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Choosing a Business Tax Structure: What's Really Different in 2026

 

One of the first and most consequential decisions a business owner makes is how the business will be taxed. It's also one of the most frequently gotten-wrong, because the "right" structure two years ago isn't automatically the right structure today. The One Big Beautiful Bill Act (OBBBA), signed in July 2025, permanently reshaped some of the rules that drive this decision, which makes now a good time to revisit it even if you made your entity choice years ago.

 

Here's a practical walk-through of the main structures, how each is actually taxed, and what's changed.

 

Sole Proprietorship

 

How it's taxed: There's no separate business tax return. All income and expenses flow onto your personal Form 1040 (Schedule C), and net earnings are subject to both income tax and self-employment tax (Social Security and Medicare, roughly 15.3% combined).

 

Why people use it: Simplicity. No formation paperwork, no separate return, minimal compliance cost.

 

The catch: Every dollar of profit is subject to self-employment tax, with no way to split income between wages and distributions. As profit grows, this becomes the single biggest reason owners look at alternatives.

 

Partnership (and Multi-Member LLCs Taxed as Partnerships)

 

How it's taxed: The partnership itself doesn't pay federal income tax. Instead, income, deductions, and credits pass through to partners via Schedule K-1, and each partner reports their share on their own return. General partners typically pay self-employment tax on their share of income; limited partners may not, depending on their role.

 

Why people use it: Flexibility. Partnerships allow special allocations of income, loss, and distributions that don't have to track ownership percentage exactly — useful for real estate deals, joint ventures, and situations where partners contribute different things (capital versus services, for example).

 

The catch: Flexibility comes with complexity. Partnership agreements, capital account tracking, and allocation rules can get intricate fast, and K-1s often arrive late in the filing season.

 

S Corporation

 

How it's taxed: Like a partnership, an S-corp generally doesn't pay entity-level federal tax. Income passes through to shareholders via K-1. The key difference: shareholder-employees must be paid "reasonable compensation" as W-2 wages, subject to payroll tax, while remaining profit can be distributed without self-employment tax.

 

Why people use it: This wage/distribution split is the classic reason owners elect S-corp status once profits are meaningful, it can meaningfully reduce the payroll tax bill compared to a sole proprietorship or partnership, when done correctly.

 

The catch: "Reasonable compensation" isn't optional or arbitrary, the IRS actively scrutinizes S-corps that pay artificially low salaries to shareholder-employees to minimize payroll tax. There are also strict eligibility rules (100 shareholder limit, one class of stock, no non-resident alien shareholders, generally U.S. individuals, certain trusts, and estates only) that can disqualify a business without careful planning, this last point matters in particular for businesses with foreign owners or investors.

 

C Corporation

 

How it's taxed: A C-corp is a separate taxpayer. It pays corporate income tax on its profits, a flat 21% federal rate and then shareholders pay tax again on dividends when profits are distributed. This is the "double taxation" people refer to.

 

Why people use it: For businesses planning to reinvest most profits rather than distribute them, raise venture capital, or eventually go public, the C-corp structure is often unavoidable, most institutional investors expect it. The flat 21% rate can also be attractive compared to individual rates that climb to 37%, if profits are retained in the business rather than distributed.

 

The catch: Double taxation is real if you plan to pay dividends. There are ways to mitigate it (reasonable salary instead of dividends, qualified small business stock exclusions under Section 1202, retaining earnings for growth), but the structure only makes sense with a clear-eyed view of how and when money will eventually leave the company.

 

The QBI Deduction: The Rule That Changed the Calculus

 

For years, the biggest wildcard in the entity-choice decision was the Section 199A qualified business income (QBI) deduction, a 20% deduction available to owners of pass-through businesses (sole proprietorships, partnerships, S-corps, and most LLCs), designed to keep pass-through owners roughly competitive with the 21% C-corp rate. It was scheduled to expire after 2025, which made long-term planning genuinely difficult.

 

That uncertainty is gone. The One Big Beautiful Bill Act made Code Section 199A a permanent provision, while also making several changes to its deduction framework, the deduction rate itself is maintained at 20%.

 

A few specifics worth knowing for 2026 planning:

 

Wider phase-in ranges. Starting in 2026, the phase-in ranges will rise from $100,000 to $150,000 for joint filers and from $50,000 to $75,000 for other taxpayers, which means more taxpayers land in the range where they get a partial deduction rather than none at all.

 

A new minimum deduction. Starting in 2026, a taxpayer with at least $1,000 in total QBI from an active qualified trade or business may claim a minimum QBI deduction of $400, with both amounts adjusted for inflation after 2026.

 

Specified service trades or businesses (SSTBs), think law, accounting, consulting, medicine, financial services still face a hard cutoff. Professions in this category begin to lose the deduction once taxable income exceeds roughly $203,000 for single filers or $406,000 for married filing jointly in 2026, with no partial benefit above the top of the phase-in range, unlike other qualifying businesses.

 

Because the deduction is now permanent, entity and compensation planning can be built around it with real confidence for the first time since 2017, no more racing a sunset date.

 

State Taxes Complicate the Picture

 

Federal treatment is only half the story. Two things worth flagging for any multi-state business:

 

Pass-through entity tax (PTET) elections. Many states let pass-through entities elect to pay state tax at the entity level, effectively working around the federal SALT deduction cap for owners. This remained intact through the OBBBA process and continues to be a meaningful planning lever in states that offer it.

 

QBI conformity varies. Most states conform to the federal Section 199A rules, but several, including California, New Jersey, and Pennsylvania do not, so a structure that's efficient federally may not carry the same benefit at the state level. This is especially important for businesses operating across state lines.

 

So Which Structure Is Right?

 

There's no universal answer, but a rough framework:

 

Just starting out, modest profit, no employees to speak of: sole proprietorship or single-member LLC often makes sense for simplicity.

 

Profitable, service-based, one or a few owners: S-corp election frequently pays for itself through payroll tax savings, once profit clears a reasonable threshold to justify the added compliance cost.

 

Multiple owners with different capital/service contributions, or real estate: partnership structure's flexible allocations are often worth the added complexity.

 

Reinvesting heavily, courting outside investors, or planning an eventual sale to strategic or IPO buyers: C-corp is often the default expectation, tax rate aside.

 

The right call depends on your profit level, growth plans, ownership structure, and the states you operate in and it's rarely a permanent decision. Many businesses change structure more than once as circumstances change (a sole proprietorship becoming an S-corp as profit grows is one of the most common transitions in practice).