TL;DR. An LLC is a legal structure that protects personal assets. An S-Corp is a tax election that splits your business income into W-2 salary and shareholder distributions, cutting the 15.3% self-employment tax on the distribution portion. You form an LLC first, then file Form 2553 to elect S-Corp tax treatment. The election starts paying off around $40K-$60K in net profit and clearly pays for itself above $80K-$100K. Below that, the added compliance costs often outweigh the savings. Costs include payroll, a corporate return (1120-S), and reasonable salary documentation.
This is the question we hear more than almost any other. A business owner sits down for their first call with us and says, "My accountant told me I should be an S-Corp, but I'm an LLC right now. What's the difference? Should I switch?"
The short answer is: it depends on how much you're making, how you're paying yourself, and what your business looks like in three years. The long answer is what follows.
We're going to walk through what each structure actually is, where the tax savings come from, when the switch makes sense, and, just as importantly, when it doesn't. No jargon for jargon's sake. Just what you need to know before talking to us.
What an LLC actually is
An LLC, Limited Liability Company, is a legal structure. It separates your personal assets from your business. If someone sues your business, they can't come after your house (in most cases). That's the "limited liability" part.
But here's the thing that confuses people: an LLC is not a tax classification. The IRS doesn't have a tax category called "LLC." When you form an LLC, the IRS treats it as either a sole proprietorship (single member) or a partnership (multi-member) by default. You file your business income on your personal tax return, and that's that.
The key tax implication: all of your net business income is subject to self-employment tax. That's 15.3% on top of your regular income tax, covering Social Security (12.4%) and Medicare (2.9%). On $100,000 in profit, that's over $15,000 just in self-employment tax before you even get to income tax.
That number is what makes people start asking about S-Corps.
What an S-Corp actually is
An S-Corp is a tax election, not a legal structure. You don't "form" an S-Corp. You form an LLC (or a corporation), and then you file Form 2553 with the IRS to elect S-Corp tax treatment. Your LLC still exists. It's still an LLC. It's just taxed differently now.
The fundamental difference: as an S-Corp, you split your business income into two buckets.
Bucket 1: Salary. You pay yourself a "reasonable" W-2 salary. This is subject to payroll taxes (the employer and employee halves of Social Security and Medicare).
Bucket 2: Distributions. Whatever profit is left after your salary, you can take as shareholder distributions. These are not subject to self-employment or payroll tax. You still pay income tax on them, but you skip the 15.3%.
That's where the savings come from. Instead of paying self-employment tax on all $100,000, you pay payroll tax on, say, $50,000 in salary and take the other $50,000 as a distribution. You just saved roughly $7,650 in self-employment tax.
The "reasonable salary" rule
This is where it gets tricky, and where a lot of people get bad advice.
The IRS requires that S-Corp owners who work in the business pay themselves a "reasonable" salary. You can't pay yourself $10,000 a year and take $90,000 in distributions. That's a red flag, and the IRS has been increasingly aggressive about reclassifying distributions as wages when the salary is unreasonably low. For the full treatment, read our dedicated post on reasonable compensation.
What counts as "reasonable"? There's no magic formula. The IRS looks at factors like:
- What similar businesses pay for similar roles
- Your training and experience
- How much time you spend working in the business
- The company's revenue and profit history
- What you'd have to pay someone else to do your job
In practice, most CPAs recommend somewhere between 40-60% of net income as salary, depending on your situation. The exact number matters, and it's worth getting right. Too low and you risk an audit. Too high and you're not getting the tax benefit you elected S-Corp status for in the first place.
When the S-Corp election makes sense
The S-Corp election starts making financial sense when your business is consistently profitable enough that the payroll tax savings outweigh the additional costs. Those costs include:
- Payroll processing. You need to run actual payroll for yourself. That means payroll software or a payroll service, quarterly tax filings, W-2s at year-end.
- Additional tax filing. S-Corps file their own tax return (Form 1120-S) separate from your personal return. That's more accounting work and usually a higher tax prep fee.
- Reasonable salary analysis. You need to document that your salary is reasonable, which means we do the research and keep it on file.
- Bookkeeping complexity. S-Corps require more precise bookkeeping. You need to track shareholder basis, distributions vs. salary, and maintain clean separation between the two.
The general rule of thumb: if your business is netting less than $40,000-$50,000 per year, the additional costs of S-Corp compliance will eat most of the tax savings. The sweet spot where the election clearly pays for itself is usually somewhere north of $60,000-$80,000 in net profit, but it varies.
If you're netting $100,000+, the math almost always works in your favor. At $150,000+, you're leaving real money on the table by not electing S-Corp status.
When the S-Corp election doesn't make sense
Not every profitable business should be an S-Corp. Here are the situations where it might not be the right move:
You're in the early stages and income is inconsistent. If you had a great quarter followed by two slow ones, the S-Corp's payroll requirements become a headache. You still need to pay yourself a reasonable salary even in slow months, and catching up on payroll after the fact is messy.
You have significant losses. LLC losses flow directly to your personal return and can offset other income. S-Corp loss deductions are limited by your basis in the company, which can create complications if you're not tracking it carefully.
You plan to bring in investors or go public someday. S-Corps have restrictions: no more than 100 shareholders, only one class of stock, no foreign shareholders. If you're building a business you plan to scale with outside capital, the S-Corp structure will get in the way.
You're a single-member LLC with very low overhead. If your business is just you, a laptop, and a few subscriptions, the simplicity of a default LLC might be worth more than the tax savings of an S-Corp. Sometimes the right answer is the one that lets you focus on your business instead of your tax structure.
The mechanics of making the switch
If you decide the S-Corp election makes sense, here's what the process looks like:
- File Form 2553 with the IRS. This must be filed by March 15 of the tax year you want the election to take effect (or within 75 days of forming your LLC). Miss the deadline and you're waiting until next year, unless you qualify for late election relief.
- Set up payroll. Before you start paying yourself distributions, you need a payroll system in place. This means getting an EIN (if you don't already have one), registering with your state's tax authority, and choosing a payroll provider.
- Determine your reasonable salary. We run reasonable-compensation analysis as part of onboarding. Document the reasoning.
- Update your bookkeeping. Your chart of accounts needs to separate owner salary, payroll taxes, and shareholder distributions. Your bookkeeper should be tracking these as distinct line items. See QuickBooks Online tips for how to structure this.
- File the S-Corp return. At year-end, you'll file Form 1120-S for the business and receive a K-1 that flows to your personal return.
It's not complicated, but it does require planning. The worst version of this is the business owner who elects S-Corp status in January and doesn't set up payroll until October. Now you're scrambling to catch up on nine months of payroll, and your bookkeeper is doing extra work to reconcile everything.
What this means for your bookkeeping
This is the part most articles skip, and it's the part we care about most.
Your entity type directly affects how your books need to be kept. An S-Corp has more moving parts than a default LLC. Your bookkeeper needs to:
- Record payroll transactions correctly (salary, employer taxes, employee withholding)
- Track shareholder distributions separately from salary
- Maintain your shareholder basis schedule
- Ensure quarterly payroll tax filings are accurate
- Prepare year-end documents (W-2, 1120-S supporting schedules)
If your bookkeeper doesn't have experience with S-Corps, these things fall through the cracks. And when they do, you find out at tax time, which is the most expensive time to find out.
This is one of the reasons we emphasize entity-type experience when you're choosing a bookkeeper. The mechanics of S-Corp bookkeeping are different from sole proprietorship bookkeeping, and getting them wrong creates real problems.
The bottom line
The LLC vs. S-Corp decision isn't really a choice between two things. It's a question of whether your business has reached the point where the S-Corp tax election saves you more than it costs. For a lot of small businesses, the answer is yes, but the timing and execution matter.
Don't make this decision based on a blog post (including this one). Talk to us, or to your existing CPA. Look at your actual numbers. Factor in the additional costs. And make sure your bookkeeping is set up to handle whatever structure you choose.
Key takeaways.
- LLC is legal structure (liability protection). S-Corp is tax election (avoids self-employment tax on distributions).
- You form an LLC first, then elect S-Corp status via Form 2553 by March 15 of the target year.
- Break-even is typically around $40K-$60K net profit. Clear win above $80K-$100K.
- Costs include payroll processing, a corporate return (1120-S), and reasonable salary documentation.
- S-Corps cap at 100 shareholders, one stock class, no foreign shareholders. Not suitable if you plan to raise outside capital.
Common questions
Is an S-Corp a type of business or a tax election?
A tax election. You form a legal entity (an LLC or corporation) first, then file Form 2553 to elect S-Corp tax treatment. Your legal structure doesn't change, only the way the IRS taxes the entity's income.
At what net income does S-Corp election start saving money?
Typically around $40,000-$60,000 in net profit. Below that, the added compliance costs (payroll, corporate return, reasonable salary analysis) often outweigh the self-employment tax savings. The break-even varies by state and specific provider costs.
When must I file Form 2553 to elect S-Corp status?
By March 15 of the tax year you want the election to apply to, or within 75 days of forming the LLC. Late election relief is available in limited circumstances; our affiliated CPA firm, PizzelloCPA, PLLC, can advise if you missed the window.
Can I revoke my S-Corp election if it doesn't work out?
Yes, but you typically can't re-elect S-Corp status for five years after revocation without IRS consent. Make the initial decision carefully. Revocation is a significant step.
What's a "reasonable salary" for an S-Corp owner?
The fair-market wage someone else would earn doing your job at your S-Corp. Use BLS data, salary surveys, and industry benchmarks to set a defensible number. See our full post on reasonable compensation for methodology.
Do S-Corp owners need to run payroll even without employees?
Yes. As a shareholder-employee, your reasonable compensation must be paid through formal W-2 payroll with proper tax withholding, not as owner draws. Most owners use Gusto, ADP, or similar providers.
What additional tax returns does an S-Corp require?
Form 1120-S for the corporation itself, plus K-1s issued to each shareholder. You still file a personal 1040 with the K-1 income flowing through.
Can a single-member LLC elect S-Corp status?
Yes. A single-member LLC can elect S-Corp treatment via Form 2553 and operate just like any other S-Corp. Single-owner S-Corps are extremely common in professional services.
Are health insurance and retirement plans handled differently in an S-Corp?
Yes. Owner health insurance premiums must flow through payroll as additional W-2 wages, then are deductible on the personal return. Retirement contributions have specific owner/employee distinctions. We help you structure these correctly during onboarding, with CPA oversight from PizzelloCPA, PLLC.
Can I have investors in an S-Corp?
Limited. S-Corps cap at 100 shareholders, can only have one class of stock, and can't have foreign or corporate shareholders. If you plan to raise outside capital or go public, S-Corp structure will get in the way.
Does the S-Corp election protect me from lawsuits?
No. Liability protection comes from the underlying LLC or corporation, not the tax election. S-Corp status is purely tax treatment and doesn't affect liability.
What happens if I don't pay myself a "reasonable" salary?
The IRS can reclassify distributions as wages, assess back payroll taxes plus interest, and apply penalties (often 25%+ of taxes owed). See the David Watson case and our reasonable compensation post for the full risk profile.
Keep reading
- What Is Reasonable Compensation for S-Corp Owners?
- Tax Deductions Private Practice Owners Are Probably Missing
- When Should You Hire a Bookkeeper?
- How to Choose a Bookkeeper for Your Private Practice
- Entity and S-Corp planning for private practices
Figure out your numbers
If you're not sure where you stand, book a free consult. We'll look at your situation and help you figure out if the switch makes sense, and if it does, we'll make sure your books are ready for it.