S-Corp Election in Wisconsin (Form 2553)
An S corporation election is made with the IRS on Form 2553, not with any Wisconsin agency. Wisconsin follows the federal election: a corporation or LLC that is an S corporation federally is a tax-option (S) corporation in Wisconsin and files Form 5S with the Wisconsin Department of Revenue.
Quick Answer
- Federal form
- IRS Form 2553, Election by a Small Business Corporation
- Wisconsin form
- Form 5S, Wisconsin Tax-Option (S) Corporation Franchise or Income Tax Return
- Wisconsin term
- Tax-option (S) corporation
- Separate state election?
- No separate Wisconsin S election - the federal election carries over
- Entity-level tax option
- Elect by checking box 7 in Part A of Form 5S
- Consent needed
- Shareholders holding more than 50% of shares (s. 71.365(4m)(a), Wis. Stats.)
- Entity-level computation
- Schedule 5S-ET
What the S Election Actually Changes
An S corporation is a tax classification, not an entity type. A Wisconsin LLC that elects S treatment is still an LLC on the Department of Financial Institutions record; a Wisconsin corporation that elects it is still a corporation. What changes is how profit is taxed.
The practical motive is payroll tax. An LLC taxed by default sends all net profit to the owner's Schedule SE, where the 15.3% self-employment tax - 12.4% Social Security and 2.9% Medicare - applies. An S corporation pays its owner-employee reasonable W-2 wages, subject to payroll tax, and can distribute the remaining profit without self-employment tax. The savings are real once profit meaningfully exceeds a reasonable salary; below that point the added payroll and return costs usually consume them. Weigh it at S-corp vs LLC and see self-employment tax.
Eligibility Rules
Federal law limits who may be an S corporation. The entity must be a domestic corporation or an eligible entity treated as one, must have no more than 100 shareholders, must have only allowable shareholders - individuals, certain trusts, and estates, but not partnerships, corporations, or non-resident alien shareholders - and must have only one class of stock.
The one-class-of-stock rule is where LLCs most often trip. An operating agreement with preferred returns, tiered distributions, or special allocations can create a second economic class and invalidate the election. Review your Wisconsin operating agreement against the requirement before you file.
Filing Form 2553 and the Deadline
The election is made on Form 2553, Election by a Small Business Corporation, which the IRS describes as the form used to make an election under section 1362(a) to be an S corporation. Every shareholder - and, in a community property context, a spouse with an interest - must consent by signing.
Timing controls which year the election takes effect. Form 2553 is filed either during the tax year preceding the year the election is to take effect, or no later than two months and 15 days after the beginning of the tax year the election is to take effect. Confirm the current deadline language and the correct service center in the IRS instructions for Form 2553 - the filing address changed in 2019 for filers in certain states.
A late election is not automatically fatal. The IRS provides relief procedures for late S corporation elections where the entity intended to be an S corporation and has reasonable cause; the request is generally made on Form 2553 itself with the required statement attached.
Wisconsin Follows the Federal Election
Wisconsin does not run a separate state-level S election. A corporation with a valid federal S election is a tax-option (S) corporation for Wisconsin purposes, and an LLC treated federally as an S corporation is treated the same way by the Department of Revenue. The Department's Publication 102 sets out the Wisconsin treatment of tax-option (S) corporations and their shareholders in detail.
The state return is Form 5S, Wisconsin Tax-Option (S) Corporation Franchise or Income Tax Return. Shareholders receive Wisconsin schedules reporting their share of income, and report it on their Wisconsin individual returns unless the entity-level election described below is made. See Wisconsin LLC tax filing.
Wisconsin's Entity-Level Tax Election
Wisconsin offers a second, separate election that is unique to the state. A tax-option (S) corporation may elect to be taxed at the entity level rather than passing income through to shareholders. The election is made by checking box 7 in Part A of Form 5S.
Two conditions govern it. First, the electing corporation must have consent from shareholders holding an aggregate of more than 50 percent of the shares on the day of the election, under s. 71.365(4m)(a), Wis. Stats. Second, the election must be made annually, on or before the extended due date of the Wisconsin Form 5S - it does not carry forward automatically.
An electing entity computes the entity-level tax on Schedule 5S-ET, which captures the items that would have been reportable by shareholders had the election not been made. For the year of the election, shareholders do not include their proportionate share of those items in Wisconsin adjusted gross income. The usual motive is the federal deduction for state taxes paid at the entity level; whether it helps depends on each shareholder's situation.
Payroll: The Obligation That Comes With the Election
The S election creates a payroll obligation that did not exist before. An owner who works in the business becomes an employee and must be paid reasonable compensation as W-2 wages before distributions. That means registering for federal payroll deposits with the EIN, registering Wisconsin withholding with the Department of Revenue, and adding unemployment insurance.
Understating the salary to shrink payroll tax is the most audited feature of the structure. Reasonableness is judged against what a comparable employee would be paid for the same duties, industry, hours, and experience. Document how the figure was set and revisit it as the business grows.
Cost, Complexity, and When It Pays
The S election adds recurring cost: a payroll service or the time to run payroll, a federal Form 1120-S, a Wisconsin Form 5S, and shareholder schedules. Those costs are largely fixed, which is why the arithmetic favors the election only above a certain profit level.
| Feature | LLC taxed by default | S corporation election |
|---|---|---|
| Federal return | Schedule C or Form 1065 | Form 1120-S |
| Wisconsin return | Owner or partnership return | Form 5S (tax-option S corporation) |
| Owner pay | Draws or distributions | Reasonable W-2 wages plus distributions |
| Self-employment tax | 15.3% on net earnings | Payroll tax on wages only |
| Payroll filings | Only if there are employees | Always, for the owner-employee |
| Entity-level tax option | Not applicable | Available by checking box 7 on Form 5S |
See how to form an LLC in Wisconsin, Wisconsin Articles of Organization, and Wisconsin LLC cost for the entity side.
Keeping the Election Valid
An S election is easy to break. Admitting an ineligible shareholder - a partnership, a corporation, or a non-resident alien - terminates it. So can creating a second class of stock through an amended operating agreement. So can exceeding the 100-shareholder limit. A terminated election generally cannot be re-made for five years without IRS consent.
Keep the state record clean too: file the Wisconsin annual report, maintain a Wisconsin registered agent, and keep any business licenses current. If you wind the company down, revoke or terminate the election in the proper order - see how to dissolve an LLC in Wisconsin and the glossary.
Frequently Asked Questions
Is there a separate Wisconsin S corporation election?
No. Wisconsin follows the federal election. A corporation or LLC with a valid federal S election is a tax-option (S) corporation for Wisconsin purposes and files Form 5S with the Department of Revenue. The only Wisconsin-specific election is the separate entity-level tax election on Form 5S.
What form makes the S corporation election?
IRS Form 2553, Election by a Small Business Corporation, which makes the election under section 1362(a) to be an S corporation. All shareholders must consent by signing. The filing address depends on the entity's location and changed in 2019 for filers in certain states.
When is Form 2553 due?
File it during the tax year preceding the year the election is to take effect, or no later than two months and 15 days after the beginning of the tax year the election is to take effect. The IRS offers relief procedures for late elections where the entity intended S treatment and has reasonable cause.
How does Wisconsin's entity-level tax election work?
A tax-option (S) corporation elects to be taxed at the entity level by checking box 7 in Part A of Form 5S. Shareholders holding more than 50 percent of the shares must consent under s. 71.365(4m)(a), Wis. Stats. The election must be made annually by the extended due date of Form 5S.
What is Schedule 5S-ET used for?
An electing tax-option (S) corporation, or an LLC treated as one, uses Schedule 5S-ET to compute the Wisconsin entity-level tax on the items that would otherwise have been reportable by the shareholders. For the election year, shareholders exclude their proportionate share of those items.
Does electing S status eliminate self-employment tax?
It changes the base, not the concept. Owner-employees must be paid reasonable W-2 wages, which carry payroll tax; only the remaining distributed profit escapes self-employment tax. Setting an unreasonably low salary to shrink payroll tax is the most commonly challenged aspect of the structure.
Related
- S-corp vs LLC
- How to form an LLC in Wisconsin
- Wisconsin Articles of Organization
- Wisconsin LLC tax filing
- Wisconsin annual report
- Wisconsin registered agent requirements
- Wisconsin LLC cost
- Wisconsin business licenses
- Self-employment tax explained
- How to get an EIN
Sources
- IRS - About Form 2553, Election by a Small Business Corporation (section 1362(a) election; filing addresses).
- IRS - S Corporations (eligibility requirements).
- IRS - S Corporation Compensation and Medical Insurance Issues (reasonable compensation).
- Wisconsin Department of Revenue - Pass-Through Entity-Level Tax: Tax-Option (S) Corporation General Election Questions (box 7 of Form 5S; more than 50% shareholder consent; annual election by extended due date).
- Wisconsin Department of Revenue - Publication 102, Wisconsin Tax Treatment of Tax-Option (S) Corporations and Their Shareholders.
- Wisconsin Department of Revenue - 2025 Schedule 5S-ET Instructions (entity-level tax computation).
- Wisconsin Department of Revenue - Form 5S Instructions.
- Wisconsin Legislature - Wis. Stat. s. 71.365 (tax-option corporations; entity-level election).
- IRS - Self-Employment Tax (15.3% rate).
- IRS - About Form 1120-S.
LegalGlass provides general information for educational purposes and is not legal advice, is not a law firm, and is not a substitute for advice from a licensed attorney or tax professional. Laws, fees, and thresholds change; verify current amounts with the Wisconsin Department of Revenue and the Internal Revenue Service before acting.