Sole Proprietorship vs S Corp: When the Switch Pays for a Freelancer

At FreelanceAtlas, we help freelancers decide when a change of business setup pays for itself. This guide lists every input, works the tax both ways at $100,000 of profit, shows how the break-even moves with salary and state, and ends with the steps and deadlines for switching. For the liability side of the decision, read Sole Proprietor vs LLC for Freelancers: Which Business Structure Do You Actually Need?, and for the reasonable salary rules in depth, read S Corp for Freelancers: When the Tax Savings Are Real.

This article is general information, not tax or legal advice. The break-even figures use 2026 federal amounts for a single filer and assumed running costs, and your salary, state, deductions and quotes will move them. Confirm your numbers with a CPA or enrolled agent, and the entity setup with an attorney in your state, before you form an entity or file an election.

Sole Proprietorship vs S Corp: What Changes When You Switch

A sole proprietorship is what you are by default. The US Small Business Administration’s guide to business structures says “You’re automatically considered to be a sole proprietorship if you do business activities but don’t register as any other kind of business.” Your profit goes on Schedule C, and IRS Topic 554 says “the amount subject to self-employment tax is 92.35% of your net earnings from self-employment,” at “12.4% for Social Security and 2.9% for Medicare taxes.” Schedule SE Tax Form: How to Fill Out the Self-Employment Tax Form covers that calculation line by line.

An S corp splits the same profit in two. You become an employee of your company and receive a salary through payroll, taxed at the 15.3 percent combined rate in IRS Topic 751. What remains after salary and expenses reaches you as K-1 income, which carries income tax but no Social Security or Medicare tax. That gap is the whole saving. Everything else in this guide is what it costs to get it.

You Need an LLC or a Corporation Before You Can Elect

A sole proprietor cannot file for S corp status alone. The SBA says “Sole proprietorships do not produce a separate business entity,” and the Instructions for Form 2553 say the election is made by “A corporation or other entity eligible to elect to be treated as a corporation.” In practice, a freelancer forms an LLC with the state first, then files Form 2553 for it. The instructions add that such an entity “doesn’t need to file Form 8832.”

Is Your LLC an S Corp or a Sole Proprietorship?

Forming an LLC does not change your tax on its own. The IRS page on single-member LLCs says an individual owner “is subject to the tax on net earnings from self employment in the same manner as a sole proprietorship.” Your LLC is an S corp for tax only if Form 2553 was filed and accepted, which the IRS confirms with a CP261 notice. If last year’s profit went on your own Schedule C, the IRS taxed the LLC like a sole proprietorship. If the business filed Form 1120-S, it was an S corp. The LLC route itself is covered in S Corp vs LLC: Which One a Freelancer Needs.

The Inputs Behind the Break-Even

Every figure below comes from these inputs. Change any of them and the break-even moves, so treat them as a template for your own numbers:

• Filer. Single, 2026 tax year, no other income, the $16,100 standard deduction and the 2026 single rate table in Revenue Procedure 2025-32. Taxable income stays under the $201,750 QBI threshold, so the simple 20 percent QBI rules apply.
• Profit. Revenue minus business expenses, before any salary to you.
• Salary. $60,000 a year, standing in for what a business would pay a non-owner to do your work at your hours.
• Payroll service. $600 a year, an assumption to replace with real quotes.
• Form 1120-S preparation. $1,500 a year on top of your personal return, also an assumption.
• Federal unemployment tax. $42 a year. IRS Topic 759 sets FUTA at 6.0 percent of the first $7,000 of wages, or 0.6 percent after the full credit for state unemployment tax.
• State unemployment tax. $300 a year, an assumption. Topic 759 notes that “Your state wage base may be different based on the applicable state’s rules.”
• State entity tax. None in the base case. California and Illinois versions follow later.
• Left out. Retirement contributions, health insurance, state income tax on your own return, and one-time costs of forming the LLC. Amounts are rounded to whole dollars at each step.

The four running costs add up to $2,442 a year. All of them are business expenses of the S corp, so they reduce its profit before tax.

Tax at $100,000 of Profit, Worked Both Ways

As a sole proprietor:

1. Self-employment tax. $100,000 x 92.35 percent = $92,350. Social Security is $92,350 x 12.4 percent = $11,451, and Medicare is $92,350 x 2.9 percent = $2,678, for $14,129.
2. Income before QBI. Half the self-employment tax, $7,065, is deductible, so adjusted gross income is $92,935. Minus $16,100, that is $76,835.
3. QBI deduction. Twenty percent of $92,935 is $18,587, capped at 20 percent of $76,835, which is $15,367.
4. Income tax. Taxable income is $61,468. The 2026 single table charges $5,800 plus 22 percent of the amount over $50,400: $5,800 + $2,435 = $8,235.
5. Total. $14,129 + $8,235 = $22,364.

As an S corp with a $60,000 salary:

1. Payroll tax. $60,000 x 15.3 percent = $9,180, of which the company pays $4,590 and $4,590 is withheld from your pay.
2. K-1 income. $100,000 – $60,000 salary – $4,590 employer tax – $2,442 running costs = $32,968.
3. Income before QBI. $60,000 + $32,968 = $92,968, minus $16,100 = $76,868.
4. QBI deduction. Salary does not count, so it is 20 percent of $32,968, or $6,594.
5. Income tax. Taxable income is $70,274, and the tax is $5,800 + 22 percent of $19,874 = $10,172.
6. Total. $9,180 + $10,172 + $2,442 of costs = $21,794.

The S corp comes out $570 ahead. Payroll tax is $4,949 lower than self-employment tax, income tax is $1,937 higher because of the smaller QBI deduction, and the running costs take $2,442. At $100,000 of profit with these inputs, the switch is close to even.

Where the Break-Even Lands Between $70,000 and $150,000

Repeating the same steps at other profit levels, with the salary held at $60,000 and costs at $2,442, gives this:

The two lines cross at about $95,600 of profit. The sole proprietor figures match the 2026 table in How Much to Set Aside for Taxes on 1099 Income in 2026 at the $100,000 and $150,000 rows.

Why the S Corp Loses Money Below the Break-Even

Running costs are only part of it. Even with zero running costs, the S corp in this example loses money below about $72,900 of profit. Take $64,590 of profit, exactly enough to cover the $60,000 salary and the company’s $4,590 of payroll tax, with no K-1 income left:

• Payroll tax vs self-employment tax. The S corp pays $9,180 on the full salary. A sole proprietor pays $9,126, because self-employment tax applies to only 92.35 percent of the $64,590.
• Income tax. The S corp owner pays $5,020 on $43,900 of taxable income. The sole proprietor deducts half the self-employment tax and gets an $8,785 QBI deduction, so the tax is $3,969.
• Result. $14,200 for the S corp against $13,095 for the sole proprietor, $1,105 more before a single dollar of running costs.

The salary portion is taxed slightly more heavily in an S corp. Savings start only on profit above the salary, and that profit has to be large enough to pay back the salary penalty and the running costs.

How Much Each Extra $10,000 Saves Above It

Between $100,000 and $140,000 of profit, each extra $10,000 widens the S corp’s advantage by about $1,290. That works out to roughly 12.9 cents per dollar: self-employment tax of about 14.13 cents per dollar (15.3 percent of 92.35 percent) disappears, while income tax rises by about 1.2 cents because K-1 income gets no deduction for half of a self-employment tax. Below the break-even, the same arithmetic tells you how far away it is. At $90,000 of profit, the S corp is $719 behind, which is roughly $5,600 of extra profit at that rate.

How the Salary You Choose Moves the Break-Even

The salary is the input with the largest effect, and you do not get to set it by preference. The IRS page on S corporation compensation says “S corporations must pay reasonable compensation to a shareholder-employee in return for services that the employee provides to the corporation before non-wage distributions may be made to the shareholder-employee.” It also says “to the extent gross receipts are generated by the shareholder’s personal services, then payments to the shareholder-employee should be classified as wages that are subject to employment taxes.” For a solo freelancer, almost all receipts come from personal services.

Here is the break-even profit at five salaries, with the same $2,442 of costs, in three state settings:

Each extra $10,000 of salary pushes the break-even up by roughly $12,600 to $19,000 of profit. The large gaps at a $50,000 salary are real: between about $77,000 and $85,000 of profit, the S corp owner’s taxable income has already reached the 22 percent bracket while the sole proprietor’s is still in the 12 percent bracket, so each extra dollar saves only about 5 to 6 cents and a fixed state charge takes a long stretch of profit to cover.

Use a salary you could defend with market data for your role, hours and experience, and write down the sources. A salary set to make the S corp look good is the number the IRS can reclassify.

State Fees That Raise the Break-Even

Some states tax the S corp itself, and a sole proprietor pays none of it:

• California. The Franchise Tax Board taxes S corporations at 1.5 percent of net income and says they “are subject to the annual $800 minimum franchise tax.” It waives the minimum for a newly formed or qualified S corporation’s first taxable year, but “Any first-year net income is still subject to the 1.5% tax rate.” The table uses the full rule that applies from year two, figured as 1.5 percent of the K-1 income before the state tax.
• Illinois. The Department of Revenue’s income tax rates page lists a personal property replacement tax of 1.5 percent of net income for “Partnerships, trusts, and S corporations.” A sole proprietor does not pay it.
• States that ignore the election. The SBA notes that some states “don’t recognize the S corp election at all, simply treating the business as a C corp.” Read your state revenue department’s S corporation page before you rely on any federal saving.

The LLC that you need for the election has its own state fees too: a formation fee and, in many states, an annual report fee or tax. Best State to Form an LLC for Freelancers: Why Home Usually Wins lists them for seven states from official fee pages. If you would form the LLC anyway for liability reasons, those fees are not a cost of the S corp. If you would not, add them, though in California ask a preparer whether the $800 LLC annual tax still applies once the LLC is taxed as an S corp. In this example, each extra $100 a year of fixed cost raises the break-even by about $640 of profit.

Payroll Costs and Filings You Take On

The $600 and $1,500 in the inputs pay for real work. As an S corp, the business takes on:

• Payroll deposits. Withheld income tax and both halves of Social Security and Medicare tax are deposited on a monthly or semi-weekly schedule, which the IRS employment tax due dates page says you must determine “Before the beginning of each calendar year.”
• Quarterly and annual returns. Form 941, due April 30, July 31, October 31 and January 31, plus Form 940 for federal unemployment tax.
• A W-2 for you. Forms W-2 “are required to be provided to employees by Jan. 31,” with Form W-3 filed with the Social Security Administration.
• Form 1120-S. Due by the 15th day of the third month after the tax year ends, March 15, 2027 for calendar 2026. The Instructions for Form 1120-S charge a late filing penalty on a return with no tax due “for each month or part of a month (up to 12 months),” multiplied by the number of shareholders, and Revenue Procedure 2025-32 sets it at $260 a month for returns due in 2027.
• State payroll accounts. State income tax withholding, where your state has an income tax, and state unemployment insurance.

A payroll service usually handles deposits, quarterly returns and the W-2. Ask what its price includes, because a quote that leaves out state filings will understate your cost.

What You Give Up When You Leave Self-Employment Tax

Three trade-offs do not show up in the break-even table:

• QBI on your salary. The Instructions for Form 8995 exclude “Amounts received as reasonable compensation from an S corporation” from qualified business income. That is already in the numbers above, and it is why income tax rose by $1,937 at $100,000 of profit.
• Retirement room. The IRS S corporation retirement FAQ says “You can’t make contributions to a self-employed retirement plan from your S corporation distributions.” Contributions are based on the $60,000 salary, not on $100,000 of profit. Retirement Accounts for Freelancers: SEP IRA vs Solo 401(k) in 2026 compares the plans.
• Social Security earnings. Topic 554 says “The Social Security Administration uses the information from Schedule SE to compute your benefits under the Social Security program.” As a sole proprietor at $100,000 of profit, $92,350 of earnings is taxed for Social Security. As an S corp owner, only the $60,000 salary is.

Disadvantages of Staying a Sole Proprietor

Staying put has costs too, and only some of them are tax:

• Personal liability. The SBA says “your business assets and liabilities are not separate from your personal assets and liabilities. You can be held personally liable for the debts and obligations of the business.” An LLC addresses this without any S corp election.
• Self-employment tax on every dollar of profit. At $150,000 of profit in the table, that gap is worth $6,921 a year.
• Harder to raise money. The SBA adds that “It can also be hard to raise money because you can’t sell stock, and banks are hesitant to lend to sole proprietorships.”
• No payroll. You cannot pay yourself a W-2 salary as a sole proprietor, so tax on profit is covered by estimated payments, which How to Pay Yourself as a Freelancer or LLC Owner: Draws vs Salary explains.

The SBA also says sole proprietorships “can be a good choice for low-risk businesses and owners who want to test their business idea before forming a more formal business.” Below the break-even, that is where the numbers point too.

How to Switch From Sole Proprietor to S Corp, Step by Step

1. Run your own break-even. Use the steps above with your profit, a salary you can support, and quotes for payroll and the return. Our income goal planner is a place to set the profit you expect, and our self-employment tax calculator gives the sole proprietor side.
2. Form an LLC in your home state. File with the secretary of state and pay the state fee.
3. Get an EIN for the LLC. The IRS single-member LLC page says “An LLC will need an EIN if it has any employees,” and as an S corp owner, you are its employee. EIN for Sole Proprietors: When Freelancers Need One and How to Apply walks through the application. If you lose the confirmation, IRS Letter 147C: How to Get Your EIN Confirmation Letter explains how to get it again.
4. Open a business bank account in the LLC’s name, and move all client payments there.
5. File Form 2553 on time. The instructions allow filing “No more than 2 months and 15 days after the beginning of the tax year the election is to take effect.” A new entity’s first tax year starts on the earliest of when it “first had shareholders (owners),” “first had assets” or “began doing business.” For an existing LLC that wants S status from January 1, 2027, the deadline is March 15, 2027.
6. Wait for the CP261 notice. The IRS says a business “should generally receive a determination on its election within 60 days,” and to call 1-800-829-4933 if you hear nothing within 2 months.
7. Start payroll with federal and state accounts set up, and pay the first salary before you take any distributions.
8. Update clients and tax payments. Send clients a new Form W-9 with the LLC’s name and EIN, as W-9 for Freelancers: How to Fill It Out and When a Client Can Ask describes, and lower your estimated payments to account for the tax now withheld from your salary.

If the LLC starts partway through a year, that year is split: profit before the start date still goes on your Schedule C, and profit after it goes through the S corp. For the C corp alternative, which rarely fits a solo freelancer, see S Corp vs C Corp for a One-Person Business.

Conclusion

A sole proprietor pays self-employment tax on 92.35 percent of all profit, and an S corp owner pays payroll tax only on a salary. The S corp also taxes that salary slightly more, removes it from the QBI deduction and adds running costs, so it saves money only once profit clears a break-even. With a $60,000 salary and $2,442 of yearly costs in 2026, that break-even was about $95,600 with no state entity tax, $98,600 in Illinois and $100,700 in California.

Above the break-even, each extra $10,000 of profit saved about $1,290, and the advantage reached $6,921 at $150,000. Run the calculation with a salary you can defend and real quotes. If it clears your break-even by a margin you care about, form the LLC, file Form 2553 by March 15, 2027 for a January 1, 2027 start, and set up payroll before the first distribution.

Key Takeaways

• A sole proprietor cannot elect S corp status alone: Form 2553 is filed by a corporation or an entity such as an LLC, which does not need Form 8832 first.
• With a $60,000 salary and $2,442 of yearly costs, the 2026 break-even was about $95,600 of profit with no state entity tax, $98,600 in Illinois and $100,700 in California.
• At $100,000 of profit, the S corp paid $4,949 less in payroll tax but $1,937 more in income tax, leaving $570 after costs.
• Even with no running costs, the S corp lost $1,105 at $64,590 of profit, because payroll tax applies to the full salary and salary gets no QBI deduction.
• Above the break-even, each extra $10,000 of profit saved about $1,290, and each extra $100 of yearly fixed cost raised the break-even by about $640.
• California taxes S corp income at 1.5 percent with an $800 minimum, and Illinois charges a 1.5 percent replacement tax that a sole proprietor does not pay.

Frequently Asked Questions

Is it better to be a sole proprietorship or an S corp?

It depends on how far your profit sits above a reasonable salary. In our 2026 example for a single filer with a $60,000 salary and $2,442 of yearly costs, the S corp only paid off above about $95,600 of profit, and it saved $6,921 at $150,000. Below the break-even, a sole proprietorship, or a single-member LLC taxed the same way, costs less and needs no payroll.

How much tax does an S corp that earns $200,000 pay?

The S corp itself generally pays no federal income tax, because the profit is taxed on the owner’s return, although states such as California and Illinois charge 1.5 percent. For a single filer in 2026 with $200,000 of profit, a $100,000 salary and $2,442 of costs deducted by the business, our estimate is $15,300 of payroll tax and $29,996 of income tax, or $47,738 with the costs. As a sole proprietor, the same profit would carry $53,430 of federal tax.

What are the disadvantages of a sole proprietorship?

The SBA says a sole proprietor can be held personally liable for the business’s debts and obligations, and that raising money is hard because you cannot sell stock. You also pay self-employment tax on 92.35 percent of all profit, which in our 2026 example cost $6,921 more than an S corp at $150,000 of profit. An LLC fixes the liability issue without changing your tax.

Is my LLC an S corp or a sole proprietorship?

A single-member LLC is taxed like a sole proprietorship unless it filed Form 2553 and the IRS accepted it. Acceptance comes as a CP261 notice. If your profit went on your own Schedule C last year, the LLC was taxed as a sole proprietorship, and if the business filed Form 1120-S, it was an S corp.

When should a sole proprietor file Form 2553?

After forming an LLC or corporation, because a sole proprietorship cannot elect on its own. The form is due within 2 months and 15 days after the tax year the election covers begins, or any time in the year before, so an existing LLC that wants S status from January 1, 2027 must file by March 15, 2027. The IRS generally decides within 60 days.