An LLC is a legal form your state creates. An S corporation is a federal tax election you file with the IRS. They sit on different lists, so your LLC keeps its state registration and can elect S corporation taxation at the same time. By default a single-member LLC is treated as part of the owner's own return, which the IRS calls a disregarded entity, and a domestic LLC with two or more members is classified as a partnership, with members treated as self-employed and paying self-employment tax on their share of the profits. The election relabels that money: part of your take becomes a reasonable salary carrying payroll taxes, and the rest is a distribution carrying none. That split costs you running payroll, filing a separate return, and paying yourself a salary the IRS will accept as reasonable. None of what follows is tax or legal advice; the rules come from IRS pages plus two state examples, checked October 2026.
What your LLC is to the IRS today
The IRS treats an LLC as a corporation, a partnership, or as part of the owner's return, depending on the number of members and the elections the LLC files. A single-member LLC is the disregarded entity case, so the profit is reported on your own return. A domestic LLC with two or more members is classified as a partnership for federal income tax purposes unless it files Form 8832 and elects to be treated as a corporation. The Small Business Administration states the practical half: an LLC protects owners from personal liability in most instances, its profits and losses pass through to the owner's personal income, and members are treated as self-employed and pay self-employment tax on their share of the profits.
One detail matters the moment the firm hires anyone. For employment tax and certain excise taxes, a single-member LLC is still considered a separate entity even though it is disregarded for income tax. A solo firm with one employee already carries an employer's filing obligations while its profit still sits on the owner's return. An LLC is a business structure allowed by state statute, and each state writes its own rules, so the useful comparison is between two federal tax treatments of one company.
Exhibit 1
The election moves the owner's pay onto payroll and adds a separate company return
How the election is filed, and the deadline that gets missed
An LLC that wants S corporation status files Form 2553, Election by a Small Business Corporation, and does not need to file Form 8832 first. Form 2553 must 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 tax year before that year. For a calendar-year LLC electing to be an S corporation starting January 1, the deadline is March 15 of the year the election takes effect.
Every shareholder must consent to the election, and an unsigned Form 2553 is not treated as timely filed. In a two-owner firm both signatures have to be on the form before it goes, which is how a January decision slips past mid-March. The IRS instructions for Form 2553 in use are the December 2020 revision.
A missed deadline can be fixed, and the fix has conditions. Late S corporation elections can be fixed under Rev. Proc. 2013-30 if the owner intended to make the election, has reasonable cause, and everyone reported income as an S corporation. The relief window is 3 years and 75 days from the effective date entered on the election, and a late filing under this procedure is marked "FILED PURSUANT TO REV. PROC. 2013-30" at the top of Form 2553. Worked from that window, an election meant to take effect January 1, 2024 has a relief window that closes on March 17, 2027. If a filing does not qualify under Rev. Proc. 2013-30, the remaining route is a private letter ruling, which carries a user fee.
The eligibility tests that bite at a small firm
To qualify, the business must be a domestic corporation, have only allowable shareholders, have no more than 100 shareholders, have only one class of stock, and not be an ineligible corporation such as a bank or insurance company. At a firm under ten people the shareholder count is not the constraint. Two other tests do reach small firms. Partnerships, corporations and non-resident alien shareholders cannot be S corporation shareholders, so a holding company, a partner LLC, or an owner who is a non-resident alien changes what the form can say. And the corporation must have only one class of stock, a test the Form 2553 instructions state separately from the shareholder count.
S corporation income passes through to shareholders and is taxed at their individual income tax rates, so an S corporation avoids double taxation on corporate income. The pass-through half is what your LLC already does. The salary is the new part.
Reasonable compensation governs everything after the election
An S corporation must pay its owner-employee reasonable compensation for services before it can make non-wage distributions. Distributions and other payments by an S corporation to a corporate officer must be treated as wages to the extent the amounts are reasonable compensation for services rendered to the corporation, and the IRS can reclassify distributions to a shareholder-employee as wages, which makes them subject to employment taxes.
Your own books decide this outcome. A firm that pays its owner a salary in line with what the job is worth, then distributes the surplus, keeps the split. A firm that pays no salary and takes everything as distribution has built the reclassification into its own records. There is no set formula for reasonable compensation; courts and the IRS look at the facts of each case, including training, duties, time devoted to the business, what comparable businesses pay, and payments to non-shareholder employees.
That last factor is the one a growing service firm controls. If you already pay an office lead, a project manager, or a senior designer, that salary is evidence about what your own hours are worth. A firm that pays its second employee well and its owner nothing has put the comparable salary in its own payroll records.
Where the self-employment tax sits in 2026
Self-employment tax consists of 12.4 percent for Social Security and 2.9 percent for Medicare, and added together the two parts come to 15.3 percent of net earnings from self-employment. The sum does not fall on all income: only net earnings up to the annual Social Security wage base are subject to the Social Security portion, and all net earnings are subject to the Medicare portion. The Social Security wage base is $184,500 for 2026 and $192,300 for 2027. A member of a single-member LLC and a member of a multi-member LLC treated as a partnership are self-employed for this purpose.
Wages carry the same two components through payroll, so the salary portion earns no relief. The distribution side carries no Social Security amount at all. The Additional Medicare Tax rate is 0.9 percent, and it applies above $250,000 of income for married filing jointly and $200,000 for single filers. An employer must withhold the Additional Medicare Tax on wages over $200,000 in a calendar year, regardless of the employee's filing status, which is a payroll withholding trigger and a different number from the taxpayer's own threshold.
What the election adds to your calendar
Once the owner is on a salary, the firm becomes an employer with payroll obligations: Form 941 each quarter and Form 940 once a year for federal unemployment tax. There are two employment tax deposit schedules, monthly and semi-weekly, and you determine which one applies before the calendar year begins. Federal tax deposits must be made by electronic funds transfer. A W-2 must be furnished to the employee and filed with the Social Security Administration by January 31. Federal unemployment tax is paid only by the employer and is not withheld from the employee's wages.
The income tax return moves off your personal return. An S corporation files Form 1120-S by the 15th day of the third month after the end of its tax year, and if that due date falls on a Saturday, Sunday, or legal holiday, the return can be filed on the next day that is not one. For a calendar-year S corporation, the tax year 2026 return is due Monday, March 15, 2027; no IRS page prints that date yet, because the instructions in use cover tax year 2025, and the date follows from that 15-day rule. An extension is requested on Form 7004 and must be filed by the regular due date of the return. Each owner receives Schedule K-1 (Form 1120-S), which reports that shareholder's share of income, deductions and credits, and reports it on Form 1040 with Schedule E. A personal return built on a K-1 waits for the company's books to close, which is a good argument for the monthly close that keeps December short. The owner's own payments split in two: wages arrive with withholding every payroll, and the tax on the distribution side is reported on Form 1040 with Schedule E, which is also where quarterly estimated taxes are handled.
Health insurance has its own rule. Premiums an S corporation pays for a shareholder who owns more than 2 percent are reported as wages on that owner's W-2 in Box 1. Those premiums are deductible by the S corporation and are not subject to Social Security, Medicare or unemployment taxes when the plan covers a class of employees. The shareholder can generally take the premium as an above-the-line deduction, unless the shareholder or spouse can participate in subsidized health coverage. Premiums for a 2-percent shareholder must run through the W-2; a Schedule K-1 or Form 1099 is not the right place to report them.
Exhibit 2
A January election is filed by March 15 and then runs payroll deposits every quarter of its first year
The qualified business income deduction sits on both lanes
The qualified business income deduction lets eligible owners of a pass-through business deduct up to 20 percent of qualified business income, and the deduction was made permanent by the law signed on July 4, 2025. Many owners of a sole proprietorship, a partnership or an S corporation may be eligible for it, so it does not tip the election by itself. Two things about it move under the election. Salary an owner receives as reasonable compensation from an S corporation is not qualified business income, so every dollar moved into salary shrinks the base the 20 percent applies to. And the deduction carries income thresholds a profitable small firm can cross: for tax years beginning in 2026, the taxable income threshold at which the limitations begin is $403,500 for married filing jointly and $201,750 for all other returns, with phase-in ceilings of $553,500 and $276,750. For tax years beginning after 2025 there is a minimum deduction of $400 for taxpayers with at least $1,000 of qualified business income. These thresholds are indexed yearly, so check the current revenue procedure before relying on the 2026 numbers.
The break-even, said without invented dollars
The tax the election removes is a percentage of the money you take as distribution, so it grows as profit rises above a reasonable salary. The costs the election adds are mostly fixed: payroll service, a separate corporate return, a W-2, state filings, and the time to keep the payroll calendar honest. A fixed cost spread over a large profit is small. Spread over a thin profit, it is the entire decision. So below some level of profit the election loses money every year, and above it the saving compounds while the costs stay flat. Where your firm sits on that curve depends on profit, filing status, state, and the salary your CPA will defend, which is why any savings figure written here would be a made-up number. A firm whose profit barely exceeds what the owner's job is worth gains almost nothing and takes on every filing. A firm with a large surplus over that salary has a real decision to make.
What the election leaves where it is
The SBA describes S corporation status as a tax status obtained by filing with the IRS, in a process separate from registering the business with the state. An LLC protects owners from personal liability in most instances; how your particular entity's protections read once the election is in place is a question for the attorney who formed it, and we do not answer it.
What does change at the desk is the bookkeeping. Payroll means a wage line, employer tax expense, a deposit calendar with fixed dates, and a W-2 that has to reconcile to the payroll register in January. A monthly bookkeeping rhythm has to absorb payroll and its deposits, because payroll deposits run on their own schedule. Contractor paperwork keeps running on its own track, and the owner sits outside it, since owner pay is wages: the owner of an S corporation is paid on payroll, off the forms we covered in the 1099-NEC threshold for 2026.
Exhibit 3
The election adds filings and a payroll calendar and leaves the state registration standing
Your state may not follow the federal election
States do not treat S corporations identically; most follow the federal treatment, some tax S corporations above a limit, and some do not recognize the election at all.
Florida does not impose a personal income tax, so an owner's share of the firm's profit is not taxed by the state. Florida taxes corporations, and an S corporation files the Florida corporate return only in years it owes federal tax at the corporate level, entering only the income subject to federal tax at the corporate level. The Florida corporate income tax rate is 5.5 percent, with up to $50,000 of Florida net income exempt, and for a December 31 year end the Florida corporate return is due on or before May 1.
California charges S corporations a 1.5 percent tax on California source income and an annual $800 minimum franchise tax, with the minimum waived for the first taxable year of a newly formed or qualified S corporation. That waiver covers the minimum; net income in the first year is still taxed at 1.5 percent.
New York does not automatically follow the federal S election; the corporation files Form CT-6 to elect New York S corporation treatment. A federal S corporation that does not make the New York election pays the same corporate franchise taxes as a C corporation in New York. New York City has no S corporation election and does not recognize the New York State one, so a federal S corporation doing business in the city pays the General Corporation Tax.
Questions to put to your CPA before filing Form 2553
- What salary range will you defend for my training, my duties and my hours, and what document records it?
- Which employment tax deposit schedule will this firm be on, and who makes the electronic deposits?
- Who files Form 941, Form 940, the W-2 and Form 1120-S, and what do those four cost us each year?
- Does our state recognize the federal election, does it require its own form, and does it carry a minimum tax?
- When will I receive my Schedule K-1, and how late can my personal return wait for it?
- How does the salary change my qualified business income deduction at my taxable income?
- Is our health premium set up to run through Box 1 of the W-2?
- If the election is late, do we qualify under Rev. Proc. 2013-30, and what is our reasonable cause?
Work the checklist in this order: confirm which eligibility tests reach your owners, agree a salary in writing with your CPA, price one year of payroll service and one corporate return, read your state's rule, then file Form 2553 signed by every shareholder by March 15 for a January 1 start. Filing it during the prior tax year takes the deadline off the list altogether. If the books are not tidy enough today to carry a wage line and a deposit calendar, that is the work to do first, and it is the part our bookkeeping service covers.