How Does Entity Selection Affect My Business Taxes?
Last reviewed: July 2026
Entity selection tax outcomes hinge on one question: how much of your profit gets hit with self-employment tax, and how much escapes it. A sole proprietor or single-member LLC pays the full 15.3% self-employment tax on every dollar of net profit. An S corporation owner pays that tax only on a reasonable salary, not on distributions. That single difference can swing your tax bill by thousands of dollars a year once your business turns a real profit.
Key Takeaways
- Sole proprietors and single-member LLCs pay 15.3% self-employment tax on all net profit, per the IRS.
- S corp owners pay payroll tax only on a reasonable salary, sheltering distributions from the 15.3% hit.
- In 2026, the Social Security portion of payroll tax applies up to a wage base of $184,500, per the SSA.
- C corporations pay a flat 21% corporate tax, then owners pay again on dividends, per the IRS.
About the Author: Jeff Judge, CFP®, AEP®, ChFC®, CLU® is Managing Partner of Chesapeake Financial Planners in Forest Hill, Maryland. He has been helping business owners in Harford County and the Baltimore metro area navigate entity selection and owner compensation since earning his CFP® certification in 2013, by using Chesapeake Financial Planners’ signature process, the R.U.D.D.E.R. method™. Jeff sees the same pattern every year: owners pick a structure when revenue is zero, then never revisit it once profit climbs into the range where an S corp election would pay for itself many times over.
What Are the Main Business Entity Types and How Are They Taxed?
There are five structures most business owners actually choose between, and the tax treatment for each is what separates them more than the legal paperwork does. The legal entity (LLC, corporation) and the tax election (how the IRS taxes it) are two different decisions, which is where most of the confusion starts.
| Entity Type | How Profit Is Taxed | Self-Employment / Payroll Tax | Best Fit |
|---|---|---|---|
| Sole proprietorship | Flows to personal return | 15.3% on all net profit | Solo side businesses |
| Single-member LLC | Flows to personal return (disregarded) | 15.3% on all net profit | Solo operators wanting liability protection |
| Partnership / multi-member LLC | Pass-through to partners | 15.3% on each active partner's share | Multiple active owners |
| S corporation (election) | Pass-through | Payroll tax on salary only | Profitable owner-operators |
| C corporation | 21% corporate tax, then dividend tax | Payroll tax on wages | Capital-raising, retained earnings |
Jeff Judge often tells clients that the letters after the business name matter less than the tax election behind them. An LLC by itself saves you nothing on taxes. It protects your personal assets, but on its own it is taxed exactly like a sole proprietorship or partnership. The tax savings only show up when you make an election, most commonly the S corp election.
How Does Self-Employment Tax Drive the Whole Decision?
Self-employment tax is the 15.3% combined Social Security and Medicare tax (12.4% Social Security plus 2.9% Medicare) that sole proprietors, partners, and single-member LLC owners pay on net earnings. According to the IRS, the Social Security portion applies only up to the annual wage base, which the Social Security Administration set at $184,500 for 2026. The Medicare portion has no cap, and high earners pay an extra 0.9% Medicare surtax above certain income thresholds.
Here is why this single tax controls the entity decision. Take a business netting $100,000. A sole proprietor pays roughly $15,300 in self-employment tax on that full amount. An S corp owner who pays a $60,000 reasonable salary pays payroll tax only on the salary, shielding the remaining $40,000 of distributions from the 15.3% hit. That gap is the money on the table.
The catch is that distributions only escape the tax if your salary is genuinely reasonable. The IRS does not let you pay yourself $10,000 and call $90,000 a distribution. Lowball the salary and you invite back taxes and penalties.
When Does an S Corporation Election Actually Pay Off?
An S corp election starts to pay off once net profit is high enough that the payroll tax savings on distributions exceed the added cost of running payroll, filing a separate return, and maintaining corporate formalities. As a rule of thumb in our practice, the math turns favorable somewhere around $60,000 to $80,000 of net profit for an owner who actively works in the business.
Consider an owner netting $150,000 who elects S corp treatment and pays a $90,000 reasonable salary:
- Reasonable salary: $90,000 (payroll tax roughly $13,770)
- Distribution: $60,000 (no self-employment tax)
- Approximate annual savings versus sole proprietorship: around $9,180
The election requires filing Form 2553 with the IRS, and S corps are limited to 100 shareholders who must be U.S. citizens or residents, with only one class of stock allowed. Those limits rarely matter for a closely held small business but can block you later if you bring in venture investors.
This is exactly the kind of trade-off the R.U.D.D.E.R. Method™ is built for. The R.U.D.D.E.R. Method™ is Chesapeake Financial Planners' six-step planning process: Review and Recognize, Uncover and Understand, Design and Develop, Discuss and Decide, Execute and Empower, and Reassess and Refine. Entity selection is not a set-it-and-forget-it choice. The "Reassess and Refine" step is where most savings get captured, because the right answer changes as profit grows.
When Is a C Corporation the Right Choice?
A C corporation makes sense when you plan to retain earnings inside the business for growth, raise outside capital from investors, or offer equity compensation across multiple share classes. The C corp pays a flat 21% corporate tax, per the IRS, and then owners pay personal tax on any dividends they take out, which is the "double taxation" everyone warns about.
For most small business owners who want to pull profit out each year for personal use, double taxation makes the C corp the most expensive option. Where it shines is the high-growth startup planning to reinvest every dollar, court venture capital, or eventually go public. Investors strongly prefer C corps because the structure handles preferred stock, option pools, and multiple owners cleanly.
Don't forget the qualified business income deduction either. Pass-through owners (sole props, partnerships, S corps) may qualify for a deduction of up to 20% of qualified business income under Section 199A, per the IRS. That deduction is not available to C corp owners on their distributions, which tilts the math back toward pass-through structures for many service businesses.
Frequently Asked Questions
What is the difference between an LLC and an S corp for taxes?
An LLC is a legal structure, while an S corp is a tax election. A single-member LLC is taxed like a sole proprietorship, meaning the owner pays 15.3% self-employment tax on all net profit. When that same LLC elects S corp treatment, the owner pays payroll tax only on a reasonable salary, sheltering distributions from self-employment tax.
How much profit do I need before an S corp election makes sense?
An S corp election typically becomes worthwhile once net profit reaches roughly $60,000 to $80,000 for an owner who actively works in the business. Below that range, the added cost of payroll processing, a separate tax return, and corporate formalities can outweigh the self-employment tax savings on distributions. Run the numbers with an advisor before electing.
Does forming an LLC reduce my taxes?
No, forming an LLC by itself does not reduce your taxes. A single-member LLC is taxed exactly like a sole proprietorship, and a multi-member LLC is taxed like a partnership, meaning active owners still pay 15.3% self-employment tax on their share of profits. Tax savings come only from electing S corp treatment, not from the LLC structure alone.
What is self-employment tax and who pays it?
Self-employment tax is a 15.3% combined Social Security and Medicare tax that sole proprietors, partners, and single-member LLC owners pay on net earnings. It breaks down to 12.4% for Social Security, capped at the 2026 wage base of $184,500, plus 2.9% for Medicare with no cap. High earners pay an additional 0.9% Medicare surtax above set income thresholds.
Why do investors prefer C corporations?
Investors prefer C corporations because the structure cleanly supports preferred stock, employee option pools, and multiple classes of shares, which venture capital deals require. C corps also have no limit on the number or type of shareholders, unlike S corps, which cap ownership at 100 U.S.-resident shareholders with one class of stock. For high-growth startups seeking outside capital, the C corp is usually the default.
Can I change my business entity later?
Yes, you can change your entity election as your business grows, and many owners should. A common path is starting as a sole proprietorship or single-member LLC, then electing S corp treatment once profit climbs into the range where the self-employment tax savings outweigh the added compliance cost. Revisiting your structure every few years is part of sound tax planning.
For owners weighing the eventual sale of the business, entity structure also shapes your exit. What's the most tax-efficient way to exit my business? covers how your structure affects the tax on a sale. As income climbs, How can I potentially optimize my taxes as my income grows? and How Can I Reduce Taxes When Earning $200K to $500K? dig into the bracket-level moves that pair well with the right entity. For the broader picture, see What is a year-round tax planning calendar for retirees and pre-retirees?.
The right entity is not a one-time decision. It is a moving target that should be reviewed as your profit grows and your goals shift. If you want a plain-English walkthrough of which structure fits your situation, our business owner tax planning guide breaks down the trade-offs in detail. Download it at chesapeakefp.com.
Want to go deeper? Our Tax Strategy Readiness Quiz walks through this step by step.
Disclosures
The information provided is for educational purposes only and should not be construed as investment advice. Investment strategies should be tailored to individual circumstances, risk tolerance, and goals. Past performance doesn't guarantee future results. Consult with qualified financial professionals regarding your specific situation.
This information is not intended to be a substitute for specific individualized tax, investment or legal advice. We suggest that you discuss your specific situation with a qualified tax, legal or financial advisor.
Advisors associated with Chesapeake Financial Planners may be either (1) LPL Financial Registered Representatives offering securities through LPL Financial, Member FINRA and SIPC, and investment advisor representatives offering investment advice through Great Valley Advisor Group; or (2) solely investment advisor representatives offering investment advice through Great Valley Advisor Group and not affiliated with LPL Financial. Great Valley Advisor Group, and Chesapeake Financial Planners are separate entities from LPL Financial.
