Should Your Business Be an S Corp in 2027?

October 12, 2026 · By Winnie Jayne

Once a business starts doing well, someone usually tells the owner to become an S corp. It might be a friend, a podcast, or another business owner. The advice can be right, but the savings are often smaller than promised, and for some businesses an S corp costs more than it saves.

The S corp question is worth answering with your own numbers. This guide covers where the savings come from, what it costs to run, the tradeoffs most people don’t hear about, and how to decide in time for January 1, 2027.

This guide is for U.S. business owners who are self-employed or own an LLC that isn’t taxed as a corporation.

The dates that matter

Date	What’s due
Before your first 2027 paycheck	Payroll set up, with your salary decided
March 15, 2027	Form 2553, if you want S corp status starting January 1, 2027
March 15, 2028	Your first S corp tax return (Form 1120-S), for 2027, before any extension

The election deadline is in March, but the decision is easier to make in the fall. You need time to run the numbers, set up payroll, and tell your bookkeeper before the year starts.

1. An S corp is a tax election, not a kind of business

You don’t form an S corp. You form an LLC or a corporation under your state’s rules, and then the business elects to be taxed as an S corp by filing Form 2553 with the IRS. An LLC that files Form 2553 doesn’t need a separate form to be treated as a corporation first.

Forming an LLC doesn’t change your federal taxes on its own. A single-member LLC is taxed like a sole proprietorship unless it elects otherwise, so you still pay self-employment tax on most of your profit. The LLC is your legal structure under state law. The election is what changes the tax.

An S corp generally doesn’t pay federal income tax itself. Its profit passes through to the owners, who report it on their personal returns and pay tax at their own rates. Choosing an S corp changes how you pay tax on your profit, not whether you pay it.

Not every business can elect. An S corp can have no more than 100 shareholders, only certain kinds of owners (no partnerships, corporations, or nonresident aliens), and one class of stock.

2. Where the savings come from

As a sole proprietor or single-member LLC, you pay self-employment tax on most of your profit. That’s Social Security and Medicare together, 15.3%, with the Social Security part stopping at $184,500 of earnings for 2026.

As an S corp owner who works in the business, you’re also its employee. Social Security and Medicare apply to your salary, at the same combined rate, split between you and the business. The rest of the profit can come to you as distributions, which those taxes don’t apply to. That difference is the payroll tax savings, before income tax and the added costs.

Income tax is a separate matter. You pay it on your salary and on the business profit, whether you take the money out or leave it in the business.

A worked example

Sam is a marketing consultant whose business makes $150,000 in profit before paying himself. He’s single, has no other income, and takes the standard deduction. The table shows his 2026 federal tax both ways, assuming an S corp salary of $70,000 and $2,500 a year to run the S corp.

	Sole proprietor	S corp
Social Security and Medicare tax	$21,200	$10,700
Federal income tax	$16,400	$19,400
Cost to run the S corp	$0	$2,500
Total	$37,600	$32,600

The S corp saves Sam about $10,500 in Social Security and Medicare tax. But his income tax goes up about $3,000, mostly because one deduction many owners get, 20% of qualified business income, is figured only on the profit left after his salary. Add the cost of running the S corp, and he comes out about $5,000 ahead, not $10,500.

That’s still real money, and it may well be worth it for Sam. It’s also half of what the quick math promised, and it moves with every assumption: his salary, his costs, his state, and whether he saves for retirement through the business. Your numbers will be different.

This example uses 2026 federal rates, rounded. State taxes, retirement contributions, and health insurance aren’t included. Sam’s $70,000 salary is for illustration, not a recommendation for what a consultant should be paid. The $2,500 is what the S corp adds in yearly costs compared with running as a sole proprietor.

To run the same comparison with your own numbers, try the S corp calculator.

3. The catch: a reasonable salary

If you work in your S corp, it has to pay you a reasonable salary before you take other money out as distributions. When the salary is too low, the IRS can treat distributions as wages, and the payroll taxes you skipped come due.

Reasonable means roughly what the business would pay someone else to do the work you do. The IRS looks at things like your training and experience, your duties, the time you put in, and what comparable businesses pay for similar work. When most of the profit comes from your own work, more of it needs to be salary. When it comes from employees or equipment, less of it does.

A few things follow from that:

You can’t pick a tiny salary and call everything else profit. A $20,000 salary on $150,000 of profit you earned yourself is the kind of setup that draws attention.
Your salary is paid through payroll, with taxes withheld, ideally on a regular schedule through the year.
Write down how you set it: the job, what similar roles pay, and your hours. That record is what supports the number if anyone asks.

The salary drives every other number. In Sam’s example, raising his salary to $75,000 cuts his savings by about $900, and lowering it to $65,000 adds about $900. That’s why the salary decision comes first.

4. What it costs to run

An S corp adds work every year, and most of it costs money:

Payroll. A payroll service to pay your salary, withhold taxes, and file the quarterly and annual payroll returns and your W-2.
Unemployment taxes. Federal unemployment tax on your salary, plus state unemployment tax in many states.
A separate business return. The S corp files its own return, due March 15. Your personal return then picks up your share of the profit from the Schedule K-1 that return produces.
State fees and taxes. Annual reports, franchise taxes, and in some places a tax on the S corp itself. Section 6 covers where this changes the answer.
Tighter bookkeeping. Your salary, distributions, and reimbursements each have to be recorded correctly, and business and personal money have to stay separate.

Sam’s $2,500 is only an example. Get real quotes for payroll and tax prep before you decide.

5. Tradeoffs people don’t hear about

The payroll tax savings get the attention. These are the parts that tend to surface after the election, when they’re harder to change.

Your qualified business income deduction can shrink. Many owners can deduct up to 20% of their qualified business income. Your S corp salary doesn’t count as qualified business income, so a higher salary means a smaller deduction. That’s most of why Sam’s income tax went up.

Retirement contributions are tied to your salary. In a Solo 401(k), the business’s contribution for you is based on your W-2 salary, up to 25% of it. On a $70,000 salary, that part tops out at $17,500. As a sole proprietor with the same profit, Sam could contribute about $27,900. Your own salary deferrals into the plan are separate from these amounts. If saving through the business matters to you, set the salary and the plan together.

A lower salary means a lower Social Security record. Your future Social Security benefit is based on the earnings you paid Social Security tax on. Paying less of that tax now can mean a smaller benefit later, depending on the rest of your earnings history. For some owners that’s a fair trade, but it should be one you make on purpose.

Health insurance has to run through the business. If you own more than 2% of the S corp, your premiums need to be paid or reimbursed by the S corp and added to your W-2 for you to keep deducting them on your personal return. You can buy the policy in your own name, as long as the S corp pays or reimburses the premiums. If you pay them yourself and the S corp never reimburses you, you lose that deduction.

Business costs you pay personally get reimbursed, not deducted. As a sole proprietor, you deduct your home office, phone, and business mileage on your own return. As an employee of your S corp, you generally can’t. Instead, the S corp reimburses you under a written accountable plan and deducts the reimbursement itself.

Getting out is harder than getting in. Once an S corp election ends, you generally can’t elect again for five years without IRS permission. Taking property out of an S corp, or closing it, can also create tax that a sole proprietor wouldn’t face.

6. When it usually isn’t worth it yet

There’s no profit number where an S corp automatically makes sense. These are the situations where it usually doesn’t, at least not yet:

Your profit barely covers a reasonable salary. If most of your profit would have to be salary anyway, little is left to come out as distributions, and the costs can eat the rest.
Your profit swings a lot or is about to drop. Payroll and filing costs continue in a slow year. Your salary can change as your work does, but it still has to be reasonable.
You expect a loss, or you’re still getting started. With no profit, there’s no payroll tax to save.
Your state or city taxes S corps differently. A few places, including California, New York City, and Washington, D.C., tax S corps at the business level or don’t fully recognize the election. The math has to include that.
You have a co-owner and want to split profit unevenly. An S corp’s distributions generally have to follow each owner’s percentage. If you and a partner want a different split, an S corp may not fit.
You plan to close or sell the business soon. The setup costs and the harder exit can outweigh a year or two of savings.

For some owners, it helps more than the payroll math shows. If your income is high enough that the federal cap on deducting state and local taxes limits you, many states let an S corp pay state income tax at the business level, where it’s deductible on the federal return. That option generally isn’t open to a sole proprietor.

7. If it makes sense, the 2027 timeline

If your numbers say yes, this is the order I’d follow:

Run the comparison with your real numbers this fall. Use this year’s profit and a realistic salary.
Form an LLC or corporation, if you don’t have one. If you’re a sole proprietor with no LLC, this comes first.
Set your salary and write down how you got there.
Set up payroll before your first 2027 paycheck. That includes a payroll service and your state withholding and unemployment accounts.
File Form 2553 by March 15, 2027. Every owner signs it. Keep proof that you filed. You should hear back from the IRS within about 60 days, and if you haven’t heard in two months, follow up.
Adjust your estimated payments. Tax withheld from your salary covers part of what you owe. You may still need estimated payments for the profit above your salary.
Set up reimbursements and health insurance through the business. A written accountable plan, and premiums paid or reimbursed by the S corp.
Tell your bookkeeper before January. Salary, payroll taxes, distributions, and reimbursements all get recorded differently from here on.

If you’re forming a new business in 2027, the 2 months and 15 days count from the start of its first tax year, generally the earliest date it had owners, had assets, or began doing business. That can be before your first sale, so confirm the date rather than assuming March 15. And if a deadline slips past, the IRS does offer relief for late elections when there’s a reasonable cause, but it takes extra paperwork, so don’t count on it.

8. Who does what

An S corp works best when every piece has an owner. It usually splits like this:

Who	What they handle
You	Decide whether to elect, approve your salary, sign Form 2553, keep business and personal money separate, and turn in receipts for reimbursement
Your bookkeeper	Record payroll, distributions, and reimbursements correctly, close the books each month, and send reports to your tax pro
Your payroll provider	Pay your salary, withhold and deposit payroll taxes, and file the payroll returns and your W-2
Your tax pro	Run the comparison, help set a reasonable salary, file the election, prepare the S corp and personal returns, adjust your estimated payments, and revisit the plan as your profit changes

Some bookkeepers also run payroll. Who does each piece matters less than knowing it’s covered.

Your S corp checklist

Pull this year’s profit, not revenue
Estimate a reasonable salary for the work you do
Get real quotes for payroll and tax prep
Check how your state and city treat S corps
Decide whether retirement savings or health insurance change the math
If it makes sense: form the LLC, set up payroll, and file Form 2553 by March 15, 2027
Tell your bookkeeper before January

If you want help

Every engagement starts with my Tax Review. It includes a first look at whether an S corporation could make sense for you, using your actual numbers, along with a ballpark of this year’s taxes, a look at your most recent return for anything missed, and a review of your IRS account with your authorization. It comes as a written report with your next steps in order and an optional follow-up call.

If an S corp is the right move, the Year-Round Tax Plan covers the election and setting a reasonable salary, while your bookkeeper or a payroll provider runs payroll. I work from your monthly reports, so your salary, estimated payments, and plan stay on track all year.

To have time to set things up for January 1, 2027, reach out by November 30, 2026.

Request a tax review. Use whatever name you’d like me to call you. Please don’t send tax documents through the website form. If we work together, I’ll send you a secure way to share them.

This article is general information about U.S. federal taxes, not advice for your situation. Tax rules change, state rules differ, and whether an S corp makes sense depends on your income, business, state, and other details.

IRS sources

State and city sources

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