S Corp vs LLC for Service Businesses: How to Choose

Key Takeaways

• An LLC with default tax status subjects all net profits to the 15.3% self-employment tax; an S corp election lets you split income between a taxable salary and distributions that are not subject to self-employment tax.
• As of 2026, the Social Security wage base is $184,500 — the 12.4% Social Security portion of payroll tax applies only up to that limit, per businessanywhere.io.
• The IRS requires an S corp to have no more than 100 shareholders, only one class of stock, and only U.S. citizen or resident shareholders.
• To elect S corp status, an LLC or corporation must file Form 2553 with the IRS; without that filing, default classification rules apply.
• The 20% Qualified Business Income (QBI) deduction applies to both structures, but with an S corp only distributions — not salary — qualify for the deduction, per businessanywhere.io.

For service businesses, the choice between an S corp and an LLC comes down to one core trade-off: an LLC is simpler and cheaper to run, but all profits are subject to the 15.3% self-employment tax; an S corp election can significantly reduce that tax burden by letting you split income between a salary and distributions, at the cost of added payroll and compliance requirements. Neither structure is universally better — the right answer depends on your net profit level, ownership situation, and appetite for administrative overhead.

The decision has real dollar consequences. A consulting firm or agency generating $200,000 in net profit pays materially different tax bills depending on which structure it uses. Understanding the mechanics — not just the labels — is what lets you make the call with confidence.

What Is an LLC, and How Is It Taxed?

An LLC is a business structure created under state statute, as the IRS explains. It provides limited liability protection — a legal separation between the business and its owners — so creditors can only pursue business assets, not the owner's personal property.

For federal tax purposes, the IRS treats an LLC based on its elections and number of members:

• Single-member LLC: Treated as a disregarded entity, reported on the owner's personal tax return (Schedule C).
• Multi-member LLC: Treated as a partnership by default, filing Form 1065 with each owner receiving a Schedule K-1.
• LLC electing corporate treatment: Files Form 8832 to be taxed as a C corp, or Form 2553 to be taxed as an S corp.

The critical tax consequence of the default LLC structure: members are considered self-employed and must pay self-employment taxes — 15.3%, which includes 12.4% for Social Security (up to the wage base) and 2.9% for Medicare with no wage base limit — on their entire share of the LLC's income, per the IRS and confirmed by Becker. This applies regardless of whether the income is actually distributed.

An additional 0.9% Medicare tax applies to self-employment income over certain threshold amounts, per Becker.

LLCs are also relatively inexpensive to maintain. Annual compliance costs typically run between $0 and $500, per businessanywhere.io.

What Is an S Corp, and How Is It Different?

An S corp is not a separate legal entity — it is a tax election. As one CPA puts it plainly: "An LLC is a way to set up your business with the state, and an S Corp is a way to file your taxes with the government," per Pool and Spa News.

To elect S corp status, a corporation or qualifying LLC files Form 2553, Election by a Small Business Corporation, signed by all shareholders. The IRS requires an S corp to meet all of the following criteria:

• No more than 100 shareholders
• Only one class of stock
• Shareholders must be U.S. citizens or residents
• Not be an ineligible corporation (certain financial institutions, insurance companies, and domestic international sales corporations are excluded)

Once elected, the S corp files Form 1120-S annually and passes income, losses, deductions, and credits through to shareholders via Schedule K-1.

The tax advantage is structural: owner-employees pay themselves a reasonable salary (subject to payroll taxes), and any remaining profits are distributed as dividends — which are not subject to self-employment tax. This split is the mechanism that generates the tax savings.

The IRS scrutinizes this arrangement closely. You cannot pay yourself an artificially low salary to maximize distributions. Your compensation must reflect what someone in your role would typically earn in the market, per Ed Lloyd & Associates. For a deeper look at how to set that number correctly, see our guide on S corp reasonable compensation for service businesses.

S corp compliance costs more than an LLC. Annual costs for payroll administration and tax preparation typically run $1,500–$4,800 per year, per businessanywhere.io.

How the Self-Employment Tax Savings Actually Work

The self-employment tax difference is the central reason service business owners consider the S corp election. Here is how the math works in practice.

As of 2026, the Social Security wage base is $184,500 — the 12.4% Social Security portion applies only up to that limit. The 1.45% Medicare tax has no wage base limit. An additional 0.9% Medicare tax applies to wages or self-employment income over certain thresholds, per Becker.

The table below uses a hypothetical example to illustrate the difference. All figures in this table are hypothetical illustrations, not measured benchmarks.

The Becker guide provides a concrete worked example using a technology consulting firm with $400,000 in net profit split between two equal owners ($200,000 each). Under the S corp structure with a $100,000 salary and $100,000 distribution per owner, each owner pays approximately $15,300 in payroll taxes. Under the LLC structure with $200,000 in pass-through income per owner, each pays approximately $27,636 in self-employment taxes — a difference of roughly $12,000 per owner per year, per Becker.

A separate illustration from Yahoo Finance shows a freelancer with $90,000 in taxable income paying $13,770 in self-employment taxes under an LLC, versus $11,475 under an S corp with a $75,000 salary — saving more than $2,000 in that scenario.

These are illustrative examples. Your actual savings depend on your net profit level, your reasonable compensation amount, your state tax situation, and your specific business expenses. Run your numbers with a qualified tax professional before making a structural change.

When Does the S Corp Election Make Sense?

The S corp election makes financial sense when the tax savings exceed the added compliance costs. Several practitioners converge on a similar threshold.

Many tax advisors recommend considering S corp status when net business income consistently falls between $40,000 and $60,000 or more, per businessanywhere.io. One CPA quoted in Pool and Spa News sets the bar at $70,000 in net income after expenses, noting that below that level, payroll and tax return costs can exceed the tax savings.

The logic is straightforward: S corp compliance costs run $1,500–$4,800 annually. At lower profit levels, those fixed costs can consume most or all of the self-employment tax savings, making the election a wash or worse. At higher profit levels, the savings pull clearly ahead.

Factors that favor the S corp election:

• Net profit consistently above $60,000–$70,000 after expenses
• You are a U.S. citizen or resident (foreign owners cannot hold S corp shares)
• You have 100 or fewer shareholders
• You are willing to run payroll and file Form 1120-S annually
• You can establish and document a defensible reasonable salary

Factors that favor staying with the LLC default:

• Net profit below the threshold where savings exceed compliance costs
• You want maximum simplicity and minimal administrative overhead
• You have foreign owners or more than 100 shareholders (S corp is not available)
• You are early-stage and profit levels are inconsistent

Many service businesses start as an LLC and convert to S corp taxation once profits stabilize above the threshold. The structure stays the same — LLC — but the tax election changes. Your legal liability protection is unaffected by the tax election.

What Is the QBI Deduction, and How Does It Apply?

The 20% Qualified Business Income (QBI) deduction — established under Section 199A — applies to both LLCs and S corps. The One Big Beautiful Bill Act of 2025 permanently established this deduction, per businessanywhere.io.

The deduction allows eligible owners to deduct up to 20% of their qualified business income. However, the interaction with the S corp structure creates an important nuance: with an S corp, only distributions — not the salary paid to shareholder-employees — qualify for the QBI deduction, per businessanywhere.io and Becker.

This means the salary-distribution split affects not just self-employment tax but also QBI eligibility. A higher salary reduces the amount of income eligible for the 20% deduction. This trade-off requires careful planning — optimizing for self-employment tax savings alone can inadvertently reduce your QBI deduction.

Limits apply based on income level and type of business. Specified service trades or businesses (SSTBs) — which include many professional service firms — face income-based phase-outs on the QBI deduction. Consult a qualified tax professional to determine how these limits apply to your specific situation.

S Corp vs LLC: Side-by-Side Comparison

Sources: IRS S corporations page, IRS Form 1120-S instructions, businessanywhere.io, Becker.

One compliance detail worth noting: for tax returns required to be filed in 2026, the minimum penalty for failure to file Form 1120-S more than 60 days late has increased to the smaller of the tax due or $525, per the 2025 Instructions for Form 1120-S. The per-shareholder late-filing penalty is $255 per month or part of a month, up to 12 months. These penalties make timely filing non-negotiable once you elect S corp status.

How to Make the Switch: Electing S Corp Status

If you decide the S corp election makes sense, the process is straightforward but timing-sensitive.

1. File Form 2553 with the IRS, signed by all shareholders. Per the IRS, an LLC that timely files Form 2553 is deemed to have also made an election to be classified as an association taxable as a corporation — you do not need to separately file Form 8832.
2. Establish payroll for yourself as an owner-employee. You will need an EIN (if you don't already have one), a payroll system, and a process for remitting payroll taxes.
3. Set a reasonable salary that reflects market compensation for your role. Document your rationale. The IRS scrutinizes S corps for artificially low salaries.
4. File Form 1120-S annually and issue Schedule K-1s to all shareholders.
5. Consult a tax professional before filing. State-level treatment of S corps varies, and some states do not recognize the S corp election or impose their own taxes on S corps.

The IRS Business Structures page (last reviewed October 2026) is the authoritative starting point for understanding your obligations under each structure.

Getting your books in order before making a structural change matters. Clean, current financials let you and your advisor model the actual tax impact before you commit. If your accounting is behind, that is the first problem to solve — see what a monthly close looks like before layering in entity-level tax planning.

Frequently Asked Questions

Is an S corp better than an LLC for service businesses?

Not always. An S corp election can reduce self-employment taxes significantly for profitable service businesses, but it adds payroll requirements and compliance costs of $1,500–$4,800 per year. Most advisors recommend evaluating the election when net profit consistently exceeds $60,000–$70,000 annually.

What is the self-employment tax rate for an LLC?

As of 2026, LLC members classified as self-employed pay 15.3% in self-employment tax — 12.4% for Social Security (up to the $184,500 wage base) and 2.9% for Medicare with no wage base limit — on their full share of net income, per businessanywhere.io and Becker.

Can an LLC elect to be taxed as an S corp?

Yes. An LLC can elect S corp taxation by filing Form 2553 with the IRS. The LLC's legal structure and liability protection remain unchanged — only the federal tax treatment changes. The LLC must meet all S corp eligibility requirements, including the 100-shareholder limit and U.S.-owner requirement.

Does the QBI deduction apply to both LLCs and S corps?

Yes, the 20% QBI deduction applies to both structures. However, with an S corp, only distributions qualify — not the salary paid to shareholder-employees. With an LLC taxed as a partnership or disregarded entity, the full pass-through income may qualify, subject to income limits and business-type restrictions, per Becker.

Disclaimer: Laya provides this content for informational purposes only. This material does not constitute tax, legal, or accounting advice. Tax rules referenced are current as of 2026; confirm thresholds and rates with an official source or qualified advisor before acting. Please consult your own tax, legal, and accounting advisors before engaging in any transaction.

If you want decision-ready financials that make entity-level tax planning easier, book an intro with Laya to see how we support service businesses through their monthly close and tax planning.