An LLC is a legal structure. An S corporation is a federal tax election that an LLC can make. It can lower self-employment tax once profit is high enough, but it adds payroll, a separate tax return and rules about paying yourself a reasonable salary. The election has a deadline.
LLC and S corp are not opposites
An LLC is created under state law and decides liability protection and how the business is organized. An S corporation is a federal tax classification. An eligible LLC can elect to be taxed as an S corporation. So the real question is not “LLC or S corp?” but “should my LLC elect S corporation tax treatment?”
How each is taxed
| Item | LLC (default) | LLC taxed as S corp |
|---|---|---|
| Business income | Passes through to you | Passes through to you |
| Self-employment tax | 15.3% on net earnings (up to the Social Security wage base, plus Medicare above it) | Payroll tax on your reasonable salary only; distributions are not subject to it |
| Payroll | Not required for owners | Required: you must pay yourself a reasonable salary |
| Tax return | Schedule C (single owner) or partnership return | Separate business return (Form 1120-S) plus K-1s |
| Complexity and cost | Lower | Higher |
A simple example
Say your LLC earns $100,000 in net profit and a reasonable salary for your work is $50,000. This is a simplified illustration, not a prediction.
| Item | Default LLC | S corp election |
|---|---|---|
| Self-employment or payroll tax | About $14,130 (15.3% × 92.35% of profit) | About $7,650 (15.3% × $50,000 salary) |
| Approximate difference | About $6,480 less payroll tax with the S corp, before added costs | |
The savings are real but not free. You pay for payroll processing and a separate tax return. The IRS expects owners who work in the business to receive reasonable compensation before they take distributions, and it can reclassify distributions as wages if the salary is too low. There is no single formula for “reasonable,” so we document it.
When an S corp makes sense
It is usually worth modeling once net profit is consistently well above a typical salary for your role, which for many owners is somewhere around $50,000 to $60,000 or more. That is a rule of thumb, not a rule. It tends to fit when:
- You work actively in the business and earn steady profit.
- You are comfortable running payroll or paying a service to run it.
- The tax savings clearly exceed the added administrative cost.
When it does not
It is a poor fit if profit is low or irregular, if most of your income is passive, or if an owner is not eligible to be an S corporation shareholder. Eligibility rules apply to who can own the company. The costs of payroll and an extra return can also erase the savings at lower profit.
The deadline for the election
An existing LLC files Form 2553 with the IRS. It must generally be filed no more than 2 months and 15 days after the beginning of the tax year the election is to take effect, or at any time during the preceding tax year. For a calendar-year business that usually means March 15. Late-election relief may be available under IRS Revenue Procedure 2013-30. Your LLC needs an EIN first. If you are forming a new LLC, we can set this up from day one. See our tax planning service and the Standard package.
Pennsylvania taxes
Pennsylvania taxes personal income at a flat 3.07%, and income from an LLC or S corporation passes through to the owner’s return. Local earned income and net profits taxes depend on your municipality and can add wrinkles, which is another reason we model your actual numbers. Read more about our tax consulting.
Questions
Q01Is an LLC or an S corp better?
They are not alternatives. An LLC is a legal structure, and an S corporation is a tax election an LLC can make. The right choice depends on your profit, your costs and your goals.
Q02Can an LLC be taxed as an S corporation?
Yes. An eligible LLC can file Form 2553 to be taxed as an S corporation while remaining an LLC under state law.
Q03What is a reasonable salary for an S corp owner?
The IRS expects an owner who works in the business to be paid reasonable compensation for the services performed before taking distributions. What counts as reasonable depends on your role, industry and market pay.
Q04Can I switch back from an S corp?
Yes, but there are rules and waiting periods, so it is best to get the decision right up front.
Sources
- IRS: instructions for Form 2553
- IRS: Revenue Procedure 2013-30 (late S-corporation elections)
- IRS: S corporation employees, shareholders and officers
- IRS: single member limited liability companies
- PA Department of Revenue: personal income tax rates
General information based on publicly available rules as of October 2026. Not legal or tax advice. Fees, deadlines and requirements change; confirm current details with the agency or a licensed professional.