Why pass-through taxation became the dominant small business model
The pass-through entity concept emerged from a longstanding tension in the US tax code: the double taxation of C corporation profits (taxed at the entity level and again when distributed as dividends) was widely seen as a penalty on small business investment. Partnerships and sole proprietorships had always enjoyed pass-through treatment — their income flowed directly to owners’ personal returns — but they lacked the liability protection of corporations.
The S corporation election (1958) and the LLC structure (formalized federally in 1997) each addressed this by allowing businesses to combine liability protection with pass-through taxation. By the time Congress passed the Tax Cuts and Jobs Act of 2017 — which added the Section 199A qualified business income deduction — pass-through entities had become the dominant form for small and mid-market businesses. The IRS estimates that pass-through entity income represents the majority of all business income reported in the United States, with S corporations and partnerships together far outnumbering C corporations in entity count.
What is a pass-through entity?
A pass-through entity is a business structure whose income, losses, deductions, and credits flow through to the owners’ personal tax returns rather than being taxed at the entity level. The business itself pays no federal income tax. Income is taxed once — at the owner’s individual rate — rather than twice as with C corporation dividends.
The four main pass-through entity types are sole proprietorships, partnerships, S corporations, and LLCs not electing corporate taxation. Each passes income through differently — sole proprietors report on Schedule C, partnerships issue K-1s from a Form 1065 filing, and S corporations issue K-1s from a Form 1120-S filing — but all share the defining feature: no entity-level federal income tax on operating income.
The four types of pass-through entities
| Entity type | Tax return filed | Owner reports on | SE tax applies |
|---|---|---|---|
| Sole proprietorship | None (Schedule C on owner 1040) | Schedule C + SE | Yes — all net income |
| Partnership | Form 1065 | Schedule K-1 on personal 1040 | Yes — active partners |
| S corporation | Form 1120-S | Schedule K-1 on personal 1040 | Only on wages, not distributions |
| LLC (disregarded) | None (Schedule C on owner 1040) | Schedule C + SE | Yes — all net income |
| LLC (partnership tax) | Form 1065 | Schedule K-1 on personal 1040 | Yes — active members |
| LLC (S-corp election) | Form 1120-S | Schedule K-1 on personal 1040 | Only on wages, not distributions |
How pass-through income is taxed
Pass-through income is reported on the owner’s personal income tax return and taxed at the owner’s individual federal income tax rate — 10%, 12%, 22%, 24%, 32%, 35%, or 37% depending on total taxable income. This is the key distinction from C corporation dividends, which are taxed at preferential qualified dividend rates (0%, 15%, or 20%) but only after the income has already been taxed at the 21% corporate rate.
Self-employment tax. Active owners of sole proprietorships, partnerships, and LLCs not electing S corporation treatment also pay self-employment tax — the self-employed equivalent of FICA. The SE tax rate is 15.3% on net self-employment income up to the Social Security wage base ($176,100 for 2025), and 2.9% (Medicare only) above that. S corporation shareholders avoid SE tax on distributions above reasonable compensation, which is the primary tax advantage of electing S corporation treatment for profitable pass-through businesses.
Section 199A QBI deduction. The Tax Cuts and Jobs Act of 2017 added Section 199A, which allows eligible pass-through entity owners to deduct up to 20% of their qualified business income (QBI) from their taxable income. For a business owner in the 24% bracket with $200,000 in QBI, the deduction reduces taxable income by $40,000 — saving $9,600 in federal income tax. The deduction is subject to income thresholds and is limited or eliminated for specified service trades or businesses (SSTBs) — including health, law, consulting, and financial services — at higher income levels. This deduction applies only to pass-through entities, not C corporations.
State-level pass-through entity tax (PTET)
Following the 2017 TCJA cap on the state and local tax (SALT) deduction at $10,000 for individuals, many states enacted pass-through entity tax (PTET) regimes. Under a PTET, the pass-through entity pays state income tax at the entity level — which is deductible for federal purposes without the $10,000 cap — and owners receive a credit on their state personal returns. This structure effectively restores some of the lost SALT deduction for pass-through entity owners.
Over 30 states have enacted PTET regimes as of 2026. The rules vary significantly: some states make the election mandatory for all pass-through entities, others make it optional and require unanimous member consent. CPA firms advise on whether the PTET election is beneficial for each client’s specific situation, and offshore accounting teams must ensure the entity-level PTET payment and the related owner credits are correctly recorded.
How pass-through entities are handled in QuickBooks and Xero
- Sole proprietorships and single-member LLCs. Income and expenses in QBO or Xero flow to Schedule C on the owner’s 1040. Owner draws are equity transactions, not expenses. No entity-level tax entries required.
- Partnerships and multi-member LLCs. Each member has a capital account in the equity section. Guaranteed payments to partners are an expense; other distributions are equity transactions. The year-end balance of each member capital account feeds into the K-1 reporting. QBO or Xero provides the income and expense data; the CPA firm prepares the 1065 and K-1s.
- S corporations. Owner wages through payroll (an expense); distributions through equity (not an expense). The CPA firm prepares the 1120-S and K-1s using QBO or Xero data.
- PTET payments. When the entity elects and pays a state PTET, the payment is recorded as a tax expense at the entity level in QBO or Xero. The corresponding owner credit is tracked separately and reported on the K-1 for each owner. This is a nuanced accounting treatment that requires CPA firm guidance on the specific state rules.
How CPA firms serve pass-through entity clients
Pass-through entities represent the majority of small business clients in most CPA practices. The core annual work is the entity return (1065 or 1120-S) and K-1 preparation, plus coordination with each owner’s personal return to ensure all pass-through items are reported correctly. Beyond compliance, the CPA firm advises on entity structure (is the current structure optimal for the business’s profitability and exit plans?), the Section 199A QBI deduction (how to maximize eligibility), PTET elections, and basis planning (ensuring owners maintain adequate basis to deduct losses).
For clients with multiple pass-through entities — a common structure for real estate investors and multi-business owners — the CPA firm coordinates the K-1s from each entity and manages the interaction of passive activity rules, at-risk rules, and basis limitations across the owner’s entire portfolio.
How pass-through entities work in offshore accounting
Pass-through entities are the most common structure the offshore accounting team encounters when serving US small business clients through CPA firms. The bookkeeping fundamentals are entity-type neutral — revenue, expenses, payables, receivables, and fixed assets are recorded the same way regardless of whether the entity is a sole proprietorship, partnership, or S corporation. What differs by entity type is the equity structure, owner compensation treatment, and the absence of entity-level income tax entries — and these differences define the specific disciplines the offshore team must apply.
The most consequential discipline for all pass-through entities is owner compensation vs. distributions vs. expense. These are three distinct accounting treatments that must not be conflated. Owner wages (for S corporation shareholder-employees) are a payroll expense that appears on the income statement and reduces taxable income at the entity level. Owner distributions are equity transactions that reduce the equity section and are not an expense — they do not reduce the entity’s taxable income. Personal expenses paid by the business are neither wages nor distributions; they are either legitimate business expenses (coded to expense accounts if genuinely business-related) or owner draws (coded to equity if personal). An offshore team that defaults ambiguous payments to expense accounts inflates deductions, suppresses reported income, and creates misstatements that the CPA firm has to untangle at year-end.
For partnerships and multi-member LLCs, the equity discipline extends to per-member capital accounts. Each member must have their own capital account that accumulates their contributions, their share of income and losses, and their distributions separately. The CPA firm relies on accurate per-member capital account balances to prepare K-1s, to advise members on their basis for loss deductibility, and to calculate the tax consequences of a member joining or exiting. An offshore team that tracks all member equity in a single combined account forces the CPA firm to reconstruct per-member history from scratch at year-end — a significant and avoidable burden.
What the offshore team does not do is determine the entity structure, advise on whether the PTET election is beneficial, calculate the Section 199A QBI deduction, or track owner basis across multiple entities. These are CPA firm advisory and tax compliance matters. The team maintains the books accurately under whatever structure is in place — that is its specific and consequential contribution.
What are the common misconceptions about pass-through entities?
- “Pass-through entities pay no taxes.” The entity pays no federal income tax, but the owners do — at their individual rates, often with self-employment tax on top. The tax does not disappear; it just moves to the owner level.
- “Pass-through income is always taxed at a lower rate than C corporation income.” Not necessarily. A high-income owner in the 37% bracket may pay more total tax on pass-through income than a C corporation owner who retains earnings at the 21% corporate rate. The comparison depends on income level, distribution plans, and exit strategy.
- “The Section 199A deduction applies to all pass-through income.” It applies to qualified business income from eligible activities. It is limited or phased out for specified service trades or businesses (SSTBs) at income above threshold levels, and it does not apply to W-2 wages, guaranteed payments, or certain investment income. The calculation requires CPA firm involvement for anything beyond the simplest situations.
- “Pass-through losses can always be deducted against other income.” Pass-through losses are subject to three separate limitation systems: the basis limitation (cannot deduct more than your basis), the at-risk limitation (cannot deduct more than amounts at risk), and the passive activity limitation (passive losses can only offset passive income, not wages or portfolio income). Deducting a pass-through loss without understanding all three limits can result in errors on the personal return.
What terms are commonly confused with pass-through entity?
| Confused with | The key difference |
|---|---|
| C corporation | C corporations pay entity-level tax at 21% and distribute after-tax profits as dividends taxed again at the individual level. Pass-through entities pay no entity-level tax — income flows directly to owners |
| S corporation | An S corporation is one specific type of pass-through entity with strict eligibility rules. All S corporations are pass-through entities; not all pass-through entities are S corporations |
| Flow-through entity | Flow-through entity is a synonym for pass-through entity — the terms are interchangeable in US tax practice |
| Tax-exempt entity | A tax-exempt entity (nonprofit, 501(c)(3)) pays no tax because its purpose qualifies for exemption. A pass-through entity pays no entity-level tax because income is taxed at the owner level instead. The mechanisms and eligibility rules are entirely different |
Common client questions about pass-through entities
What are the main types of pass-through entities?
The main types are sole proprietorships (Schedule C), partnerships (Form 1065 + K-1s), S corporations (Form 1120-S + K-1s), and LLCs depending on elections and member count. The common feature is that income is taxed once, at the owner’s individual rate, rather than twice as with C corporation dividends.
How is pass-through income taxed?
Pass-through income is reported on the owner’s personal income tax return and taxed at the owner’s individual income tax rate. Active owners of sole proprietorships, partnerships, and LLCs also pay self-employment tax on net income. S corporation shareholders avoid SE tax on distributions above reasonable compensation. The Section 199A QBI deduction allows eligible pass-through owners to deduct up to 20% of qualified business income.
What is the Section 199A QBI deduction?
Section 199A allows eligible pass-through entity owners to deduct up to 20% of their qualified business income from taxable income. The deduction is subject to income limitations and is phased out or reduced for certain service businesses at higher income levels. It applies only to pass-through entities, not C corporations.
What is the difference between pass-through income and dividend income?
Pass-through income flows directly from the business to the owner and is taxed at ordinary income rates, generally with self-employment tax for active owners. Dividend income is a distribution from a C corporation after the corporation has already paid 21% corporate tax — dividends are then taxed again at preferential qualified dividend rates (0%, 15%, or 20%). Pass-through income is taxed once; dividend income represents a second tax on income already taxed at the corporate level.
Is pass-through taxation always better than C corporation taxation?
Not necessarily. For businesses that retain most earnings for reinvestment, the 21% corporate rate may be lower than the owner’s individual rate. Businesses planning exits benefiting from the Section 1202 QSBS exclusion may prefer C corporation status. Pass-through taxation tends to be more efficient for businesses that distribute most profits and whose owners are in tax brackets below the combined corporate plus dividend rate. The right answer depends on the specific situation and requires CPA firm analysis.
