To file as an S corp, submit IRS Form 2553 (Election by a Small Business Corporation) with signed consent from every shareholder, no later than two months and 15 days after the start of the tax year you want the election to cover. There is no filing fee. The form goes by mail or fax to one of two IRS Service Centers, and processing typically takes about 60 days.
The paperwork itself is short. What trips people up is qualifying in the first place, gathering every shareholder’s signature, and hitting the deadline.
Confirm Your Business Qualifies
Before filling out anything, check that your business meets every requirement in 26 U.S.C. ยง 1361(b). Failing one disqualifies the whole election.1Office of the Law Revision Counsel. 26 USC 1361 – S Corporation Defined
- The business must be a domestic corporation. C corporations and LLCs that elect corporate treatment both qualify.
- There can be no more than 100 shareholders. Family members (a common ancestor, all lineal descendants, and their spouses or former spouses) count as one shareholder.
- Every shareholder must be an individual, a qualifying trust, or an estate. Partnerships, other corporations, and nonresident aliens cannot hold shares.2Internal Revenue Service. S Corporations
- The corporation can have only one class of stock. Different voting rights among common shares are allowed, but distribution and liquidation rights must be identical across shares.
Some businesses are ineligible no matter how they’re organized: insurance companies, domestic international sales corporations, and financial institutions using the reserve method for bad debts.
What to Gather Before Filling Out Form 2553
Download Form 2553 from the IRS website. Before you start, pull together the following.3Internal Revenue Service. Instructions for Form 2553
Business details. Legal name, Employer Identification Number, state of incorporation, and date of incorporation. If you don’t yet have an EIN, apply through Form SS-4 or online at IRS.gov first.
Effective date. The date you want pass-through taxation to begin, entered on line E.
Tax year. Most small businesses use the calendar year ending December 31. If you want a fiscal year instead, you’ll need to justify it in Part II.4Internal Revenue Service. Form 2553 – Election by a Small Business Corporation
Shareholder consent (Part I, columns J through N). Every person holding stock on the filing date must sign the form or a separate consent statement. For each shareholder, you’ll need full legal name, home address, Social Security number (or EIN for a trust or estate), the number of shares or ownership percentage, and the date they acquired their interest.
One detail that catches owners off guard: if a shareholder lives in a community property state, their spouse may also need to sign the consent section even if the spouse isn’t listed as a shareholder. Community property laws can give the spouse a legal interest in the stock or its income, and the IRS wants both signatures in that situation.
Deadline and Where to Send It
Form 2553 must reach the IRS no later than two months and 15 days after the beginning of the tax year you want the election to cover. For a calendar-year business seeking S corp status for 2026, that means the form is due by March 16, 2026. You can also file at any point during the preceding tax year.5Internal Revenue Service. Instructions for Form 2553
Filing is free. Send the original (not a photocopy) by mail or fax to the Service Center assigned to your state.6Internal Revenue Service. Where to File Your Taxes for Form 2553
- Kansas City, MO 64999 (fax: 855-887-7734), for businesses in Connecticut, Delaware, D.C., Georgia, Illinois, Indiana, Kentucky, Maine, Maryland, Massachusetts, Michigan, New Hampshire, New Jersey, New York, North Carolina, Ohio, Pennsylvania, Rhode Island, South Carolina, Tennessee, Vermont, Virginia, West Virginia, and Wisconsin.
- Ogden, UT 84201 (fax: 855-214-7520), for businesses in Alabama, Alaska, Arizona, Arkansas, California, Colorado, Florida, Hawaii, Idaho, Iowa, Kansas, Louisiana, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Mexico, North Dakota, Oklahoma, Oregon, South Dakota, Texas, Utah, Washington, and Wyoming.
If you fax it, save the confirmation as proof of timely filing. Form 2553 cannot be e-filed directly, though some tax software attaches it when the corporation files its first return electronically.
If You Missed the Deadline
A late filing does not automatically bump you to the next tax year. Revenue Procedure 2013-30 lets the IRS Service Center grant late election relief if you meet all of these conditions:7Internal Revenue Service. Late Election Relief
- The entity intended to be an S corporation as of the requested effective date and was otherwise eligible.
- The only reason it failed to qualify was the late filing.
- There is reasonable cause for the delay.
- The entity and all shareholders reported income consistently with S corp status for every year since the intended effective date.
- Fewer than 3 years and 75 days have passed since the intended effective date.
To claim this relief, write “FILED PURSUANT TO REV. PROC. 2013-30” at the top of Form 2553 and send it to the same Service Center you’d normally use. If you fall outside the 3-year-and-75-day window, you can request a private letter ruling from the IRS national office, but that carries a $6,200 user fee.5Internal Revenue Service. Instructions for Form 2553
What Happens After You File
The IRS generally takes about 60 days to process Form 2553. If it’s accepted, you’ll receive Notice CP261 confirming the election and its effective date. Keep this notice in your permanent corporate records; it’s your proof of S corp status if questions come up later.8Internal Revenue Service. Understanding Your CP261 Notice
If the election is denied, the rejection notice will explain the problem. The usual culprits are missing shareholder signatures, an ineligible shareholder, or a late filing. Fix the issue and refile if you can. Heard nothing after 60 days? Call the IRS Business and Specialty Tax Line to check status.
What Changes Once You’re an S Corp
The election shifts how you pay yourself and how the business reports income. Two areas matter most in the first year.
Reasonable Compensation
The main financial reason to elect S corp status is splitting income between salary (subject to payroll taxes) and distributions (not subject to payroll taxes). Self-employment tax runs 15.3% on net business income for a sole proprietor or standard LLC: the combined employer and employee shares of Social Security at 6.2% each and Medicare at 1.45% each. Social Security tax in 2026 applies on wages up to $184,500.9Social Security Administration. Contribution and Benefit Base
With an S corp, only your salary portion carries FICA. If the business earns $150,000 and you pay yourself a $90,000 salary, the other $60,000 passes through free of the 15.3% payroll tax.
The catch: the IRS requires the salary to be “reasonable compensation” for the work you actually do. Paying yourself $10,000 and taking the rest as distributions doesn’t fly. The IRS weighs the time you devote to the business, your training and experience, what comparable businesses pay for similar roles, and whether company income comes primarily from your personal services or from other employees and equipment.10Internal Revenue Service. S Corporation Compensation and Medical Insurance Issues
If the IRS decides your salary is unreasonably low, it can reclassify distributions as wages retroactively, triggering back payroll taxes, interest, and penalties. This is the single most audited issue for S corporations.11Internal Revenue Service. Instructions for Form 1120-S
Annual Returns and Estimated Tax
The corporation files Form 1120-S each year, reporting income, deductions, and credits. For calendar-year S corps, Form 1120-S is due March 15 (March 16 when the 15th falls on a weekend). An automatic six-month extension is available via Form 7004 filed by the same date.
Each shareholder receives a Schedule K-1 reporting their share of the corporation’s income and deductions, and reports those amounts on their personal return whether or not any cash was actually distributed.12Internal Revenue Service. 2025 Shareholders Instructions for Schedule K-1 Form 1120-S Being taxed on income you never received in cash is a real possibility if the business retains earnings.
Because distributions have no tax withheld, shareholders typically owe quarterly estimated tax payments. For 2026, the IRS expects estimated payments if you’ll owe at least $1,000 after withholding and credits and your withholding covers less than 90% of your 2026 liability or 100% of your 2025 liability (110% if your 2025 adjusted gross income exceeded $150,000). Due dates are April 15, June 15, and September 15, 2026, and January 15, 2027.13Internal Revenue Service. 2026 Form 1040-ES Estimated Tax for Individuals
Late filing of Form 1120-S runs $250 per shareholder per month, up to 12 months. Incorrect K-1 information can add a $340 penalty per affected K-1.11Internal Revenue Service. Instructions for Form 1120-S
Don’t Forget the State
Federal approval doesn’t automatically carry over to your state. Many states honor the federal election without further paperwork, but others require a separate state-level S corp election with their department of revenue, sometimes on a different deadline. Even in states that recognize the election, some impose a minimum franchise tax or entity-level tax on S corps regardless of profit. Separately, most states require annual reports or franchise tax filings with the secretary of state; missing those can lead to administrative dissolution, which would end your S corp election. Check with your state tax authority so the federal election isn’t undone by a state-level filing you never knew about.