Business taxes

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Simplify your business taxes

Looking for tax forms or tips on how to file business taxes in CT? Now, you can find everything you need to tackle your taxes all in one place. Filing business taxes is crucial for staying compliant. We also provide information on tax incentives, opportunity and enterprise zones, and more to help strengthen your CT business.

File and pay business taxes  
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How to file your business annual report in CT

Every year, businesses in Connecticut send annual reports to the Secretary of State. That's how we keep up to date on each company's current address, officers, directors, members, and managers.

More resources for your CT business taxes

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Corporate business tax

Find out if you're responsible for corporate business tax, and how to manage it. This information can help with corporation tax planning.
Learn more about corporate business tax  
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Employee withholding tax

Does your business have employees? Then you're required to collect income tax from their wages. Learn all you need to know about employee withholding tax.
Find out about employee withholding tax  
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Sales and use tax

If your business sells, rents, or leases goods or services, or if you operate a lodging establishment, you may need to register for sales and use tax.
Learn more about sales and use tax  

Unemployment insurance taxes

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How to file and pay

Businesses in Connecticut must pay unemployment insurance taxes. These taxes fund benefits for their employees who become unemployed. The CT Department of Labor's Unemployment Insurance Tax Division page offers clear guidance and online tools to:

  • Get your Employer Account Number (EAN).
  • File unemployment insurance tax and wage reports.
  • Pay unemployment insurance taxes online.
Learn about unemployment insurance tax  

Tax support

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The help you need for CT business tax filing

If you need some guidance on how to file your State and Federal business taxes, we’re here to help. Use the link below to file CT taxes online. Use the links that follow for general state and federal tax help.
File CT state business taxes online  

Business tax guides 

Find Federal and State business tax guides.

IRS small business tax center 

Tax help for small businesses and the self-employed.

Business credits and deductions 

Access the IRS list of business tax credits and deductions.

Tax info by business type 

Get industry-specific tax information.

CT tax incentives for businesses

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Love doing business in Connecticut

We aim to create a business-friendly culture in Connecticut. Below, you'll get access to many programs and tax incentives. They will help make your business more profitable.

Learn why so many successful businesses have chosen to call CT "home."

View all CT tax incentives  

CT tax credits

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Find out why CT is great for business

The State of Connecticut wants you to do business here! That’s why we offer a wide range of tax credits to help businesses start, grow, and thrive in our state. Learn more about the great tax incentives in CT.
Learn about tax credit programs  

Angel investor tax credit 

Learn about tax credits for angel investors.

Accumulated R&D tax 

For businesses with over $500,000 of CT R&D tax credits.

Insurance reinvestment tax credit 

Get up to 100% tax credit on premiums.

Urban industrial site reinvestment tax credit 

Tax incentives to revitalize urban or industrial sites.

CT tax exemptions

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Business is better in Connecticut

There are multiple tax exemptions available in CT to encourage businesses to operate in our state. Find out which exemptions your business could benefit from today!
See all CT business tax exemptions  

Corporate business tax exemption 

Find out which businesses qualify.

Machinery and equipment tax exemption 

See if your business is eligible.

Real and personal property tax exemptions 

For modernization and job creation.

Sales and use tax exemption 

For qualified retention or expansion efforts.

CT enterprise zones

View all enterprise zones  
Learn how operating in enterprise zones can help your Connecticut business.

Airport development zone 

Tax abatement for businesses that meet the qualifying requirements in an airport development zone.

Bioscience corridor zone 

For biotech businesses and related properties in certain census tracts in areas along Interstate 84.

Contiguous municipality zone 

For manufacturers and service companies in municipalities in close proximity to an enterprise zone.

Defense plant zone 

For municipalities impacted by a prime defense contract cutback or closure of an aerospace or defense plant.

Manufacturing plant zone 

A five-year, 80% abatement of local property taxes on qualifying real estate and personal property.

Railroad depot zone 

Encourages businesses to redevelop land or facilities around abandoned or underutilized railroad depots.
View all enterprise zones  

Federal opportunity zones in Connecticut

View all federal opportunity zones  
Learn how opportunity zones in Connecticut can benefit your business.

CT state opportunity zone enhancements 

Find out how CT backs businesses even more.

Federal opportunity zone tax benefits 

Learn more about the federal opportunity zone program in CT.

Opportunity zone resources 

Find Connecticut opportunity zone maps, webinars, and more.
View all federal opportunity zones