How to Start an S Corp in Indiana (and When an LLC Should Elect)
How to Start an S Corp in Indiana (and When an LLC Should Elect)
An S corporation is not a separate type of company under Indiana law. It is a federal tax election, made on IRS Form 2553, that tells the IRS to tax a corporation or eligible LLC as a pass-through entity. You still have to form the business first as an Indiana corporation or Indiana LLC with the Secretary of State. The state filing creates the legal entity. The S election changes how the income is taxed.
Informational only, not legal or tax advice. This article describes general processes and Indiana figures verified from official sources on the research date. S elections and pass-through tax decisions depend on your facts, so have a CPA, and an Indiana business attorney where needed, review your plan before you file or rely on any number here.
S corp vs. LLC taxed as an S corp
Indiana gives you two routes to the same federal tax result:
- Indiana corporation with an S election. File Articles of Incorporation, Domestic Corporation (State Form 4159), then file Form 2553 with the IRS. The corporation is the legal entity, and the election only changes federal tax treatment.
- Indiana LLC with an S election. File Articles of Organization, Domestic Limited Liability Company (State Form 49459), then file Form 2553 so the LLC is taxed as a corporation with S status. Your operating agreement still governs internal rules.
Both formation filings cost $95 online through INBiz, or $100 on paper.
What you need before you start
- A name that is distinguishable on the Secretary of State's records. Check the Indiana Business Search first.
- An Indiana street address for the registered office, and a registered agent.
- Legal names, addresses, and ownership percentages for every initial owner. S status limits shareholders to individuals who are U.S. citizens or residents, plus certain trusts and estates. Partnerships, corporations, and nonresident aliens cannot hold S stock.
- A federal Employer Identification Number (EIN) from the IRS.
- Bylaws (corporation) or an operating agreement (LLC), plus a stock or membership ledger.
- A business bank account, and a budget that covers the $95 filing fee and the $32 Business Entity Report due every other year.
Step-by-step: forming an Indiana S corp or S-election LLC
Choose the entity and confirm the S limits fit. S corporations allow up to 100 shareholders and only one class of stock. These limits matter most if you expect outside investors, preferred stock, or partnership owners. Changing entity type later costs more than choosing carefully now.
Reserve the name if you need time. INBiz takes a $10 name reservation that holds the name for 120 days. It does not form the business, so you still file the formation document. Start at the INBiz start page.
File the formation document and name a registered agent. File State Form 4159 or 49459 through INBiz for $95. Every entity must continuously maintain a registered agent and registered office in Indiana. The registered office must be a street address, since a P.O. Box is not enough unless it comes with a rural route reference. The business cannot be its own agent, and an entity may have only one. Indiana publishes no formation processing time, and INBiz lists no expedited option for a domestic LLC, so confirm current timing before you set an opening date.
Get your EIN. Apply to the IRS after the state approves the entity, so the legal name matches. You need the EIN for the bank account, payroll, and Form 2553.
Adopt governing documents and issue ownership. Adopt bylaws or an operating agreement, document the first meeting or written consent, and issue ownership in the agreed percentages. Review buy-sell and shareholder agreements carefully. Different rights to distributions or liquidation proceeds can create a second class of stock, which can put the S election at risk.
File Form 2553 with the IRS. Every shareholder must sign the consent. Confirm the deadline in the Form 2553 instructions or with your CPA, because it is tied to the tax year the election covers. Do not treat the election as in place until you have confirmation from the IRS or your CPA has verified the filing.
Set up payroll and reasonable pay. Owners who work in the business generally must receive reasonable W-2 wages before taking distributions. Document how you set the salary. If you have employees, confirm withholding registration requirements with the Department of Revenue.
Set up your Indiana income tax filings. An Indiana S corporation files Form IT-20S. Whether and how Indiana conforms to the federal S election was not confirmed from a Department of Revenue page during this research, so confirm that treatment with the Department before you file. Decide each year whether to elect PTET.
Calendar the Business Entity Report. File it every other year for $32 online, or $50 on paper. The first report is due two years after formation, by the end of the month in which the business was formed.
Indiana taxes on an S corp
| Tax | How it applies |
|---|---|
| Franchise tax | None. Indiana has no franchise tax. |
| Individual adjusted gross income tax | Flat 2.95% for 2026, scheduled to fall to 2.90% for 2027. Shareholders pay it on their share of income. |
| County local income tax | Set by the county of residence on January 1. Department of Revenue Departmental Notice 1 lists 2026 rates from 0.50% in Porter County to 3.00% in Randolph County. Confirm your county rate. |
| Corporate adjusted gross income tax | 4.9% flat, unchanged since July 1, 2021. Whether an S election keeps an entity outside this rate was not confirmed, so confirm with the Department of Revenue. |
Pass-through entity tax (PTET): the annual election
PTET is an optional tax the entity can pay on its income instead of shareholders paying it individually. Key rules:
- You must elect it every year. An election does not carry over.
- Eligible entities include partnerships, S corporations, and LLCs taxed as either. C corporations, trusts, sole proprietorships, and single-member disregarded LLCs are not eligible.
- The rate equals the individual rate for the tax year. The Department of Revenue lists 3.23% for 2022, 3.15% for 2023, 3.05% for 2024, and 3.00% for 2025. The 2.95% rate for 2026 and 2.90% for 2027 match the individual schedule.
- For 2023 and later, check the PTET box on page 1 of the IT-20S (or IT-65 for partnerships) and complete Schedule PTET, codes 01 to 06, on a timely filed return, including extensions. You cannot elect by amending after the original return is filed, according to the Department of Revenue PTET FAQ.
- For calendar-year filers, estimated payments are reported as due April 20, June 20, September 20, and December 20. Confirm these dates on the Department of Revenue PTET page.
Owners look at PTET because it can change how state tax on business income is paid, which may interact with federal limits on individual state tax deductions. Whether it helps depends on your income, your county rate, and your federal return, so have a CPA model the comparison before the election deadline.
When an LLC should elect S status (and when it should not)
A single-owner LLC is taxed as a disregarded entity by default, and a multi-member LLC is taxed as a partnership. Either can file Form 2553 to be taxed with S status. An election may make sense when:
- Profit is well above the reasonable salary you would pay yourself, so distributions are meaningful.
- You already run payroll, or can support its added cost and bookkeeping.
Staying with default LLC treatment often fits better when profit is modest, when you want a flexible operating agreement, or when you expect investors who need different distribution rights or who are partnerships, corporations, or nonresident aliens. Those owners cannot hold S stock. A switch changes federal treatment only. The LLC still files its Indiana Business Entity Report and keeps its registered agent.
Common mistakes to avoid
- Assuming Indiana creates an S corp. You form a corporation or LLC. S status is a federal election on Form 2553.
- Missing a shareholder signature on Form 2553. Every shareholder must sign, so collect signatures before filing.
- Paying yourself nothing. Owners who work in the business generally need reasonable wages before distributions.
- Using a P.O. Box as the registered office. Indiana requires a street address.
- Assuming a small change makes a name distinguishable. Inc., LLC, punctuation, capitalization, and the word the do not count. Choose a different core word.
- Treating county tax as statewide. Shareholders pay the rate of the county where they lived on January 1.
- Assuming Indiana follows the federal election. Confirm the treatment with the Department of Revenue before filing the IT-20S.
What to expect
Owners who complete this process usually end up with an Indiana entity in good standing, an IRS S election on record, and a yearly routine of payroll, IT-20S filing, and the biennial report. Owners often look to the S election to reduce self-employment tax on profit taken as distributions. That result is not guaranteed. It depends on profit, the salary you set, and state and county taxes, and it adds payroll and bookkeeping work. Review the election with your CPA each year.
Next steps and official resources
- Indiana Secretary of State, Business Services Division: in.gov/sos/business
- INBiz filing portal: inbiz.in.gov
- Indiana Department of Revenue: in.gov/dor
- Indiana Small Business Development Center: isbdc.org
- U.S. Small Business Administration, Indiana: sba.gov/district/indiana
Before you file Form 2553 or make your first PTET election, get a written review from a qualified CPA. If you have more than one owner, have an Indiana business attorney review the bylaws or operating agreement. This article is informational only and is not legal or tax advice.