The short answer: A pass-through entity is a business that pays no federal income tax of its own. Its profits pass through to the owners, who report that income on their personal returns and pay tax at individual rates. Sole proprietorships, partnerships, most LLCs, and S corporations are all pass-through entities. The structure avoids the double taxation a C corporation faces, and owners may deduct up to 20% of qualified business income. But they are taxed on their share of profit whether or not any cash is actually distributed to them.
The great majority of US businesses are pass-throughs, and for most owners the question is not whether to use one but which one. The four common forms are taxed on the same basic principle yet differ sharply in one respect that costs or saves real money every year: how much of your profit is exposed to self-employment and payroll tax.
This guide covers what pass-through taxation means in practice, the four entity types and how they differ, self-employment tax, the qualified business income deduction, a worked comparison of the same business under three structures, when a C corporation is actually the better answer, and the mistakes that cost owners the most.
Choosing or restructuring an entity?
Countsure advises US and cross-border business owners on entity selection and tax structuring.
Key Takeaways
- A pass-through entity pays no federal entity-level income tax; profits flow to owners and are taxed once, on personal returns.
- Owners are taxed on their allocated share of profit even if nothing is distributed. This is the phantom income problem.
- Sole proprietorships, partnerships, LLCs, and S corporations are all pass-throughs; the C corporation is not.
- The 20% qualified business income deduction is now permanent and can cut the top effective rate on business income from 37% to about 29.6%.
- The biggest structural difference between forms is self-employment tax exposure, and it is where an S corporation election earns its money.
- The S corporation saving is real but smaller than commonly claimed, because a salary is not qualified business income and payroll adds cost.
What "Pass-Through" Actually Means
A C corporation is a separate taxpayer. It files its own return, pays 21% federal tax on its profits, and when it distributes what remains to shareholders, those shareholders pay tax again on the dividend. Two layers of tax on one stream of earnings.
A pass-through entity is not a separate taxpayer for income tax purposes. The business calculates its profit, allocates that profit among its owners, and reports each owner’s share to them and to the IRS. The owner picks up that share on their Form 1040 and pays tax at individual rates. The entity itself pays nothing federally.
Most pass-through entities still file an information return, Form 1065 for partnerships and Form 1120-S for S corporations. But these returns report and allocate rather than compute a tax liability. A sole proprietorship does not even do that; it reports on Schedule C within the owner’s personal return.
The part that surprises owners: phantom income
You are taxed on your allocated share of profit, not on what you actually received.
If your business earns $200,000 and you own half, you report $100,000 of income, even if the business distributed nothing and reinvested every dollar in inventory, equipment, or working capital. You will owe tax on money you never saw.
This is why well-drafted operating and shareholder agreements include tax distribution provisions requiring the entity to distribute at least enough for owners to cover the tax on their allocated share. Minority owners without that protection can find themselves with a tax bill and no cash, a situation that also affects how such interests are valued.
The Four Types of Pass-Through Entity
They share the tax principle but differ in formation, liability protection, ownership restrictions, and payroll tax exposure.
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Sole proprietorship
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Partnership
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LLC
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S corporation
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Formation
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Automatic
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Automatic on two or more owners
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State filing
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State filing plus IRS election
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Liability protection
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None
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None (general partners)
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Yes
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Yes
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Federal return
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Schedule C
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Form 1065
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Depends on election
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Form 1120-S
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Owner reports on
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Schedule C
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Schedule K-1
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Varies
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Schedule K-1
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Self-employment tax
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All net profit
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Generally all (active partners)
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Depends on election
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Salary only
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Ownership limits
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One owner
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None
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None
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100 shareholders; US individuals; one class of stock
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The LLC deserves a note, because it causes more confusion than the rest combined. An LLC is a state-law entity, not a federal tax classification. By default a single-member LLC is disregarded and taxed like a sole proprietorship, while a multi-member LLC is taxed as a partnership. But an LLC can elect to be taxed as an S corporation, or even as a C corporation, without changing its legal form at all. When people ask about setting up a US LLC, the tax election is usually the more consequential decision.
How the Money Flows: K-1s, Basis, and Distributions
Three concepts explain almost everything about pass-through mechanics.
The Schedule K-1 is the reporting document. Each partner or S corporation shareholder receives one showing their share of ordinary income, separately stated items such as capital gains and charitable contributions, and distributions received. The figures move onto the owner’s personal return.
Basis is the owner’s investment in the entity for tax purposes. It starts with what you contributed, increases with allocated income and additional contributions, and decreases with distributions and allocated losses. Basis does two jobs: it limits how much loss you can deduct, and it determines gain when you sell.
Distributions are generally not a second taxable event. Because you were already taxed on the income when it was allocated, taking the cash out is usually tax-free to the extent of basis. Distributions above basis produce capital gain.
The basis mechanic produces a real long-term benefit. Undistributed earnings raise your basis, which reduces your taxable gain when you eventually sell. A C corporation shareholder gets no equivalent, because retained earnings do nothing for shareholder basis. This is one of the reasons a pass-through interest can carry a higher value than an identical C corporation interest, and it is quantified in valuation work through the pass-through entity premium.
Self-Employment Tax: The Biggest Structural Difference
Income tax treatment is close to identical across all four pass-through forms. Self-employment and payroll tax is where they diverge, and it is where most of the money is.
Self-employment tax funds Social Security and Medicare. The rate is 15.3%, made up of 12.4% for Social Security and 2.9% for Medicare, applied to 92.35% of net earnings from self-employment.
For 2026 the Social Security portion applies only to the first $184,500 of earnings, a maximum of $22,878. Medicare has no ceiling. An additional 0.9% Medicare surtax applies above $200,000 for single filers and $250,000 for joint filers. Roughly half of the self-employment tax is deductible against income, which softens the blow but does not remove it.
A sole proprietor or an active general partner pays this on essentially all business profit. An S corporation shareholder pays payroll tax only on their salary. Profit distributed beyond that salary is not subject to Social Security or Medicare tax at all.
That is the entire basis of the S corporation strategy, and the reason the IRS scrutinizes it. Shareholders who provide services must pay themselves reasonable compensation for the work they actually do. Setting a $30,000 salary on $400,000 of profit is an audit invitation, and the IRS can recharacterize distributions as wages with penalties and interest attached. Reasonable compensation should be documented against comparable market salaries for the role, the hours, and the industry.
The Qualified Business Income Deduction
Section 199A lets owners of pass-through businesses deduct up to 20% of qualified business income. For an owner in the top bracket, that cuts the effective federal rate on business income from 37% to roughly 29.6%.
The One Big Beautiful Bill Act, signed in July 2025, made the deduction permanent, removing the sunset that had hung over every planning conversation since 2018, and widened the phase-in ranges from 2026.
For 2026 the thresholds are $403,500 of taxable income for joint filers and $201,750 for single filers. Below those figures the calculation is simple and all businesses qualify, service businesses included. Above them, two limitations arrive.
The first is the specified service trade or business restriction. Accounting, law, medicine, consulting, financial services, and similar fields lose the deduction entirely once taxable income reaches $553,500 joint or $276,750 single. The second is the W-2 wage and property limitation, which caps the deduction for non-service businesses based on wages paid and qualified property held.
OBBBA also introduced a minimum deduction of $400 for owners with at least $1,000 of qualified business income who materially participate, though this does not rescue SSTB owners who are fully phased out.
Two points that catch owners out. A salary paid to an S corporation shareholder is wage income, not qualified business income, so it does not qualify for the deduction. And C corporation income never qualifies, because the deduction exists only for pass-throughs.
Worked Example: The Same $300,000 Under Three Structures
A married couple filing jointly runs a business generating $300,000 of net profit, with no other income. Compare the payroll tax outcome across three structures for 2026.
As a sole proprietorship or single-member LLC
All profit is subject to self-employment tax. Net earnings are $300,000 × 92.35% = $277,050.
- Social Security: $184,500 (the 2026 wage base) × 12.4% = $22,878
- Medicare: $277,050 × 2.9% = $8,034
- Additional Medicare surtax: ($277,050 − $250,000) × 0.9% = $243
Total self-employment tax: $31,155
As a multi-member LLC or partnership
For an actively participating general partner the result is essentially the same, $31,155. Limited partners and certain passive LLC members may be able to exclude their distributive share from self-employment tax, but this is a contested area the IRS has litigated, and it should not be assumed.
As an S corporation
The couple pays a reasonable salary of $120,000 and takes the remaining $180,000 as a distribution.
- Social Security on salary: $120,000 × 12.4% = $14,880
- Medicare on salary: $120,000 × 2.9% = $3,480
- Distribution of $180,000: no Social Security or Medicare tax
Total payroll tax: $18,360
The honest net saving
The headline difference is $31,155 − $18,360 = $12,795. Most articles stop there. Two deductions from that figure belong in the analysis.
First, the QBI offset. As a sole proprietor, nearly the whole $300,000 (less the deductible half of self-employment tax) is qualified business income. As an S corporation, only the $180,000 distribution is, because the $120,000 salary is wage income. That difference of roughly $105,000 in QBI costs about $20,900 of deduction, which at a 24% marginal rate is roughly $5,000 of additional income tax.
Second, payroll administration. Running payroll, filing quarterly returns, and preparing Form 1120-S typically costs $1,500 to $3,000 a year more than a Schedule C.
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Amount
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Payroll tax saving
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$12,795
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Less: additional income tax from reduced QBI deduction
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(approx. $5,000)
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Less: payroll and filing administration
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($1,500 to $3,000)
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Realistic net annual benefit
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Approx. $4,800 to $6,300
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Still worth having, since roughly $5,000 a year is meaningful, but a long way from the $12,795 headline. And the calculation changes with profit level, salary, filing status, and whether the business is a specified service trade. Below about $60,000 of profit the S corporation election often costs more than it saves.
One further trade-off: a lower salary means lower Social Security earnings credited to your record, which reduces your eventual retirement benefit. For an owner in their fifties that is a real consideration.
When a C Corporation Is Actually the Better Answer
Pass-through treatment suits most small and mid-sized businesses, but not all. A C corporation makes sense in several situations.
If profits are being retained and reinvested rather than distributed, the 21% corporate rate can beat individual rates of up to 37%. The second layer of tax only arrives when money is actually paid out.
If you are raising venture capital, most institutional investors require a Delaware C corporation. Many funds cannot hold pass-through interests without generating problematic income for their tax-exempt partners.
Qualified small business stock under Section 1202 is available only for C corporation shares and can exclude a substantial amount of gain on a sale. For a company genuinely aiming at a large exit, this can outweigh years of double taxation.
And S corporations cannot have non-resident alien shareholders, which rules them out for many cross-border structures. A fuller treatment of the trade-offs appears in our S corp vs C corp comparison. Where a business has already been structured as a pass-through and needs to be valued, the tax difference is captured through the pass-through entity premium.
State Treatment Is Not the Same as Federal
Federal pass-through status does not automatically carry to the state level, and assuming it does is a common and expensive error.
Some states impose entity-level taxes on pass-throughs regardless of federal treatment. Others levy franchise or gross receipts taxes that apply irrespective of profitability. A handful do not recognize the S corporation election at all. Most states do not follow the federal qualified business income deduction, so state taxable income is often higher than federal.
There is also an elective regime worth knowing about. Most states now offer a pass-through entity tax election, which allows the entity to pay state income tax at the business level where it is fully deductible federally, sidestepping the individual cap on state and local tax deductions. It survived the 2025 legislation intact, though the higher SALT cap means it is no longer automatically worth electing.
Owners operating in more than one state face apportionment rules, filing obligations in each state where the business has nexus, and resident credit calculations that do not always work cleanly.
How to Elect S Corporation Status
The election is made on Form 2553, signed by all shareholders.
Timing is the trap. To be effective for a given tax year, the form must generally be filed no later than two months and fifteen days after the beginning of that year, which is March 15 for a calendar-year business. File later and the election usually takes effect the following year.
Late election relief is available under Revenue Procedure 2013-30 if there was reasonable cause and the business has otherwise behaved consistently with S corporation status. It is granted routinely enough to be worth pursuing, but relying on it is not a strategy.
The eligibility requirements are strict: no more than 100 shareholders, only individuals who are US citizens or residents plus certain trusts and estates, no partnership or corporate shareholders, and only one class of stock. Breaching any of these can terminate the election, sometimes retroactively.
Five Costly Mistakes
- Setting an indefensible salary. Too low invites recharacterization with penalties; too high wastes the entire benefit of the election. Document the basis for the figure.
- Ignoring basis limits on losses. You cannot deduct a loss beyond your basis. Suspended losses carry forward, but owners frequently claim deductions they are not entitled to and face adjustment later.
- Missing the election window. The March 15 deadline passes quietly, and an entire year of payroll tax saving goes with it.
- Assuming state conformity. Federal S corporation status does not guarantee state recognition, and franchise taxes apply whether or not there is profit.
- Underpaying estimated taxes. Pass-through income arrives without withholding. Owners must make quarterly payments or face underpayment penalties. This is a recurring problem for first-year owners, and one reason outsourced bookkeeping and tax preparation pays for itself for many small businesses.
Would your reasonable salary survive a challenge?
Countsure runs the payroll tax and QBI comparison on your actual numbers, documents reasonable compensation against comparable market salaries, and files the Form 2553 election. You get the workings behind the recommendation, not just the recommendation.
Frequently Asked Questions
1. What is a pass-through entity?
A pass-through entity is a business that does not pay federal income tax at the entity level. Its profits pass through to the owners, who report their share on their personal tax returns and pay tax at individual rates. Sole proprietorships, partnerships, most LLCs, and S corporations are pass-through entities. C corporations are not.
2. Is an LLC a pass-through entity?
By default, yes. A single-member LLC is disregarded and taxed like a sole proprietorship; a multi-member LLC is taxed as a partnership. However, an LLC can elect to be taxed as an S corporation or a C corporation. If it elects C corporation treatment it is no longer a pass-through for tax purposes, even though it remains an LLC under state law.
3. Do pass-through entities pay any taxes?
They pay no federal entity-level income tax, but they are not tax-free. Owners pay income tax on their allocated share, and often self-employment tax as well. Many states impose entity-level franchise, gross receipts, or income taxes on pass-throughs. Employment taxes on staff apply regardless of entity type.
4. How are pass-through entities taxed?
The entity calculates its profit and allocates it among owners, reporting each share on a Schedule K-1 (or Schedule C for a sole proprietorship). Owners include that amount on their personal return and pay tax at individual rates, potentially reduced by the 20% qualified business income deduction. Tax is due on the allocated share whether or not cash was distributed.
5. What is the qualified business income deduction?
The Section 199A deduction allows owners of pass-through businesses to deduct up to 20% of qualified business income, reducing the top effective federal rate on that income from 37% to about 29.6%. It was made permanent in 2025. For 2026 it begins to phase out at $403,500 of taxable income for joint filers and $201,750 for single filers, with additional restrictions for specified service businesses.
6. Should I elect S corporation status for my LLC?
It depends mainly on profit level. The election saves self-employment tax on profit distributed beyond a reasonable salary, but adds payroll costs and reduces qualified business income. As a rough guide, the election starts making sense once profit consistently exceeds a reasonable owner salary by around $80,000, though the threshold is lower for service businesses already phased out of the QBI deduction.
7. Can a non-US person own a pass-through entity?
Non-resident aliens cannot be S corporation shareholders, because that would terminate the election. They can generally hold interests in LLCs and partnerships, though this creates US filing obligations, potential withholding on effectively connected income, and treaty considerations. Cross-border ownership should be structured deliberately rather than by default.
8. What happens if my business loses money?
Losses generally pass through to owners and may offset other income, subject to three sets of limits: basis limitations, at-risk rules, and passive activity rules. Losses exceeding these limits are suspended and carried forward until basis or income allows them to be used.
Getting the Structure Right
A pass-through entity is the default for good reason: one layer of tax, a 20% deduction on qualified business income, and basis build-up that reduces gain on an eventual sale. But the four pass-through forms are not interchangeable, the self-employment tax difference between them is significant, and the right answer changes as a business grows. The structure that was obvious when you were making $60,000 of profit is rarely the structure that fits at $300,000. Treat entity choice as a live decision you revisit, not a box you ticked at formation.
- Budget for tax on profit you never received. Put a tax distribution provision in the operating or shareholder agreement before it is needed, not after the first surprise bill.
- Run the S corporation math on your own numbers. Subtract the lost QBI deduction and the payroll administration cost from the headline payroll tax saving before deciding.
- File Form 2553 by March 15 for a calendar-year business. Late relief under Rev. Proc. 2013-30 exists, but treating it as the plan is how a year of saving disappears.
- Document reasonable compensation against comparable market salaries for the role, the hours, and the industry, before the first payroll run rather than during an examination.
- Check your state separately. Franchise taxes, non-conformity with the QBI deduction, and states that ignore the S corporation election all apply regardless of federal status.
Get those five right and entity selection stops being a decision you second-guess every filing season.
Reviewing a structure set up years ago?
Countsure works with US and cross-border business owners on entity selection, S corporation elections, multi-state compliance, and the tax planning that follows. Whether you are forming a business, considering an election, or reviewing a structure set up years ago, we can help you work through it.
Parth Shah, Managing Director
(CPA-US, FCA, RV-S&FA, DISA)
Parth Shah who is head of Accounts and Book keeping has experience of more than 10 years. A Certified Public Accountant – US, fellow Chartered Accountant, Registered Valuer and Diploma in Information System Audit.
