knowing violations of law. Ordinary bad judgment, even expensive bad judgment, does not breach the duty of care. The agreement can define how these duties apply to your business, but it cannot eliminate them.
Confidentiality, Non-Competes, and Intellectual Property
Partners routinely have access to trade secrets, customer lists, pricing, and proprietary methods. Include confidentiality provisions that survive the partnership’s termination, so a departing partner cannot share or exploit that information afterward.
Non-compete clauses restrict a departing partner from starting or joining a competing business for a defined period in a defined area. Enforceability varies dramatically by state. Some enforce reasonable non-competes in the partnership context even when they restrict them in employment relationships. A handful of states severely limit or prohibit them. Draft the clause narrowly enough to be enforceable where you are, typically limited to the partnership’s industry, a reasonable geographic radius, and one to three years after departure.
Non-solicitation clauses are generally easier to enforce because they are narrower. They prevent a departing partner from recruiting the partnership’s employees or soliciting its clients for a set period. The agreement should also assign intellectual property. The cleanest approach gives all partnership-related IP to the partnership itself, with each partner keeping what they created before the partnership began.
Buy-Sell Provisions for a Departing Partner
A partner leaving a 50/50 partnership is the event most likely to destroy value if the agreement has not planned for it. The buy-sell section needs to answer three questions: what triggers a buyout, how the departing partner’s interest is valued, and how the remaining partner pays for it.
Triggering Events
List every event explicitly. Common ones are voluntary withdrawal, death, permanent disability, retirement, divorce, bankruptcy, and material breach of the agreement. An event not listed may leave both partners in legal limbo when it happens.
Valuation
Price is the most contested element of any buyout. Lock in a valuation method before any triggering event. Common methods include a fixed price updated annually by mutual agreement, a formula based on revenue or earnings multiples, or an independent appraisal by a qualified business appraiser selected through a defined process. Under default partnership law, the buyout price roughly equals what the departing partner would have received if the partnership’s assets were sold at fair market value on the date of departure. Agreeing on a method in advance avoids an expensive fight at the worst possible moment.
Right of First Refusal
If a partner wants to sell their interest to an outsider, a right of first refusal lets the remaining partner buy that interest at the same price and on the same terms the outside buyer offered. Set a window, commonly 20 to 60 days, for the remaining partner to decide. Transfers made without honoring the right can be declared void under the agreement.
Funding the Buyout
A buyout only works if the remaining partner can actually pay. Life insurance is the most common funding mechanism for death-triggered buyouts. Two structures dominate: a cross-purchase arrangement where each partner owns a policy on the other, and an entity-purchase arrangement where the partnership owns policies on both partners. For other triggers, specify the payment timeline. Default partnership law gives the remaining partner up to 120 days to pay, but the agreement can set a different schedule, including installments over several years with interest.
Dissolution and Winding Up
Dissolution ends the business’s operations, as opposed to a single partner’s departure. It can happen by mutual agreement, by the expiration of a fixed term, or when continuing becomes impractical. Define the specific events that trigger dissolution and the process for winding up.
During winding up, the partnership finishes existing contracts, collects debts owed to it, and converts remaining assets to cash. Order of payment matters: outside creditors first, then amounts owed to partners other than for capital and profits, then return of capital contributions, then any remaining funds split between the partners. With equal contributions the final split is simple. If contributions were unequal, the capital account balances determine who receives what. Address the business name, client relationships, and intellectual property too; these have value and dividing them needs the same specificity as dividing cash.
Signing and What to Do Next
A partnership agreement does not have to be notarized to bind both partners. Notarizing the signatures adds authentication that can prevent a later claim of forgery or non-signing. Fees are minimal, typically under $15 per signature.
After signing, apply for your EIN through the IRS online portal.5Internal Revenue Service. Get an Employer Identification Number With the EIN and the signed agreement, open a dedicated business bank account. Most banks will ask for the EIN, the partnership agreement, any ownership agreements, and a business license if your jurisdiction requires one.9U.S. Small Business Administration. Open a Business Bank Account Keep the original signed agreement at the partnership’s principal place of business and give each partner a complete copy. Revisit it once a year to update valuation figures, confirm that any buy-sell funding is still adequate, and adjust provisions that no longer match how the business actually operates.