Why Entity Structure Is More Consequential for Contractors
For most businesses, choosing between an LLC and an S-Corp is primarily a tax conversation. For construction contractors, the stakes are higher. Your entity structure affects bonding capacity, banking relationships, equipment financing, liability exposure on project sites, and your ability to retain capital for equipment purchases or business acquisition.
A $4M general contractor paying $47,000 per year in excess self-employment taxes because nobody had explained that his single-member LLC was taxed identically to a sole proprietorship -- a one-page IRS Form 2553 election fixes most of that. But entity structure decisions can also go wrong: contractors who elect S-Corp without maintaining adequate equity on their balance sheet sometimes find their bonding limits cut at exactly the wrong time.
The right structure depends on your revenue, your profitability, your growth trajectory, and whether you own equipment or real estate through the business. This guide covers each structure with the specificity that decision actually requires.
The LLC: Protection Without a Tax Strategy
A limited liability company provides personal liability protection from business debts and claims, which matters in construction where job site injuries and contract disputes are common. But an LLC's default federal tax treatment is often misunderstood.
A single-member LLC is taxed as a sole proprietorship by default. All net income flows to Schedule C and is subject to both income tax and self-employment tax -- currently 15.3% on the first $168,600 of net earnings and 2.9% above that. A multi-member LLC defaults to partnership taxation, filing Form 1065, with each member's share subject to self-employment taxes on active income. Neither structure provides any mechanism to reduce that SE tax burden.
For a contractor netting $250,000, the difference between LLC and S-Corp taxation can be $15,000-$25,000 annually. At $500,000 net income, the gap widens further. The LLC is not a tax strategy; it is a legal vehicle. Many contractors operate as LLCs for years without realizing they are paying the maximum possible self-employment tax load on every dollar of profit.
Where the LLC excels: simplicity, low maintenance costs, and flexibility. An LLC has no requirements for annual meetings, formal resolutions, or maintained corporate formalities. For a solo contractor generating under $80,000 in net profit, the S-Corp conversion costs (payroll, additional tax filings, accounting fees) often outweigh the savings. But past that threshold, the calculus shifts decisively.
The S-Corp Election: Standard Issue for Contractors Under $10M
The S-Corp is not a separate legal entity -- it is a tax election. You can operate as an LLC and elect to be taxed as an S-Corp by filing Form 2553 with the IRS. Most contractors who "form an S-Corp" actually form an LLC or corporation and then elect S-Corp status for tax purposes.
The core benefit is straightforward: as an S-Corp, you pay yourself a "reasonable salary" as a W-2 employee. Payroll taxes apply only to that salary, not to distributions. Profits above your salary pass through as distributions, free of self-employment tax.
Consider a $3M electrical contractor netting $400,000. As a default LLC, all $400,000 is subject to SE taxes, costing approximately $42,000 in 2026 (15.3% on the first $168,600, plus 2.9% above). As an S-Corp with a $150,000 reasonable salary, FICA taxes apply to $150,000 only, saving roughly $20,000-$25,000 annually. The IRS requires the salary to be "reasonable" -- for a working owner of a $3M GC, that benchmark lands between $100,000 and $175,000 depending on your market and role.
The S-Corp has real administrative overhead: payroll, quarterly 941s, W-2s, a separate 1120-S federal return, and state-level S-Corp compliance. This adds $3,000-$8,000 per year in accounting and payroll costs. Budget for that offset when calculating your net tax savings.
One important constraint: S-Corps can only have one class of stock and a maximum of 100 shareholders, all of whom must be U.S. citizens or residents. For most owner-operated contractors, this is not a constraint. But if you are planning to bring in investors or structure equity across different classes, the S-Corp's rigidity becomes a real problem.
The C-Corp: Rarely Right for Construction, But Here's When
A C-Corp is the default corporate structure -- a separate taxpaying entity. Profits are taxed at the corporate rate (currently 21%), and distributions to shareholders are taxed again as dividends (qualified dividends taxed at 15-20% for most owners). This "double taxation" structure is why most pass-through businesses avoid it.
For construction contractors, the C-Corp is almost never the optimal base structure. Construction businesses typically run 5-10% net margins for general contractors and 8-15% for specialty trades. Those margins get eroded fast when every dollar of profit is taxed twice before it reaches the owner's pocket.
There are three scenarios where C-Corp structure makes sense for contractors:
Scenario 1: PE or institutional capital. If you are raising private equity, selling to a strategic buyer, or attracting institutional capital, a C-Corp is often expected. The C-Corp's ability to offer multiple stock classes, stock option plans, and clean cap table mechanics makes it the preferred vehicle. If your $15M roofing company is on a path toward a PE roll-up or strategic acquisition in the next 3-5 years, a C-Corp election may make sense to structure the deal cleanly.
Scenario 2: High retained earnings for capitalization. A C-Corp taxed at 21% can retain earnings at a lower initial tax rate than pass-through income taxed at 32-37% for a high earner. If you are intentionally capitalizing the business -- buying equipment, funding a bonding cash reserve, or building out an equipment yard -- retaining income inside a C-Corp can be tax-efficient. The catch: when you eventually extract that money, you pay dividend taxes, and the total effective rate often converges with or exceeds pass-through rates over a full cycle.
Scenario 3: Qualified Small Business Stock. Qualified Small Business Stock (QSBS) under Section 1202 allows C-Corp shareholders to exclude up to $10M (or 10x basis) in capital gains when selling shares held for more than five years. If you are building a specialty contractor to sell, QSBS treatment can be transformative -- but it requires C-Corp status from the outset or well before the sale.
The bottom line: for a contractor doing under $10M with no outside investors and no near-term exit, the C-Corp rarely pencils out. But it is not a structure to dismiss if your exit or capitalization goals fit the scenarios above.
Bonding Capacity: The Entity Structure Factor Most CPAs Ignore
Surety bonding is a core requirement for public contracts and many commercial GC relationships. Bonding companies underwrite based on your financial capacity -- specifically, your working capital, net worth, and the quality of your financial statements. Your entity structure and distribution behavior affect all three.
When you convert from a default LLC to an S-Corp, you are not changing your legal structure -- you are changing your tax treatment. Your balance sheet does not change on conversion day. However, the timing and aggressiveness of post-election distributions can significantly affect how bonding underwriters read your financials.
The key bonding ratios to protect during any entity structure transition:
- Working capital ratio: Current assets divided by current liabilities, typically 1.2:1 or better for GC bonding. - Net worth: Total equity on the balance sheet. Bonding companies typically require $150,000-$250,000 minimum net worth for single bonds over $1M. - Debt-to-equity: Keep this under 3:1 during any transition period.
S-Corp owners sometimes drain equity via distributions in ways they would not in a C-Corp, precisely because distributions are not taxed at the entity level. But your bonding agent reads your balance sheet -- heavy distributions that reduce equity to near zero will trigger bonding capacity questions. A $5M contractor with $200,000 in net worth can get bonded; that same contractor with $25,000 in net worth after aggressive distributions may find its single-bond limit cut significantly.
Before converting your entity or changing your distribution strategy, consult with your bonding agent. Many surety companies will ask for an explanation of significant structural changes between fiscal years. Coordinate this proactively, not after the bonding application is already in review.
Equipment and Real Estate: The Multi-Entity Strategy
The most common structural blind spot in contractors doing $3M-$15M: everything -- operating business, equipment, real estate, vehicles -- sits in one entity. This creates unnecessary liability exposure and misses significant tax optimization opportunities.
The standard construction multi-entity structure works like this:
Operating company (OpCo): An LLC or S-Corp that holds the contractor's license, employs workers, executes contracts, and generates operating income. This entity maintains bonding capacity and banking relationships.
Equipment holding company: A separate LLC that owns heavy equipment -- cranes, excavators, concrete trucks, specialty machinery. The equipment LLC leases assets to the OpCo at market rate. This creates two benefits: the equipment is protected from OpCo's project liability, and the lease payments create a deduction for OpCo while generating income (and depreciation opportunities) in the equipment entity.
Real estate holding company: If you own your yard, shop, or office space, put it in a separate LLC. Real property is a long-lived asset that should not be exposed to the operating risks of a construction business. A mechanic's lien on a disputed project should not threaten your $2M equipment yard.
This structure also creates flexibility at exit. When you eventually sell the operating business, the buyer typically wants the license, contracts, and workforce -- not the real estate or equipment. Separate entities allow you to retain those assets and generate ongoing rental income after the sale of the operating company. A well-structured multi-entity setup can meaningfully increase the total value you realize from a sale compared to a bundled single-entity transaction.
Revenue Thresholds: When to Change Your Structure
Entity structure decisions should be revisited at specific revenue and profitability milestones, not just once at startup.
Under $80K net profit: Operate as a single-member LLC. The S-Corp's administrative overhead -- payroll processing, 1120-S filing, state franchise fees -- typically exceeds the SE tax savings. Focus on building revenue.
$80K-$300K net profit: Elect S-Corp status. The tax savings are real, typically $8,000-$25,000 annually, and justify the additional overhead. Set a reasonable salary between $70,000 and $120,000 depending on your role and market.
$300K-$1M net profit: S-Corp remains optimal for most contractors. Revisit your reasonable salary annually and adjust it upward as profit grows. Begin evaluating whether the equipment and real estate separation strategy applies to your situation.
$1M+ net profit (or $5M+ in revenue): At this scale, multi-entity structures become worth the complexity. Review whether a HoldCo/OpCo structure makes sense for asset protection and management control. If you have outside investors or are preparing for a capital event, evaluate whether a C-Corp election better serves your goals.
Above $10M revenue with PE on the horizon: Bring in transaction advisory support before making entity structure decisions. The cost of restructuring improperly during M&A can wipe out years of accumulated tax savings.
The Tax Math: Real Numbers for a $3M Contractor
Here is a specific model. You are a $3M specialty electrical contractor operating as a single-member LLC. Net profit is $320,000 after all operating expenses. You are a single filer in the 32% federal income tax bracket.
As a default LLC (Schedule C): - SE tax on first $168,600: $25,796 - SE tax on remaining $151,400 at 2.9%: $4,391 - Total SE tax: approximately $30,187 - Deductible SE tax (50%): $15,094 - Adjusted net income: $304,906 - Federal income tax at 32%: approximately $97,570 - Total federal tax burden: approximately $127,757
As an S-Corp with $140,000 reasonable salary: - Combined FICA on $140,000 (employer + employee): approximately $21,420 - Remaining $180,000 distributed with no FICA - Federal income tax on $320,000 pass-through income: approximately $97,570 - Total federal tax burden: approximately $118,990 - Annual savings: approximately $8,800 in this scenario
At $500,000 net profit with a $175,000 salary, annual savings typically reach $25,000-$35,000. At $800,000 net with a $200,000 salary, savings exceed $40,000. The math compounds over a decade into real, compounding capital retained in your pocket rather than paid to the IRS.
These figures are illustrative. Your actual savings depend on your state's tax rates, whether your income qualifies for the 20% pass-through deduction under Section 199A (which phases out at $197,300 for single filers in 2026), your retirement contributions, and other deductions. Run your specific numbers with a CPA who understands contractor financials before filing Form 2553.
Mistakes to Avoid When Making the Switch
Filing Form 2553 without a payroll system in place. The IRS expects you to have been paying yourself a salary from the effective date of the election. If you elect S-Corp status in January and do not run payroll until November, you have an inconsistency that can invite scrutiny. Set up payroll before or simultaneously with the election.
Setting salary too low. The IRS has successfully challenged S-Corp elections where owners paid themselves $30,000 while taking $700,000 in distributions. A contractor doing $3M in revenue and netting $400,000 should not be paying themselves $40,000. The "reasonable compensation" standard is scrutinized when the ratio of distributions to salary is extreme.
Failing to update your contractor's license. Some states require license updates when you change your business entity structure. California's CSLB, for example, ties licenses to specific legal entities. Converting from an LLC to a corporation can require a new license application or qualifier update. Check your state licensing board before filing anything.
Neglecting state-level implications. S-Corp status is recognized by most states, but not all treat it identically to the federal treatment. California charges an additional franchise tax on S-Corps of 1.5% of net income with an $800 minimum. Factor state-specific taxes into your savings calculation before converting.
Timing the election incorrectly. To elect S-Corp status for the current tax year, Form 2553 must generally be filed by March 15 for calendar-year entities. Missing the deadline means waiting until the following year, or filing with a valid reason for late relief. Plan 60-90 days ahead and coordinate with your accountant and bonding agent before filing.
Conclusion
Entity structure is not a set-it-and-forget-it decision. The right structure at $500,000 in revenue is often wrong at $3M, and what works at $3M may need to be redesigned at $10M. For most contractors operating between $500K and $10M, the S-Corp election delivers meaningful and compounding tax savings with manageable administrative overhead.
The variables that change this calculus -- bonding capacity, equipment ownership, real estate, outside investors, exit planning -- are contractor-specific, and the wrong structure can cost more than the taxes you saved. If you are unsure whether your current entity structure is optimized for your revenue and growth stage, Northstar's fractional CFO team works with construction clients to design multi-entity structures that protect assets, reduce taxes, and keep bonding capacity intact as you scale.