S Corp vs LLC for Contractors: Which Entity Structure Saves You More?

Choosing between an S corp and an LLC is one of the most expensive decisions a contractor makes, and most get advice from someone who has never looked at a job cost report. This guide breaks down the real difference between the two for construction businesses, how each one is taxed, and how to figure out which structure keeps more money in your pocket. By the end, you will know what actually drives the tax savings and at what point making the switch is worth it.

What Is the Difference Between an S Corp and an LLC?

The first thing to clear up is that an S corp and an LLC are not the same kind of thing, and treating them as a simple either-or is where most contractors get confused. An LLC, or limited liability company, is a legal entity you form at the state level. It protects your personal assets from business liability. An S corporation is not a legal entity at all. It is a tax election you make with the IRS using Form 2553.

That distinction matters because an LLC can choose how it is taxed. By default, a single-owner LLC is taxed as a sole proprietorship, and a multi-owner LLC is taxed as a partnership. But that same LLC can elect to be taxed as an S corp without changing its legal structure. So the real comparison is not LLC against S corp. It is an LLC taxed the default way against an LLC taxed as an S corp.

The legal protection is the same either way. Whether you are taxed as a sole proprietor, a partnership, or an S corp, the LLC shields your house, your truck, and your personal savings from a lawsuit against the business. What changes when you make the S corp election is how the IRS taxes the profit your construction company earns. That tax treatment is where the savings, and the added work, come from.

Why Entity Structure Matters for Contractors

Construction is a high-revenue, thin-margin business. A general contractor doing $4,000,000 a year might net $400,000 in profit. How that profit is taxed determines whether you keep a much larger or much smaller share of it. Entity structure is the lever that controls that. It sits alongside other classification decisions that carry real tax weight, like the tax and legal differences between subcontractors and employees.

Self-Employment Tax Is the Biggest Factor

When your LLC is taxed as a sole proprietorship or partnership, every dollar of net profit is subject to self-employment tax. That tax is 15.3 percent: 12.4 percent for Social Security and 2.9 percent for Medicare. The Social Security portion applies up to the 2026 wage base of $184,500, and the Medicare portion has no cap. On $400,000 of net profit, the self-employment tax alone runs well into five figures before you pay a single dollar of income tax.

An S corp changes this. As an S corp, you pay yourself a salary that is subject to payroll taxes, and the remaining profit comes to you as a distribution that is not subject to self-employment or payroll tax. That single difference is the core reason contractors elect S corp status. It can save thousands of dollars a year on the same profit.

The QBI Deduction Affects Both Structures

The qualified business income (QBI) deduction under Section 199A lets owners of pass-through businesses deduct up to 20 percent of qualified business income. Both default LLCs and S corps are pass-through entities, so both can claim it. Construction is treated as a qualified trade or business, not a specified service business, which means contractors generally keep access to the deduction even at higher income levels where doctors, lawyers, and consultants lose it.

The QBI deduction was made permanent under the One Big Beautiful Bill Act in 2025, so contractors can plan around it for the long term instead of guessing whether it will disappear. There is a catch worth knowing: the salary you pay yourself in an S corp counts as wages, not as qualified business income, so it does not get the 20 percent deduction. This creates a balancing act between lowering self-employment tax with a smaller salary and preserving the QBI deduction, which is exactly the kind of trade-off a construction tax strategy should be built around.

Bonding, Banking, and Credibility

Surety companies and banks look at how your business is structured and how clean your books are. A properly structured entity with separate accounts, a real payroll, and accurate financial statements signals that the company is run with discipline. Mixing personal and business money inside a default LLC raises questions that can slow down bonding and lending decisions. Entity structure is not just a tax question. It feeds directly into your ability to take on bigger, bonded work.

How Each Structure Is Taxed: A Side-by-Side Look

The clearest way to understand the difference is to follow the same profit through both structures. Assume a contractor whose business nets $200,000 after all expenses.

LLC Taxed as a Sole Proprietorship

The full $200,000 flows to the owner's personal return. All $200,000 is subject to self-employment tax at 15.3 percent, which comes to roughly $28,000 before the deduction for half of self-employment tax. The owner then pays ordinary income tax on the profit, reduced by the QBI deduction. There is no salary, no payroll filing, and no separate business tax return. It is simple, but the entire profit is exposed to self-employment tax.

LLC Taxed as an S Corp

The same $200,000 is split. The owner pays themselves a reasonable salary, say $90,000, which runs through payroll and is subject to the 15.3 percent in combined Social Security and Medicare tax. The remaining $110,000 comes through as a distribution that is not subject to self-employment or payroll tax. The payroll tax applies only to the $90,000 salary, not the full $200,000. That is where the savings come from. The business files a separate return, Form 1120-S, and the owner receives both a W-2 for the salary and a K-1 for the distribution.

In this example, the S corp election shields $110,000 of profit from the 15.3 percent tax. The gross saving is meaningful, though the net saving is smaller once you account for the added cost of running payroll and filing a corporate return.

Why You Cannot Just Pay Yourself a Tiny Salary

The obvious move looks like setting a $10,000 salary and taking $190,000 as a distribution to avoid almost all payroll tax. The IRS knows this game. S corp owners are required to pay themselves reasonable compensation for the work they actually do. A contractor who runs the company, manages projects, and sells the work cannot credibly claim that work is worth $10,000 a year. Pay yourself too little and you invite reclassification, back payroll taxes, penalties, and interest. Reasonable compensation is based on what you would pay someone else to do your job, and it needs to be documented and defensible.

When Should a Contractor Elect S Corp Status?

The S corp election is not automatically the right move. It adds cost and complexity, so it only pays off once the tax savings clear that hurdle.

1. Your profit is consistent and substantial. The savings come from the profit you take as distributions above a reasonable salary. If your net profit barely exceeds what a reasonable salary would be, there is little left to shield, and the election does not save much. Many contractors find the math starts working once net profit is consistently in the range where distributions above a reasonable salary are large enough to offset the added admin cost.
2. You can support a real payroll. An S corp requires running payroll, filing quarterly payroll returns, and issuing yourself a W-2. If your cash flow is too erratic to support a steady salary, the structure becomes a headache.
3. Your books are clean enough to file a corporate return. An S corp files Form 1120-S and must keep the balance sheet, distributions, and basis tracked correctly. If your bookkeeping is months behind, the election creates filing problems instead of savings. This is where solid construction bookkeeping becomes a prerequisite, not an afterthought.
4. You plan to stay in business. The election is a long-term decision. Setting up payroll and a corporate filing rhythm only makes sense if you intend to keep operating for years, not months.

A default LLC is often the right starting point for a newer or smaller contractor. As profit grows and stabilizes, the S corp election becomes the obvious next step. The transition should be timed deliberately, ideally at the start of a tax year, with the numbers run for your specific situation. It also pairs well with the other deductions you should be tracking, like those covered in our guide to construction tax deductions every contractor should know.

Common Entity Structure Mistakes Contractors Make

Getting the structure wrong, or getting it right and then mismanaging it, costs contractors real money. These are the errors that come up most often.

Forming an S Corp Too Early

A contractor netting $40,000 who elects S corp status often ends up worse off. The payroll service, the corporate tax return, and the bookkeeping requirements eat up most or all of the self-employment tax savings. The election should follow the profit, not lead it.

Paying an Unreasonably Low Salary

The temptation to minimize salary and maximize distributions is strong, but it is the single biggest audit trigger for S corps. An aggressive salary that does not match the work you do invites the IRS to reclassify distributions as wages, with penalties attached. Set a salary you can defend with comparable market data.

Treating Distributions Like a Paycheck

In an S corp, distributions are not the same as salary, and they are limited by your basis in the company. Pulling money out without regard to basis or without running a proper salary first creates tax problems. Distributions need to be recorded correctly, which depends on accurate books.

Mixing Personal and Business Money

This is fatal in any structure but especially damaging in an S corp. Running personal expenses through the business undermines the liability protection of the LLC, distorts your financial statements, and complicates the corporate return. Separate accounts and a clean general ledger are not optional once you make the election. The same discipline that keeps your construction accounting accurate protects the entity structure you just paid to set up.

Ignoring State-Level Taxes and Fees

Some states impose franchise taxes, gross receipts taxes, or annual fees that change the math on an S corp election. A structure that saves money federally can be partly offset at the state level. The decision has to account for the states where you operate and are registered.

How the Right Books Make the Decision Work

The tax savings from an S corp election are only real if the underlying accounting is accurate. The election creates new requirements: a payroll that runs on schedule, a clean separation between salary and distributions, a tracked basis, and a corporate return that ties to your financial statements. None of that works if the books are a mess.

This is where construction-specific accounting matters. A general bookkeeper who does not understand job costing, retainage, and progress billing will struggle to produce the clean financials an S corp return requires. Your controller services function should be producing accurate monthly statements that make the corporate filing straightforward, and your CFO advisor should be modeling the salary-versus-distribution split against your QBI deduction and cash flow needs. Many of the financial breakdowns that sink contractors trace back to weak books, a pattern we cover in our look at why construction companies fail.

How FinTruction Handles Entity Structure for Contractors

At FinTruction, we work with contractors to get the entity and tax structure right for where their business actually is, not where a generic template says it should be. We run the numbers on your specific profit, your reasonable compensation, and your QBI position before recommending whether the S corp election makes sense for you.

Once the structure is set, our construction bookkeeping keeps the salary, distributions, and basis tracked correctly, and our tax planning work makes sure the election keeps saving you money year after year instead of creating filing problems. We coordinate the payroll, the corporate return, and the financial statements so the whole thing holds together.

If you are operating as a default LLC and your profit has grown past the point where that still makes sense, you are likely paying more self-employment tax than you need to. If you elected S corp status without the books to support it, you are exposed to problems at filing time. Either way, the structure should be reviewed against your real numbers. You can see the full range of how we support contractors on our services overview.

Frequently Asked Questions About S Corp vs LLC for Contractors

Can an LLC be taxed as an S corp?

Yes. This is the most common setup for established contractors. You keep the LLC as your legal entity for liability protection and file Form 2553 with the IRS to elect S corp tax treatment. You get the legal simplicity of an LLC and the tax advantages of an S corp at the same time.

How much does an S corp save a contractor in taxes?

It depends on your profit and your reasonable salary. The savings come from the profit you take as distributions above your salary, which avoids the 15.3 percent self-employment tax. A contractor with $200,000 in net profit and a $90,000 salary shields the remaining $110,000 from that tax, though the net saving is reduced by the added cost of payroll and a corporate return. Run the numbers for your specific situation before deciding.

What is a reasonable salary for an S corp owner in construction?

Reasonable salary is based on what you would pay someone else to do the work you do, considering your role, the time you put in, and what comparable positions pay in your market. There is no fixed percentage rule. An owner who runs projects, manages crews, and sells work has a higher reasonable salary than a passive owner. Document how you arrived at the figure so you can defend it.

Do contractors qualify for the QBI deduction?

In most cases, yes. Construction is treated as a qualified trade or business rather than a specified service business, so contractors generally keep access to the 20 percent qualified business income deduction even at higher income levels. The deduction was made permanent in 2025. How you set your S corp salary affects the size of the deduction, so it should be planned alongside your compensation strategy.

Should a new contractor start as an LLC or an S corp?

Most newer contractors are better off starting as an LLC taxed the default way. It is simpler, cheaper, and avoids the payroll and corporate filing requirements of an S corp. As your profit grows and becomes consistent, the S corp election becomes worth the added work. The right time to switch is a numbers question, and it is best timed at the start of a tax year.

This article is general information, not individual tax or legal advice. Entity and tax decisions depend on your specific financial situation and the states where you operate. Talk to your tax advisor before making the election.