Entrepreneurs in Indiana: taxes and retirement for 2026
For solo founders and small-business owners in Indiana. Indiana has a flat 2.95% state income tax for 2026. Here are the 2026 rules, a worked example and the official sources.
Indiana rules for entrepreneurs
- State income tax (2026)
- Indiana has a flat 2.95% state income tax for 2026. The state rate is scheduled to drop to 2.90% in 2027. Every county also levies a local income tax. Under Departmental Notice #1 (effective Oct. 1, 2026), county rates run from 0.5% (Porter) to 3.0% (Randolph): https://www.in.gov/dor/files/dn01.pdf
- State estimated tax
- Generally required if you owe $1,000 or more in combined state and county income tax for the year that withholding doesn't cover. Same dates as federal (April 15, June 15, September 15, and January 15 of the next year). Form ES-40.
- Marketplace contractor law (IC 22-1-6-3)
- App-based marketplace contractors are treated as independent contractors under all state and local law if nearly all pay is based on services or output and a written contract says they are independent contractors. The contract must also let them set their own hours, work for others without restriction, and bear their own expenses.
- Workers' compensation exemption certificate (Form WCE-1)
- Independent contractors who aren't required to carry workers' compensation can get an exemption certificate through Indiana DOR. The application fee is $20, and all Indiana tax returns must be filed and any delinquencies paid.
Federal rules for 2026
Entity choice changes your taxes
A single-member LLC is taxed like a sole proprietorship unless it elects S-corp status. The S-corp can lower payroll tax but adds payroll, a separate return and a reasonable-salary requirement.
Retirement as a tax lever
With no employees, a Solo 401(k) allows up to $72,000 in 2026. With employees, a SEP IRA or a 401(k) must generally cover eligible staff too.
Quarterly estimated taxes
No one withholds tax from self-employment income, so you generally pay estimates four times a year if you expect to owe $1,000 or more. For 2026 income the federal dates are April 15, June 15 and September 15, 2026, and January 15, 2027. Paying 100% of last year's tax (110% if your AGI was over $150,000) in four equal installments avoids the underpayment penalty.
Self-employment tax
On top of income tax, self-employed people pay 15.3% on 92.35% of net profit: 12.4% Social Security up to the 2026 wage base of $184,500, plus 2.9% Medicare with no cap. Half of it is deductible.
A worked example
| Self-employment tax as a sole proprietor | $28,234 |
|---|---|
| Solo 401(k) maximum as a sole proprietor | $61,677 |
| Payroll tax saved as an S-corp on a $100,000 salary | $12,934 |
| Solo 401(k) maximum as that S-corp | $49,500 |
Federal figures only. S-corps add running costs (payroll, an 1120-S return, state fees) not shown here. Computed from 2026 IRS limits (Notice 2025-67, Rev. Proc. 2025-32) and the SSA wage base.
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Questions
Do entrepreneurs in Indiana pay state income tax?
Indiana has a flat 2.95% state income tax for 2026. The state rate is scheduled to drop to 2.90% in 2027. Every county also levies a local income tax. Under Departmental Notice #1 (effective Oct. 1, 2026), county rates run from 0.5% (Porter) to 3.0% (Randolph): https://www.in.gov/dor/files/dn01.pdf
When are Indiana estimated tax payments due for 2026?
Generally required if you owe $1,000 or more in combined state and county income tax for the year that withholding doesn't cover. Same dates as federal (April 15, June 15, September 15, and January 15 of the next year). The state form is ES-40.
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Sources
- www.in.gov/dor/resources/tax-rates-and-reports/rates-fees-and-penalties/
- www.in.gov/dor/i-need-to/make-a-payment/estimated-payments/
- www.dol.gov/agencies/whd/state/minimum-wage/tipped
- iga.in.gov/ic/2025/Title_22.html
- www.in.gov/dor/i-am-a/business-corp/contractors/workers-comp/
State and local facts researched from official sources and independently re-checked; last verified October 2026, next scheduled review 2027-01-02. Educational information for 2026, not tax, legal or investment advice. Rules change; check the official sources listed and a tax professional for your situation. Gigaverse AI, Inc. is a financial technology company, not a bank, and not itself a registered investment adviser or broker-dealer.