What Exactly Is a Partnership for Tax Purposes?
For federal tax purposes, “partnership” is defined broadly in § 761(a) as any syndicate, group, pool, joint venture, or other unincorporated organization through which a business or financial venture is carried on, provided it is not classified as a corporation, trust, or estate. Not all co-ownership arrangements qualify. For example, § 761(a)(1) and Treas. Reg. § 1.761-2(a)(2) exclude groups formed solely to hold investment property without conducting a trade or business. Likewise, co-owners of property who merely lease real estate without providing services are not treated as a partnership, but adding services can convert the arrangement into a partnership. See Treas. Reg. § 301.7701-1(a)(2).
In other words, the IRS does not require you to file partnership papers for you to be treated as a partnership. If you and someone else are carrying on a business together—even informally—the IRS may classify you as a partnership. Simply co-owning property isn’t enough, but providing services alongside that ownership can be.
Do You Need to File Anything Under State Law to Have a Partnership?
Surprisingly, the answer is no. Treasury Regulation § 301.7701-1(a)(1) makes clear that a partnership may exist for federal tax purposes even without a formal entity recognized under state law. Courts look primarily to intent. In Commissioner v. Culbertson, 337 U.S. 733 (1949), the Supreme Court explained that a partnership exists when parties, in good faith and with a business purpose, intend to carry on an enterprise together and share in its profits. Contributions of labor or capital are not strictly required.
Put simply, you don’t need to go through state filings for the IRS to treat you as a partnership. If two or more people intend to run a business and divide the profits, the law may recognize a partnership—even if no one invested money or contributed labor at the start.
How Are Startup Costs Treated for Tax Purposes?
When forming a partnership, certain expenses must be capitalized under § 709(a). Organizational expenses—those incident to creating the partnership and chargeable to the capital account—may be deducted up to $5,000 immediately, reduced once costs exceed $50,000, with a full phase-out at $55,000. See § 709(b). Any remaining expenses may be amortized over 180 months. Importantly, syndication fees (such as the cost of issuing partnership interests) do not qualify for this election and must be capitalized. If the partnership liquidates early, unamortized expenses may be deducted under § 165.
In other words, some startup costs can be written off right away, but once your expenses get too high, the deduction shrinks and disappears. The balance must be spread out over 15 years. Certain fees—like those for raising capital—can never be deducted this way and must be added to the business’s long-term costs.
How Does the IRS Decide Whether an Entity Is a Partnership or a Corporation?
The “check-the-box” regulations in Treas. Reg. § 301.7701-3 give taxpayers flexibility. By default, unincorporated entities with more than one member are treated as partnerships, while single-member entities are disregarded as separate from their owners. Either type of entity may elect to be taxed as a corporation by filing the appropriate election. This system allows business owners to tailor tax treatment to their goals, though the choice carries long-term implications for taxation and liability.
Put simply, if you form an LLC, the IRS has default settings: one owner means it’s ignored for tax purposes, two or more owners means it’s treated as a partnership. But you can “check the box” to be taxed as a corporation if that makes more sense for your goals. The choice is powerful but also sticky, so it should be made carefully.
What Should I Think About When Choosing Between a Partnership and a Corporation?
The decision between a flow-through entity and a corporation depends on multiple factors. Partnerships avoid entity-level tax and allow losses to flow through to partners. Corporations, by contrast, can defer shareholder-level tax but face double taxation on distributions. Other considerations include the availability of the § 199A deduction, exposure to employment taxes, local filing fees, creditor protection, and the ability to raise capital. No single factor controls; the optimal choice depends on the owners’ income profile and long-term strategy.
In other words, partnerships usually mean simpler taxes because profits and losses go straight to the owners. Corporations can help with liability protection and raising money, but they come with extra layers of tax. The right choice depends on your income level, risk tolerance, and long-term plans.
How Does the § 199A Deduction Work for Partnerships?
Section 199A provides a deduction equal to the lesser of (1) 20% of qualified business income (QBI) or (2) 20% of taxable income reduced by net capital gains. See § 199A(a). QBI for each trade or business is further limited to the greater of (i) 50% of W-2 wages or (ii) 25% of W-2 wages plus 2.5% of the unadjusted basis immediately after acquisition of qualified property. § 199A(b)(2).
The deduction is subject to income thresholds. For 2022, the phase-out begins at $170,050 for single filers and $340,100 for joint filers, fully phasing out at $220,050 and $440,100. § 199A(b)(3).
Specified Service Trades or Businesses (SSTBs)—including law, accounting, consulting, financial services, athletics, and other fields where the principal asset is the reputation or skill of the owners—are further restricted. See § 199A(d)(2). For high-income taxpayers, SSTB income may be partially or entirely excluded from QBI.
Finally, guaranteed payments under § 707(c) do not count as QBI. Nor do payments to partners acting in a non-partner capacity under § 707(a). In addition, Treas. Reg. § 1.199A-5(c)(2)(i) provides that if a trade or business provides property or services to an SSTB and both are commonly owned (50% or more), that portion of income is recharacterized as SSTB income.
Put simply, § 199A is a valuable tax break that allows many business owners to deduct up to 20% of their income. But it comes with lots of caveats: income limits, restrictions for service professions like law and accounting, and rules against manipulating related businesses to qualify. Whether you get the deduction depends on your income level, industry, and how your partnership pays partners.s to partners acting in a non-partner capacity under § 707(a). In addition, Treas. Reg. § 1.199A-5(c)(2)(i) provides that if a trade or business provides property or services to an SSTB and both are commonly owned (50% or more), that portion of income is recharacterized as SSTB income.
