When Should an LLC Elect S Corp Status? A CPA's Breakdown

An LLC usually starts to benefit from an S corp election once its profit is steady and comfortably above a reasonable salary for the work you do, so the self-employment tax you save on the rest is bigger than the added costs and the income tax you give back. There's no IRS profit threshold. The election lets you split profit into a salary, which carries payroll taxes, and distributions, which don't. But you take on payroll, a separate Form 1120-S return, and some trade-offs most quick calculators skip. The worked example below shows why the real savings are smaller than the headline number.

What does an S corp election actually change?

An S corp isn't a different kind of company. It's a tax election. Your LLC files Form 2553, and from then on it's taxed as an S corporation. (An eligible LLC that files a timely Form 2553 is treated as a corporation as of the election date and doesn't need a separate Form 8832.)

	Single-member LLC (default)	LLC taxed as an S corp
Federal return	Schedule C on your Form 1040	Form 1120-S, plus a K-1 to you
How you get paid	Draw from profit	W-2 salary through payroll, plus distributions
Payroll taxes	15.3% self-employment tax on most of your profit	15.3% Social Security and Medicare (split between the company and you) on your salary only
Distributions	n/a	Not subject to Social Security or Medicare tax
Extra filings	None	Payroll returns, W-2, Form 1120-S, state S corp return

The savings come from one place: profit you take as distributions instead of salary avoids the 15.3% (12.4% Social Security up to the wage base, which is $184,500 for 2026, plus 2.9% Medicare).

What counts as a reasonable salary?

The IRS requires an S corp to pay a shareholder who works in the business reasonable compensation before taking distributions. It can reclassify distributions as wages if the salary is too low. There's no formula. The IRS points to factors like:

• Your training and experience
• Your duties and responsibilities
• The time and effort you put into the business
• What comparable businesses pay for similar services
• What you pay non-owner employees
• The company's dividend and bonus history

The IRS also looks at where the money comes from. If most of the company's revenue comes from your personal services, as with consultants, designers and other solo service providers, more of the profit should generally be treated as wages. A "salary" set at a small fraction of profit just to save tax is exactly what the IRS looks for.

How much could I actually save? A worked example

This is an example with made-up numbers, not a real client. Federal only, 2026 rates, single filer, standard deduction ($16,100), no other income.

Riley runs a single-member LLC with $120,000 of profit before paying any owner salary. For this example, assume a $60,000 salary is reasonable for Riley's role.

Step 1: Payroll and self-employment tax

	Stay a sole-owner LLC	Elect S corp
Self-employment tax (15.3% × 92.35% × $120,000)	$16,955	—
Social Security and Medicare on $60,000 salary (both halves)	—	$9,180
Federal unemployment (FUTA, 0.6% of first $7,000, assuming full state credit)	—	$42
Total payroll / SE tax	$16,955	$9,222

That's $7,733 less in payroll-type taxes. This is the number most people quote. It isn't the whole story.

Step 2: Federal income tax

	Stay a sole-owner LLC	Elect S corp
Adjusted gross income	$111,522	$115,368
Qualified business income (QBI) deduction	$19,084	$11,074
Taxable income	$76,338	$88,194
Federal income tax	$11,506	$14,115

Income tax goes up by $2,609. Two reasons: you lose the deduction for half of self-employment tax, and your salary isn't qualified business income, so the 20% QBI deduction shrinks.

Step 3: Net result

	Stay a sole-owner LLC	Elect S corp
Total federal tax (Steps 1 + 2)	$28,461	$23,337
Federal tax saved by electing	—	$5,124

So the realistic federal savings in this example is about $5,100, not $7,700. That's before the added costs below, before state unemployment tax, and before the trade-offs. Change the salary or the profit and the answer moves a lot. That's why I run both scenarios with real numbers instead of using a rule of thumb.

What does an S corp cost to run?

The election adds real work and real costs every year:

• Payroll. You have to run payroll for yourself, withhold taxes, file quarterly federal payroll returns (Form 941) and the annual Form 940, and issue a W-2. Most owners use a payroll service.
• A separate business return. Form 1120-S is due the 15th day of the third month after year-end (March 15 for calendar-year companies, moved to the next business day when it falls on a weekend). Late filing has its own per-shareholder, per-month penalty.
• State filings and fees. In Arizona, that means an S corp return (Form 120S), Arizona withholding on your wages, and registering with the Department of Economic Security for state unemployment insurance. Other states can add franchise taxes or entity-level fees.
• Cleaner bookkeeping. The books have to support a balance sheet, payroll entries, and shareholder distributions, not just a profit number.

Compare these to the net savings from a calculation like the one above, not to the gross payroll-tax number.

Trade-offs that are easy to miss

• Smaller retirement contributions. The employer contribution to a Solo 401(k) or SEP is based on your W-2 salary, not your total profit. A lower salary means a lower limit. (See my SEP-IRA vs. Solo 401(k) comparison.)
• Lower Social Security earnings. Less salary means less earnings credited toward future Social Security benefits.
• Health insurance gets more complicated. For a more-than-2% shareholder, premiums generally have to be handled through the S corp and reported on your W-2 to take the self-employed health insurance deduction.
• It's harder to undo. If an S election is revoked or terminated, you generally need IRS consent to elect again before the fifth tax year after that.

When is the Form 2553 deadline?

To have the election apply to a tax year, Form 2553 generally has to be filed:

• No more than 2 months and 15 days after the start of that tax year, or
• Any time during the year before.

For a calendar-year LLC that wants S corp treatment for all of 2027, that means filing during 2026 or by March 15, 2027. For a brand-new business, the clock starts on the earliest of the date it first had owners, first had assets, or began doing business.

What if I missed the deadline?

Relief is often available. Under Rev. Proc. 2013-30, a business that meant to be an S corp can generally ask for late-election relief without a private letter ruling if:

• It files within 3 years and 75 days of the intended effective date.
• It had reasonable cause for filing late and acted diligently once it found the problem.
• All shareholders sign statements that they reported consistently with S corp status.

The form gets "FILED PURSUANT TO REV. PROC. 2013-30" written at the top, along with an explanation of the reasonable cause. The details matter, so this is a good place to have help.

Arizona considerations

• Arizona follows the federal S election. There's no separate state election form. The S corp files Arizona Form 120S by the 15th day of the third month after year-end, or the extended due date if it has a valid federal or Arizona extension.
• Flat individual rate. Arizona's individual income tax rate is 2.5% for 2026, so the state income tax effect of shifting between salary and distributions is small.
• Optional pass-through entity (PTE) tax. An Arizona S corp can elect to pay a 2.5% entity-level tax on its eligible shareholders' share of income. The election is made on Form 120S by the due date, including extensions. Whether it helps depends on your overall federal picture, so it's worth modeling rather than assuming.
• Payroll registration. Your salary means Arizona withholding (employees complete Form A-4) and state unemployment insurance, both of which you register for when you start payroll.

When should you NOT elect S corp status?

I'd hold off if any of these are true:

• Profit is low or unpredictable. If a reasonable salary would eat most of your profit, there's little left to save.
• You're in your first months. I'd rather see a few months of clean books and a realistic forecast first. (Here's what I'd do first after going out on your own.)
• You want to maximize retirement savings and a lower salary would shrink your contributions more than the election saves.
• You won't keep up with payroll and bookkeeping. Missed payroll deposits and late 1120-S filings create penalties that can wipe out the savings.
• You plan to sell or wind down soon, or your state adds costs that change the math.

Is there a profit level where an S corp always makes sense?

No. There's no IRS threshold. It depends on what a reasonable salary is for your work, your total profit, the QBI deduction, your state, retirement goals and added costs. A side-by-side calculation with your actual numbers is the only reliable answer.

Can I elect S corp status for this year if it's already October?

Usually not on time. For a calendar-year company, a timely election for 2026 had to be filed by March 16, 2026 (March 15 fell on a Sunday) or during 2025. Late-election relief under Rev. Proc. 2013-30 may still be available if you meet its requirements. Otherwise, you can file now for an election effective January 1, 2027.

Does an S corp reduce my income tax?

Not directly. S corp profit still flows through to your personal return. The main savings is on Social Security and Medicare taxes. As the example shows, income tax can actually go up slightly because the QBI deduction shrinks.

Before you decide

This is general information, not advice for your own tax situation. Whether an S corp election makes sense depends on your profit, a defensible salary for your role, your state and your goals. If you'd like me to run the numbers side by side for your business, reach out through my contact form. You can also see the services I offer.