# S-corporation

Canonical URL: https://olomon.com/financial-glossary/s-corporation
Markdown twin: https://olomon.com/financial-glossary/s-corporation/llms.txt
Category: Taxes & Business (https://olomon.com/financial-glossary/categories/taxes-business)
Also known as: S-corp, Subchapter S corporation
Last updated: 2026-05-03

## Definition

An S-corporation is a corporation that has elected, by filing IRS Form 2553, to pass corporate income, losses, deductions, and credits through to its shareholders for federal tax purposes — avoiding the double taxation of a C-corporation. S-corps must meet ownership and capital structure requirements, including a 100-shareholder limit and U.S.-citizen / resident alien shareholders.

## Key takeaways

- Election made on IRS Form 2553, generally by March 15 of the year the election is to take effect.
- Shareholders must be U.S. citizens or resident aliens; certain trusts and estates also qualify.
- S-corps may not have more than 100 shareholders or more than one class of stock.
- Owner-employees must take “reasonable compensation” as W-2 wages before taking distributions.

## How Olomon thinks about this

_The following section is Olomon's first-party perspective, informed by our work building a financial system of record. It is intentionally separated from the neutral definitional content above._

Olomon is built to handle households with multiple operating entities. For each S-corp, you can store the election letter, K-1s, distribution history, and ownership table alongside the household balance sheet — so the entity, its owners, and the cash flowing between them are all visible at once.

## Quick facts

| Fact | Value | As of |
|------|-------|-------|
| Maximum shareholders | 100 | — |
| Eligible shareholders | U.S. citizens / resident aliens, certain trusts + estates | — |
| Stock classes allowed | One class of stock (voting differences allowed) | — |
| Election form | IRS Form 2553 | — |
| Election deadline | By March 15 (for calendar-year entities) | — |
| Annual tax return | IRS Form 1120-S + Schedule K-1 to shareholders | — |

## In-depth definition

S-corporation status is a powerful tax structure for small operating businesses. The election turns the entity into a pass-through for federal tax purposes while preserving the corporate liability shield. The most common pitfall is failing to pay the owner-employee reasonable compensation — a frequent IRS audit issue.

## How to elect S-corporation status

The federal procedural steps for an existing eligible corporation or LLC to elect S-corporation taxation.

1. **Confirm eligibility** — Verify the entity is a domestic corporation (or an LLC eligible to elect corporate taxation), has ≤ 100 shareholders, has only U.S. citizen / resident alien individual shareholders (plus certain trusts and estates), and has only one class of stock.
2. **Obtain an EIN** — Apply for a federal EIN if the entity does not already have one (free at IRS.gov, generally issued immediately).
3. **Get unanimous shareholder consent** — All shareholders on the date of election must consent in writing. Their signatures appear on Form 2553 itself.
4. **File IRS Form 2553** _(By March 15 (for calendar-year entities))_ — File Form 2553 (Election by a Small Business Corporation) by the 15th day of the 3rd month of the tax year you want the election to take effect (March 15 for calendar-year entities). Late elections may be granted under Rev. Proc. 2013-30 with a reasonable-cause statement.
5. **Set reasonable owner compensation** — Establish W-2 payroll for owner-employees at IRS “reasonable compensation” levels before taking distributions. Document the basis for the wage decision.
6. **File Form 1120-S annually** _(Each tax year)_ — Each year, file IRS Form 1120-S and issue Schedule K-1 to every shareholder, who reports their share of income, losses, and credits on their personal return.

## Frequently asked questions

### Should I elect S-corp status for my LLC?

It depends on your income, payroll obligations, state taxes, and growth plans. The S-election can save self-employment tax above a certain income, but adds payroll administration. Run the numbers with your CPA before electing.

## Sources

1. [S Corporations — IRS](https://www.irs.gov/businesses/small-businesses-self-employed/s-corporations) — Internal Revenue Service (IRS). Cited for: Eligibility and election rules.
2. [About Form 2553, Election by a Small Business Corporation](https://www.irs.gov/forms-pubs/about-form-2553) — Internal Revenue Service (IRS). Cited for: Authoritative election form.

## Related terms

- [Business entity](https://olomon.com/financial-glossary/business-entity)
- [Pass-through entity](https://olomon.com/financial-glossary/pass-through-entity)
- [EIN (Employer Identification Number)](https://olomon.com/financial-glossary/ein-employer-identification-number)

## Cite this page

Olomon Editorial Team. (2026). S-corporation. Olomon Financial Glossary. https://olomon.com/financial-glossary/s-corporation

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