You started a side gig last year. Freelance web design. Made $78,000. Then tax season hit and you owed $11,200 in self-employment tax alone. That’s 15.3% on every dollar before you even paid income tax. Your neighbor with a similar income but an S-Corp election paid $3,900 less. How?
This article breaks down the real tax difference between an LLC and an S-Corp using actual IRS rules, not guesses. You’ll see the math on self-employment tax, the Qualified Business Income (QBI) deduction, and the exact income level where switching makes sense.
The Core Tax Difference: Self-Employment Tax vs. Payroll Tax
An LLC is a pass-through entity by default. All net income flows to your personal tax return. And every dollar of that income is subject to self-employment tax — 15.3% up to the Social Security wage base ($168,600 in 2026).
An S-Corp is also a pass-through entity, but with a critical difference. You must pay yourself a reasonable salary. That salary is subject to payroll tax (the employee and employer halves, totaling 15.3%). But any remaining profit — called a distribution — is not subject to self-employment tax.
| Structure | Tax on Salary/Wages | Tax on Remaining Profit |
|---|---|---|
| LLC (default) | 15.3% self-employment tax on ALL net income | 15.3% self-employment tax on ALL net income |
| S-Corp | 15.3% payroll tax on reasonable salary only | 0% self-employment tax on distributions |
This is the entire game. The S-Corp lets you split your income into two buckets. The salary bucket gets taxed like a W-2 job. The distribution bucket gets no self-employment tax. The LLC puts everything into one bucket and taxes it all at 15.3%.
But there’s a catch. The IRS requires that salary be reasonable. Pay yourself $20,000 on $150,000 of profit and you’re asking for an audit. The general rule: your salary should be what you’d pay someone else to do your job. For a web designer in 2026, that’s roughly $50,000–$80,000 depending on location and experience.
The QBI Deduction: How It Changes the Math
The Qualified Business Income (QBI) deduction under Section 199A lets you deduct up to 20% of your qualified business income. Both LLCs and S-Corps can claim it. But the calculation differs.
For an LLC, the QBI deduction is 20% of your net business income. For an S-Corp, it’s 20% of the net profit after subtracting your salary. That smaller base means a smaller deduction.
Here’s a concrete example. Assume $120,000 net profit, single filer, no other income, 2026 tax brackets.
| LLC | S-Corp (salary $60,000) | |
|---|---|---|
| Net profit | $120,000 | $120,000 |
| Salary | $0 | $60,000 |
| Distribution | $0 | $60,000 |
| Self-employment tax | $16,956 | $9,180 (on salary only) |
| QBI deduction (20%) | $24,000 | $12,000 (20% of $60,000 distribution) |
| Income tax (approx, 22% bracket) | $21,120 | $22,440 |
| Total tax | $38,076 | $31,620 |
The S-Corp saves $6,456 in this scenario. But the savings shrink if you’re in a lower tax bracket or if QBI deduction phases out (single filers above $220,600 in 2026 lose part of the deduction).
When an LLC Beats an S-Corp for Taxes
Most advice says “switch to S-Corp when you make $60,000+”. That’s oversimplified and often wrong.
Here are three situations where staying an LLC saves you more:
- Net profit under $40,000. The administrative costs of an S-Corp (payroll service, state filings, tax preparation) run $1,500–$3,000 per year. At $40,000 profit, the tax savings from the S-Corp are roughly $2,000. You break even or lose money.
- You qualify for the full QBI deduction. If your taxable income is under the phase-in threshold (single: $220,600, married joint: $441,200 in 2026), the LLC’s larger QBI deduction can offset the self-employment tax savings. Run the numbers both ways.
- You don’t need to reinvest in the business. S-Corp distributions must be proportional to ownership. You can’t take a distribution to buy equipment and leave your co-owner out. LLCs have more flexibility in how they allocate profits.
One more thing: state taxes. California charges an $800 annual franchise tax to S-Corps. New York imposes a fixed-dollar minimum tax. These eat into savings. Check your state’s treatment before filing Form 2553.
Five Mistakes That Kill S-Corp Tax Savings
An S-Corp election saves taxes only if you execute it correctly. These mistakes erase the benefit:
- Setting salary too low. The IRS uses a “reasonable compensation” standard. If an auditor decides your $30,000 salary is unreasonable for a business earning $200,000, they reclassify all distributions as wages. You owe back taxes plus penalties. Use salary data from the Bureau of Labor Statistics for your occupation and location.
- Ignoring payroll tax deadlines. S-Corps must file quarterly Form 941 and pay payroll taxes on time. Miss a deadline and the penalties stack up fast — 2% per month on late deposits, plus interest.
- Failing to document distributions. Every distribution must be authorized by the board (you, as sole director) and documented in meeting minutes. No paper trail means the IRS can argue the money was a disguised salary.
- Mixing personal and business funds. This pierces the corporate veil and can invalidate the S-Corp election. Open a separate business bank account and run all business transactions through it.
- Not filing Form 2553 on time. You have until March 15 of the tax year (or two months and 15 days after the start of the tax year for new entities) to elect S-Corp status. Late filers lose the benefit for that year.
If any of these sound like you, the LLC structure is safer. The S-Corp’s tax savings come with compliance costs that eat beginners alive.
When NOT to Form an S-Corp (Alternatives That Work Better)
The S-Corp is not the only tax-saving structure. Consider these alternatives before filing Form 2553:
- Sole proprietorship + solo 401(k). If your main goal is retirement savings, a solo 401(k) lets you contribute up to $23,000 as employee (2026 limit) plus 25% of net profit as employer. That’s a $53,000 deduction for a $120,000 profit — larger than the S-Corp’s self-employment tax savings for most people.
- LLC taxed as a C-Corp. If you plan to reinvest most profits into growth (buying equipment, hiring staff), a C-Corp’s 21% flat rate can beat the S-Corp’s pass-through rates. You’ll pay tax twice on distributions, but if you don’t distribute, the C-Corp wins.
- LLC with a qualified joint venture election. Married couples operating a business together can each report half the income on Schedule C, doubling the QBI deduction and avoiding the S-Corp’s salary requirement. No payroll taxes on the spouse’s share.
Each alternative has tradeoffs. The solo 401(k) doesn’t reduce self-employment tax. The C-Corp creates double taxation on dividends. The qualified joint venture only works for married couples. Match the structure to your actual financial goals, not the tax savings alone.
Your Decision Framework: LLC vs. S-Corp by the Numbers
Here’s a compressed verdict based on real data:
If your net profit is under $50,000, stay an LLC. The compliance costs of an S-Corp outweigh the tax savings. If your net profit is $50,000–$100,000, the S-Corp saves $3,000–$6,000 per year, but only if you handle payroll and filings correctly. If your net profit exceeds $100,000, the S-Corp almost always wins — savings of $8,000–$15,000 annually — provided you set a reasonable salary.
Back to that web designer with $78,000 in profit. Her neighbor’s S-Corp saved $3,900. But she also paid $2,200 in payroll service fees and accountant costs. Net savings: $1,700. Worth it? Maybe. But she could have earned the same $1,700 by raising her rates 3% and staying an LLC. The S-Corp isn’t magic. It’s a tool with a specific use case: high profit, low compliance tolerance, and a willingness to do paperwork.
Run your own numbers using IRS Form 1040-ES and a payroll calculator. If the S-Corp saves you at least $2,000 after costs, file Form 2553. If not, keep the LLC and focus on growing revenue.
Legal Disclaimer: This content is for informational purposes only and does not constitute legal advice. Laws vary by state and individual circumstances differ. Consult a licensed attorney in your jurisdiction before making legal decisions.