Connecticut State Tax Guide for Businesses & Individuals 2026
Connecticut operates one of the most comprehensive state tax systems in the Northeast, featuring a graduated individual income tax, a uniform statewide sales tax with no local additions, and robust employer payroll obligations including Paid Family and Medical Leave. Whether you are a business owner, corporate filer, or Connecticut resident, understanding your full tax obligations is essential for compliance and financial planning in 2026. For a complete overview of US state tax requirements, visit our US Tax Compliance resource.
Quick Reference: Connecticut Tax Rates at a Glance
| Tax Type | Rate / Detail |
|---|
| State Corporate Income Tax | 7.5% flat rate on Connecticut net income |
| State Individual Income Tax | 3.0% – 6.99% (graduated brackets) |
| State Sales Tax Base Rate | 6.35% |
| Average Combined Sales Tax | 6.35% (no local sales tax in Connecticut) |
| Unemployment Insurance (SUI/SUTA) | 1.9% – 6.8%; New employer: 3.0% |
| Effective Property Tax Rate | ~1.79% (avg. effective rate) |
| Estate / Inheritance Tax | Yes — Connecticut estate tax applies above $13.61 million (2026) |
Connecticut Business Tax Nexus
What is Tax Nexus in Connecticut?
Tax nexus in Connecticut refers to the legally sufficient connection between a business and the state that triggers tax registration and filing obligations. Nexus can be established through physical presence within Connecticut or through economic activity that meets defined thresholds.
Physical Nexus
- Maintaining a physical office, store, warehouse, or other business facility in Connecticut
- Having employees, agents, or independent sales representatives working in Connecticut
- Storing inventory or goods in a Connecticut-based fulfillment center, including Amazon FBA warehouses
- Operating company-owned or leased vehicles regularly within Connecticut
- Owning, leasing, or using tangible or real property located in Connecticut
Economic Nexus (Remote Sellers)
| Threshold Type | Requirement |
|---|
| Sales Threshold | $100,000 in gross receipts from Connecticut sales |
| Transaction Count Threshold | 200 or more separate transactions into Connecticut |
| Effective Date | December 1, 2018 |
Click-Through & Affiliate Nexus
Connecticut enforces both click-through and affiliate nexus rules. A remote retailer establishes nexus when a Connecticut-based resident refers customers through a website link or promotional agreement and the seller's gross receipts from those referrals exceed $2,000 in the prior 12 months.
Connecticut State Income Tax
Corporate Income Tax
| Detail | Information |
|---|
| Corporate Tax Rate | 7.5% flat rate on Connecticut net income |
| Surcharge | 10% surcharge applies to corporations with more than $100 million in gross income |
| Apportionment Formula | Single sales factor (market-based sourcing) |
| Combined/Unitary Reporting | Combined unitary reporting required for affiliated groups |
| Minimum Tax | $250 minimum business entity tax for most corporations |
Individual Income Tax
| Connecticut Taxable Income (Single) | Connecticut Taxable Income (Married Filing Jointly) | Tax Rate |
|---|
| $0 – $10,000 | $0 – $20,000 | 3.0% |
| $10,001 – $50,000 | $20,001 – $100,000 | 5.0% |
| $50,001 – $100,000 | $100,001 – $200,000 | 5.5% |
| $100,001 – $200,000 | $200,001 – $400,000 | 6.0% |
| $200,001 – $250,000 | $400,001 – $500,000 | 6.5% |
| $250,001 – $500,000 | $500,001 – $1,000,000 | 6.9% |
| Over $500,000 | Over $1,000,000 | 6.99% |
| Deduction / Exemption | Amount |
|---|
| Standard Deduction | Connecticut does not provide a state standard deduction |
| Personal Exemption (Single) | $15,000 |
| Personal Exemption (Married Filing Jointly) | $24,000 |
| Federal Tax Code Conformity | Rolling conformity — Connecticut conforms to the IRC as currently in effect with specific state-level modifications |
Filing Deadlines
| Filing Type | Due Date |
|---|
| Corporate Return (Form CT-1120) | 15th day of the month following the federal corporate return due date |
| Individual Return (Form CT-1040) | April 15, 2026 |
| Extension Period | 6 months automatic; individual return extended to October 15, 2026 |
| Estimated Payment Q1 | April 15, 2026 |
| Estimated Payment Q2 | June 15, 2026 |
| Estimated Payment Q3 | September 15, 2026 |
| Estimated Payment Q4 | January 15, 2027 |
Connecticut Sales Tax
State Sales Tax Rate
Connecticut imposes a uniform statewide sales tax rate of 6.35% with no additional local sales taxes. This makes Connecticut one of the few states with a single, consistent sales tax rate across all jurisdictions, significantly simplifying compliance for both in-state businesses and remote sellers serving Connecticut customers.
Taxable vs. Exempt Goods & Services
| Category | Status | Notes |
|---|
| Tangible Personal Property | ✅ Taxable | All tangible goods are subject to Connecticut sales tax unless a specific exemption applies |
| SaaS / Digital Products | ✅ Taxable | Connecticut taxes digital goods, downloaded software, and SaaS products delivered to Connecticut customers |
| Groceries / Food | ❌ Exempt | Unprepared food items purchased for home consumption are exempt; restaurant meals and prepared food are taxable |
| Prescription Drugs | ❌ Exempt | Prescription medications and qualifying medical equipment are fully exempt from Connecticut sales tax |
| Clothing | ⚠️ Partial | Clothing items costing less than $50 per item are exempt; items priced at $50 or more per item are fully taxable |
| Manufacturing Equipment | ❌ Exempt | Machinery and equipment used directly and predominantly in a qualifying manufacturing process are exempt |
| Professional Services | ⚠️ Partial | Most professional services are exempt; certain services including computer and data processing are taxable at a reduced 1% rate |
Sales Tax Permits & Registration
- Registering Agency: Connecticut Department of Revenue Services — www.ct.gov/drs
- Cost to Register: $100 one-time permit fee
- Renewal Requirement: Sales tax permit does not expire; no periodic renewal is required
Filing Frequency & Deadlines
| Annual Tax Liability | Filing Frequency | Due Date |
|---|
| Less than $1,000 | Annual | January 31 of the following year |
| $1,000 – $4,999 | Quarterly | Last day of the month following the quarter end |
| $5,000 – $29,999 | Monthly | Last day of the following month |
| $30,000 or more | Monthly with prepayment | Prepayment due by the 20th; return due the last day of the following month |
Local Sales Tax Rates (Top Cities)
| Jurisdiction | Local Rate | Combined Rate |
|---|
| Hartford | 0.00% | 6.35% |
| Bridgeport | 0.00% | 6.35% |
| New Haven | 0.00% | 6.35% |
| Stamford | 0.00% | 6.35% |
| Waterbury | 0.00% | 6.35% |
Connecticut Payroll Tax & Compliance
Employer Payroll Tax Obligations
| Tax / Program | Rate / Detail |
|---|
| State Income Tax Withholding | 3.0% – 6.99% graduated rates; withholding tables provided by DRS annually |
| SUI/SUTA Rate Range | 1.9% – 6.8% (employer paid) |
| SUI Taxable Wage Base | $25,000 per employee per year (2026) |
| New Employer SUI Rate | 3.0% for most new Connecticut employers |
| Workers' Compensation | Private insurance required; Connecticut Second Injury Fund available for qualifying claims |
| Paid Family & Medical Leave (PFMLA) | 0.5% of employee gross wages; employee-paid contribution only |
| State Disability Insurance | Not applicable — no separate Connecticut SDI program |
Withholding Registration & Filing
- Registration Agency: Connecticut Department of Revenue Services — www.ct.gov/drs
- Filing Frequency: Weekly, monthly, or quarterly based on total annual withholding liability thresholds
- Annual Reconciliation Deadline: January 31 — Form CT-W3 submitted with W-2s electronically to the DRS
- New Hire Reporting Deadline: Within 20 days of hire to the Connecticut Department of Labor
Minimum Wage
| Category | Rate |
|---|
| Standard Minimum Wage | $16.35/hour (effective January 1, 2026) |
| Tipped Employee Rate | $8.23/hour for hotel and restaurant employees |
| Youth / Training Wage | $12.26/hour for employees under age 18 during the first 90 days of employment |
| Next Scheduled Increase | Indexed to the employment cost index; adjusted automatically each January 1 |
Connecticut Property Tax
- Assessment Ratio: 70% of fair market value across all property classes
- Effective Average Rate: ~1.79% of fair market value statewide
- Assessment Cycle: Revaluation required every 5 years; municipalities may revalue more frequently at their discretion
- Appeal Deadline: February 20 — appeal must be filed to the local Board of Assessment Appeals within 90 days of the October 1 assessment date
Business Personal Property Tax
- Applicability: Yes — Connecticut municipalities assess business personal property including equipment, furniture, computers, and machinery
- Form Name: Personal Property Declaration (Form M-65 or applicable municipal equivalent)
- Filing Deadline: November 1 of each assessment year
- Exemption Threshold: Business personal property with a total assessed value of $1,500 or less is fully exempt
Homestead & Other Exemptions
| Exemption Type | Amount / Rate | Eligibility |
|---|
| Elderly / Disabled Tax Relief | Up to $1,250 reduction in annual property tax liability (circuit breaker program) | Age 65 or older, or totally disabled; income limits apply per program guidelines |
| Veteran Exemption | $1,000 reduction in assessed value; up to $3,000 for wartime veterans | Honorably discharged Connecticut veterans or surviving spouse of a qualified veteran |
| Disabled Veteran Exemption | Up to $10,000 reduction in assessed value | Veterans with a service-connected disability rating certified by the VA |
| Agricultural Land | Assessed at preferential use value rather than full fair market value | Actively farmed land that meets Connecticut's statutory farming classification requirements |
Property Tax Due Dates
| Installment | Due Date | Notes |
|---|
| First Installment | July 1 (grace period to August 1) | Covers the first half of the full annual property tax bill |
| Second Installment | January 1 (grace period to February 1) | Covers the second half of the full annual property tax bill |
| Early Payment Discount | Not available statewide | No state-mandated early payment discount; discount availability varies by municipality |
Other Key Connecticut Taxes
Franchise / Privilege Tax
Connecticut does not impose a standalone franchise tax based on net worth or capital. All corporations doing business in Connecticut are subject to a biennial Business Entity Tax of $250. The standard corporate income tax at 7.5% applies to Connecticut net income, with an additional 10% surcharge imposed on corporations with gross income exceeding $100 million.
Gross Receipts Tax
Connecticut does not impose a general statewide gross receipts tax on businesses. Corporate income is taxed under the standard corporate income tax framework. Certain regulated industries including utilities and petroleum products distributors may be subject to sector-specific gross receipts assessments administered by the DRS.
Excise Taxes
| Product | Rate |
|---|
| Gasoline | $0.25 per gallon |
| Diesel | $0.49 per gallon |
| Cigarettes | $4.35 per pack (20 cigarettes) |
| Beer | $0.24 per gallon |
| Wine | $0.72 per gallon |
| Cannabis | 3% – 6% cannabis tax based on THC content; standard 6.35% sales tax also applies |
Connecticut Tax Credits & Incentives
| Credit / Incentive | Value / Rate | Eligibility |
|---|
| Research & Development Tax Credit | 6% – 24% of qualifying Connecticut R&D expenditures | Businesses conducting qualified research activities within Connecticut against corporate income tax liability |
| Job Expansion Tax Credit | Up to $900 per net new full-time Connecticut employee per year for up to 5 years | Businesses creating net new jobs in Connecticut meeting applicable wage and benefit requirements |
| Angel Investor Tax Credit | 25% – 40% of qualifying investment in Connecticut-based start-up companies | Accredited investors funding eligible early-stage Connecticut companies through approved programs |
| Historic Preservation Tax Credit | 25% – 30% of qualified rehabilitation expenditures on certified historic structures | Property owners completing approved rehabilitation of state or nationally certified historic buildings |
| Insurance Reinvestment Tax Credit | Up to 100% offset of insurance premium tax liability | Insurance companies making qualifying investments in Connecticut affordable housing or community development |
| Film Production Tax Credit | 10% – 30% of qualified Connecticut production expenditures | Film, television, and digital media productions meeting minimum spend thresholds in Connecticut |
| Manufacturing Apprenticeship Tax Credit | $4,800 per registered apprentice per year | Connecticut manufacturers sponsoring registered apprenticeship programs in approved manufacturing trades |
How to Register a Business in Connecticut
- Choose Your Business Structure: Determine whether an LLC, Corporation, Partnership, or Sole Proprietorship aligns with your liability, taxation, and operational goals.
- Register with the Connecticut Secretary of State: File a Certificate of Organization (LLC) or Certificate of Incorporation (Corporation) at www.ct.gov/sots. LLC filing fee: $120; Corporation filing fee: $250.
- Obtain a Federal EIN: Apply for an Employer Identification Number through the IRS at www.irs.gov — free of charge and processed immediately online.
- Register for State Tax Accounts: Register for Connecticut sales tax, income tax withholding, and corporate income tax through the Department of Revenue Services at www.ct.gov/drs.
- Register for Unemployment Insurance: Open a Connecticut SUI employer account with the Department of Labor at www.ct.gov/dol.
- Register for PFMLA: Enroll with the Connecticut Paid Leave Authority at www.ctpaidleave.org and begin withholding required employee contributions.
- Obtain Required Licenses and Permits: Review applicable industry-specific licensing through Connecticut's eLicense portal and obtain all required local business permits from your municipality.
Key Connecticut Tax Agencies & Resources
| Agency | Responsibility | Website |
|---|
| Connecticut Department of Revenue Services (DRS) | Income tax, sales tax, withholding, excise taxes, business entity tax, tax registration | www.ct.gov/drs |
| Connecticut Department of Labor (CTDOL) | Unemployment insurance, wage enforcement, new hire reporting, workforce programs | www.ct.gov/dol |
| Connecticut Secretary of State (SOTS) | Business entity registration, annual report filing, commercial recordings | www.ct.gov/sots |
| Connecticut Paid Leave Authority | PFMLA program administration, employer registration, employee leave claims processing | www.ctpaidleave.org |
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Note: This guide is for informational purposes only and does not constitute legal or tax advice. Consult a licensed tax professional for advice specific to your situation.
