This analysis is educational and not tax or legal advice; all federal figures reflect tax year 2026 under IRS Revenue Procedure 2025-32 and the One Big Beautiful Bill Act, and entity choice should be confirmed with a licensed CPA or tax attorney before filing.
TL;DR — Quick Verdict
- At $180,000 of net profit, the self-employment tax gap between a default LLC and an S-corp election runs roughly $8,300 per year before compliance costs — about $83,000 across a decade.
- S-corp compliance eats $1,200–$3,500 annually in Form 1120-S preparation alone, plus payroll processing, so the election rarely clears breakeven below roughly $60,000–$80,000 of profit.
- The 2026 self-employment tax applies 12.4% Social Security only to the first $184,500 of net earnings; above that ceiling, the S-corp advantage collapses to the 2.9% Medicare spread.
- A C-corp distributing all profit faces 21% at the entity plus 0%–20% qualified dividend tax plus 3.8% NIIT — a combined federal burden that can reach 39.8%, versus a single layer for pass-throughs.
- Section 199A survived permanently under OBBBA, and its $201,750 single / $403,500 married-filing-jointly thresholds now drive entity choice more than the payroll-tax math does.
- Recommendation: model 10 years, not one. Run the S-corp election only after profit clears $80,000 and stays there; treat C-corp status as a capital-raising or retained-earnings decision, not a tax-savings one.
A solo consultant earning $180,000 in net profit will pay the federal government somewhere between $41,000 and $59,000 in 2026 depending on nothing more than which box was checked on a form. Same revenue. Same clients. Same expenses. The spread comes entirely from entity classification and how the owner takes money out.
Most entity-choice advice stops at the first-year comparison, which is exactly where it fails. Formation is a one-time cost; classification is a recurring one, compounding for as long as the business operates. A $4,200 annual difference sounds trivial in isolation and becomes $42,000 over the life of a small practice — before accounting for the compliance overhead that platforms like Gusto, ADP, and Bench charge to keep an S-corp legal.
The Internal Revenue Service reports that the 15.3% self-employment tax applies to net earnings of $400 or more, with the 12.4% Social Security portion capped at $184,500 of net earnings for 2026 per the Social Security Administration. That ceiling is the single most important number in this entire comparison, and almost no entity-choice calculator explains why.
What follows is a ten-year cost model across four structures at three profit levels, the actual compliance line items, the breakeven point, and the conditions under which each structure stops making sense.
The 2026 Federal Tax Inputs That Drive Every Entity Comparison
Four federal parameters determine nearly the entire outcome. Everything else is rounding.
Self-employment tax hits pass-through owners at 15.3% on 92.35% of net profit — 12.4% for Social Security up to $184,500, then 2.9% for Medicare with no ceiling, plus an additional 0.9% Medicare surtax above $200,000 single or $250,000 married filing jointly. Half the self-employment tax is deductible above the line, which softens but does not eliminate the hit.
Section 199A survived what was supposed to be a 2025 sunset. The One Big Beautiful Bill Act made the 20% qualified business income deduction permanent and widened the phase-in bands beginning in 2026, from $50,000 to $75,000 for single filers and from $100,000 to $150,000 for joint filers. Owners of specified service trades or businesses — law, health, accounting, consulting, financial services — lose the deduction entirely above the upper threshold.
Sources: IRS Revenue Procedure 2025-32; Social Security Administration 2026 wage base announcement; IRC §199A as amended by OBBBA §70105. IRS 2026 inflation adjustments
Note the interaction most owners miss: the $184,500 Social Security ceiling and the $201,750 Section 199A threshold sit close together for single filers. A business crossing both in the same year experiences two rule changes simultaneously, and the direction of the entity recommendation can reverse.
Ten-Year Federal Cost Model: Four Structures, Three Profit Levels
Modeling one year hides the compounding. The table below holds profit flat, applies 2026 rules to every year, and reports cumulative federal tax plus compliance cost across a decade. Flat-profit modeling is deliberately conservative — it understates the S-corp advantage for growing businesses and overstates it for volatile ones.
Assumptions: single filer, standard deduction, no state income tax, S-corp reasonable salary set at 45% of profit, C-corp scenario distributes 100% of after-tax earnings as qualified dividends. Compliance costs use midpoint estimates from the ranges detailed in the next section.
Modeled by Real Cost Report using 2026 rate schedules. Rates and thresholds from IRS Revenue Procedure 2025-32 and Social Security Administration (verify at irs.gov and ssa.gov). Figures rounded to nearest $1,000; ten-year cumulative, flat profit, no inflation indexing applied to future years.
Three findings stand out. At $75,000, the S-corp election produces essentially no ten-year advantage — the payroll and preparation overhead consumes the entire payroll-tax saving. At $180,000, the S-corp saves approximately $48,000 across a decade net of compliance. At $400,000, the saving narrows in percentage terms because profit above $184,500 escapes the 12.4% Social Security portion regardless of entity, leaving only the 2.9% Medicare spread in play.
The C-corp column looks punishing because the model distributes everything. That assumption is the point: a C-corp that retains earnings tells a completely different story, covered below.
What the S-Corp Election Actually Costs to Maintain
Payroll-tax savings are gross, not net. The election creates a permanent annual expense structure that no calculator on a formation service’s website will show you upfront.
A separate corporate return is mandatory. The National Society of Accountants Income and Fees Survey and the National Association of Tax Professionals 2025 Fee Study both place Form 1120-S preparation well above Schedule C work, with market quotes in 2026 clustering between $1,200 and $3,500 for comprehensive preparation including reasonable-compensation analysis and shareholder basis tracking. Provider-specific 2026 data was unavailable for a single point figure, so this range reflects surveyed practitioner pricing rather than a measured national mean.
Compiled from National Society of Accountants Income and Fees Survey and published 2026 CPA firm pricing; payroll figures from vendor published tiers (verify at nsacct.org). Ranges are market observations, not a measured national average.
Run the breakeven honestly. At the low end of overhead, $2,500 annually, the election needs roughly $16,300 of distribution reclassified out of self-employment tax at 15.3% just to break even. That implies profit around $60,000 with an aggressive salary split, or closer to $80,000 with a defensible one. The LLC vs S-Corp tax savings by profit level analysis breaks this threshold down further, and the LLC to S-Corp conversion process and costs guide covers the one-time transition expense.
Miss the election window and the math delays a full year. The S-Corp election form, deadlines, and missed-deadline fixes reference explains late-election relief under the applicable revenue procedures.
S-Corp vs C-Corp: Which Is Better for a Business Retaining Profit?
Everything above assumed the owner takes the money out. Reverse that assumption and the ranking inverts.
Consider a software business netting $400,000 that reinvests $300,000 into engineering hires and infrastructure, distributing only $100,000. Under S-corp treatment, the owner is taxed on the full $400,000 of pass-through income regardless of what stays in the bank — a phantom income problem that forces distributions purely to cover tax. Under C-corp treatment, retained earnings are taxed once at 21% and the second layer is deferred until distribution or sale.
The arithmetic on retained profit: $300,000 taxed at 21% leaves $237,000 of deployable capital inside the corporation. The same $300,000 passing through to an owner in the 35% marginal bracket leaves roughly $195,000 after federal income tax, before any state layer. That $42,000 annual difference compounds directly into growth capital.
The C-corp penalty arrives at distribution. The Tax Policy Center describes the structure plainly: corporate income faces 21% at the entity, then qualifying dividends face a top rate of 20% plus the 3.8% net investment income tax at the shareholder level. Combined federal exposure on fully distributed profit reaches approximately 39.8%. The Internal Revenue Code also imposes an accumulated earnings tax on retained profit beyond the reasonable needs of the business, with a general credit around $250,000 and a lower amount for personal service corporations, so indefinite hoarding is not a free strategy.
Verdict
For a business distributing most profit to a working owner, the S-corp election wins decisively — the single layer of tax plus the payroll-tax reclassification beats 21% plus dividend tax at nearly every profit level. For a business retaining more than roughly 60% of profit for three or more consecutive years, or preparing to raise institutional capital or qualify stock under Section 1202, the C-corp’s 21% flat rate and deferred second layer produce more deployable capital. The deciding variable is not profit size. It is distribution ratio.
Where State-Level Costs Overturn the Federal Answer
Federal modeling produces a clean answer that a single state statute can destroy.
California imposes an $800 annual minimum franchise tax under Revenue and Taxation Code Section 17941 on every LLC organized or doing business in the state, regardless of profit or activity. LLCs additionally owe a gross-receipts fee under Section 17942 that runs $900 at $250,000 of gross receipts and rises to $11,790 above $5 million. A California S-corporation instead pays 1.5% of net income with the same $800 floor.
Those two regimes diverge sharply by margin profile. A low-margin distributor with $2 million in gross receipts and $150,000 of net income owes $6,800 as an LLC and roughly $2,250 as an S-corp — a $4,550 annual swing produced entirely by which base the state taxes. A high-margin consultancy with $400,000 gross and $320,000 net flips the comparison: $1,700 as an LLC versus $4,800 as an S-corp.
Formation-state arbitrage rarely solves this. An LLC organized in Delaware but operated from California owes Delaware’s franchise tax and California’s $800 plus the applicable gross-receipts fee, because neither credits the other. The Wyoming vs Delaware out-of-state formation costs comparison and the registering an LLC in another state guide cover why nexus, not filing address, controls. Owners should also price LLC formation filing fees and annual costs by state before committing, and factor registered agent service cost comparison into every state where the entity qualifies.
What Most People Get Wrong About Entity Tax Planning
Five errors account for most of the money lost, and none of them involve arithmetic.
Mistake one: treating the LLC as a tax structure. A single-member LLC is disregarded for federal income tax and taxed identically to a sole proprietorship. Consequence: owners form LLCs expecting tax savings that do not exist and are disappointed by an unchanged bill. Correct action: separate the liability decision from the tax decision, as the sole proprietor vs LLC liability and tax differences analysis details.
Mistake two: setting an unreasonably low S-corp salary. Reclassifying nearly all profit as distribution maximizes the payroll-tax saving and invites reclassification on audit. Consequence: back payroll taxes, penalties, and interest that exceed years of savings. Correct action: document comparable-market compensation for the role annually.
Mistake three: ignoring the Section 199A interaction. Raising S-corp salary reduces qualified business income dollar for dollar, shrinking the 20% deduction. Consequence: payroll-tax savings partially offset by lost deduction. Correct action: optimize salary against both taxes jointly, not sequentially.
Mistake four: assuming multi-member changes nothing. Partnership taxation introduces guaranteed payments, capital accounts, and allocation rules absent from single-member treatment. Consequence: mismatched K-1s and disputed allocations. Correct action: review single vs multi-member LLC tax treatment and paper the arrangement properly — the operating agreement attorney costs vs templates comparison shows where template documents fail.
Mistake five: believing the structure is permanent protection. Personal guarantees, commingled funds, and direct tortious conduct pierce the entity regardless of classification. Consequence: personal exposure the owner assumed was eliminated. Correct action: understand what limited liability protects and what it doesn’t before relying on it.
Who Should Actually Change Structure — and Who Should Not
Conditional logic beats general rules here, because the same profit figure supports opposite recommendations depending on three variables: distribution ratio, state of operation, and specified-service status.
Elect S-corp status if net profit has exceeded roughly $80,000 for two consecutive years, the owner distributes most of it, the business operates in a state without a punitive corporate-level tax, and books are clean enough that payroll reconciliation does not triple the bookkeeping bill. Under those four conditions the ten-year saving at $180,000 of profit approaches $48,000 net of compliance.
Stay in default LLC taxation if profit is volatile, under $80,000, or concentrated in a state where the gross-receipts fee structure favors LLC treatment. Volatility matters more than owners expect: an S-corp with mandatory payroll during a loss year still generates wage expense and payroll filings.
Choose C-corp status only under specific conditions — institutional fundraising, qualified small business stock planning, or sustained retention above 60% of profit. Absent those, the second layer of tax is a cost with no offsetting benefit.
Do nothing if the business is pre-revenue. Formation and compliance costs accrue immediately; tax savings require profit. The step-by-step LLC formation process and total cost and, when a structure has outlived its purpose, dissolving an LLC without residual liability both matter more to early-stage owners than the S-corp question does.
Frequently Asked Questions
Does the S-corp election reduce income tax or only payroll tax?
Only payroll tax. Pass-through income reaches the owner’s return either way and faces identical federal income tax brackets — 10% through 37% for 2026 under Revenue Procedure 2025-32. The election converts a portion of profit from self-employment earnings subject to the 15.3% self-employment tax into distributions exempt from it. Income tax liability is unchanged except through the secondary Section 199A effect of reducing qualified business income by the salary paid.
At what profit level does the S-corp election stop helping?
The advantage narrows sharply above $184,500 of net earnings, the 2026 Social Security wage base announced by the Social Security Administration. Beyond that ceiling only the 2.9% Medicare portion remains in play, plus the 0.9% Additional Medicare Tax above $200,000 single. The election still helps, but the marginal saving per dollar drops from 15.3% to roughly 3.8%, which compliance overhead can offset.
Did Section 199A expire at the end of 2025?
No. The One Big Beautiful Bill Act made the 20% qualified business income deduction permanent and widened the phase-in ranges beginning in 2026 — from $50,000 to $75,000 for single filers and $100,000 to $150,000 for joint filers. It also added a $400 minimum deduction where qualified business income reaches $1,000 and the owner materially participates. Thresholds for 2026 are $201,750 single and $403,500 married filing jointly.
Can forming in Wyoming avoid my home state’s franchise tax?
Generally no. States tax based on where business is conducted, not where the entity was organized. California’s Franchise Tax Board applies the $800 minimum under Revenue and Taxation Code Section 17941 to any LLC doing business in the state, including one formed in Delaware or Wyoming. The result is two sets of fees rather than one, plus foreign qualification costs and a second registered agent.
How We Researched This Article
Every federal figure in this analysis was drawn from primary sources published for tax year 2026. Bracket thresholds, the standard deduction of $16,100 single and $32,200 married filing jointly, and the Section 199A thresholds of $201,750 and $403,500 come from IRS Revenue Procedure 2025-32. The $184,500 Social Security wage base and the 15.3% self-employment tax structure come from the Social Security Administration’s annual announcement and IRS guidance on self-employment tax. Corporate rate and dividend treatment were verified against the Tax Policy Center briefing on corporate double taxation and Internal Revenue Code Section 1(h)(11). Inflation-adjustment methodology and bracket confirmation were cross-checked against Tax Foundation’s 2026 bracket analysis. California entity-level figures reflect Revenue and Taxation Code Sections 17941 and 17942 as administered by the California Franchise Tax Board (verify at ftb.ca.gov).
The ten-year cost model is modeled, not measured. It applies 2026 rates uniformly across all ten years rather than projecting future inflation adjustments, which understates nominal tax in later years but preserves the comparison between structures — the relative ranking is the finding, not the absolute dollar totals. Profit is held flat, state income tax is excluded from the federal table, and the S-corp salary is set at 45% of profit, a defensible but not universally applicable ratio.
Compliance cost ranges are the weakest data in this analysis and are presented as ranges for that reason. No federal agency publishes entity compliance costs. The $1,200–$3,500 Form 1120-S range synthesizes the National Society of Accountants Income and Fees Survey, the National Association of Tax Professionals 2025 Fee Study, and published 2026 CPA firm pricing; period-specific and provider-specific data for 2026 was not available from a single primary source. Readers should obtain local quotes rather than relying on the midpoint. Reasonable-compensation determinations, state nexus analysis, and Section 1202 qualification all require professional review that no model substitutes for. Research last conducted July 2026. All figures were verified against named primary sources before publication.