Entrepreneurs in Connecticut: taxes and retirement for 2026
For solo founders and small-business owners in Connecticut. Connecticut has a graduated state income tax for 2026: 2% to 6.99% (top rate starts at $500,000 for single filers). Here are the 2026 rules, a worked example and the official sources.
Connecticut rules for entrepreneurs
- State income tax (2026)
- Connecticut has a graduated state income tax for 2026: 2% to 6.99% (top rate starts at $500,000 for single filers). Rates are percentages. 2026 single brackets: 2% on the first $10,000 of Connecticut taxable income, then 4.5%, 5.5%, 6%, 6.5% and 6.9%, with 6.99% on income over $500,000 (DRS IP 2026(7), 2026 tax calculation schedule). Higher earners also lose the benefit of the 2% bracket through a phase-out add-back.
- State estimated tax
- You must pay estimated tax if your Connecticut income tax after withholding and any pass-through entity tax credit will be $1,000 or more and your withholding will be less than your required annual payment. Same dates as federal: 25% each on April 15, June 15 and September 15, 2026 and January 15, 2027. Farmers and fishermen make one payment by January 15, 2027. Form CT-1040ES.
- ABC test for unemployment insurance
- For unemployment insurance, the Connecticut Department of Labor treats a worker as an employee unless all three are true: the worker is free from direction and control, the work is outside the usual course of the business or outside all its places of business, and the worker is customarily engaged in an independently established trade or business. The Department of Revenue Services uses common-law control rules for tax purposes instead.
- State retirement program
- MyCTSavings is live. It is built around W-2 employers and does not cover 1099 contractors through the employer mandate; self-employed residents can enroll on their own.
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 Connecticut pay state income tax?
Connecticut has a graduated state income tax for 2026: 2% to 6.99% (top rate starts at $500,000 for single filers). Rates are percentages. 2026 single brackets: 2% on the first $10,000 of Connecticut taxable income, then 4.5%, 5.5%, 6%, 6.5% and 6.9%, with 6.99% on income over $500,000 (DRS IP 2026(7), 2026 tax calculation schedule). Higher earners also lose the benefit of the 2% bracket through a phase-out add-back.
When are Connecticut estimated tax payments due for 2026?
You must pay estimated tax if your Connecticut income tax after withholding and any pass-through entity tax credit will be $1,000 or more and your withholding will be less than your required annual payment. Same dates as federal: 25% each on April 15, June 15 and September 15, 2026 and January 15, 2027. Farmers and fishermen make one payment by January 15, 2027. The state form is CT-1040ES.
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Sources
- portal.ct.gov/-/media/drs/publications/pubsip/2026/ip-2026-7.pdf?rev=beb6c5218aa2444ea6e213edcd465f0f&hash=3DBADA0CC8447FD1EF469E88518F8FC2
- portal.ct.gov/drs/individuals/resident-income-tax/tax-information
- portal.ct.gov/governor/news/press-releases/2025/09-2025/governor-lamont-announces-minimum-wage-will-increase
- portal.ct.gov/dol/divisions/wage-and-workplace-standards/jecfaqs
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.