Tax Brackets, Rates and Standard Deductions in Connecticut

Connecticut related income tax information, resources, forms and links. You can prepare and e-File your 2021 Connecticut Income Taxes here on eFile.com together with your Federal Income Tax Return. Information on how to only file a Connecticut Income Return. Per IRS/State regulation, you can only eFile a Connecticut return in conjunction with the IRS return as the IRS and Connecticut share data. You can only prepare a Connecticut return on eFile.com, however the return will have to be downloaded and mailed in.

Find Connecticut income tax forms, tax brackets and rates by tax year.

If you still need to file a return for a previous tax year, find the Connecticut tax forms below. You can complete and sign the forms here on eFile.com before you mail them to the CT Tax Agency. For Federal or IRS back taxes access the tax forms here.

Below find links to other important Connecticut income tax return information and other related features (e.g. tax extension, amendment, etc.)

Connecticut Income Tax Returns

Connecticut Income Taxes
Prepare only a CT State Return without an IRS return. Details
Step by Step instructions on how to only Prepare and Download - not eFile - State Returns on eFile.com.
File a 2021 Connecticut Tax Amendment
Connecticut Income Tax Forms
Connecticut Tax Brackets, Rates explained
IRS Tax Brackets, Rates by Tax Year
Calculate and Estimate your IRS Income Tax Brackets and Rates with the eFile RATEucator.

Income Tax Brackets, Rates, Income Ranges, and Estimated Taxes Due

Here you can find how your Connecticut based income is taxed at different rates within the given tax brackets. When you prepare your return on eFile.com this is all calculated for you based on your income.

Connecticut Tax Brackets for Tax Year 2021

As shown below Connecticut Tax Rates did not increase for Tax Year 2021.

Tax Rate
Filing Status
Income Range
Taxes Due
3.00%
Single or MFS
$0 - $10,000
3.00% of Income
HOH
$0 - $16,000
3.00% of Income
MFJ
$0 - $20,000
3.00% of Income
5.00%
Single or MFS
$10,000 - $50,000
$300 + 5.00%
HOH
$16,000 - $80,000
$480 + 5.00%
MFJ
$20,000 - $100,000
$600 + 5.00%
5.5%
Single or MFS
$50,000 - $100,000
$2,300 + 5.5%
HOH
$80,000 - $160,000
$3,680 + 5.5%
MFJ
$100,000 - $200,000
$4,600 + 5.5%
6.0%
Single or MFS
$100,000 - $200,000
$5,050 + 6.0%
HOH
$160,000 - $320,000
$8,080 + 6.0%
MFJ
$200,000 - $400,000
$10,100 + 6.0%
6.5%
Single or MFS
$200,000 - $250,000
$11,050 + 6.5%
HOH
$320,000 - $400,000
$17,680 + 6.5%
MFJ
$400,000 - $500,000
$22,100 + 6.5%
6.9%
Single or MFS
$250,000 - $500,000
$14,300 + 6.9%
HOH
$400,000 - $800,000
$22,880 + 6.9%
MFJ
$500,000 - $1,000,000
$28,600 + 6.9%
6.99%
Single or MFS
$500,000 - or more
$31,550 + 6.99% over $500,000
HOH
$800,000 - or more
$50,480 + 6.99% over $800,000
MFJ
$1,000,000 - or more
$63,100 + 6.99% over $1,000,000

Connecticut Tax Brackets for Tax Year 2020

Tax Rate
Filing Status
Income Range
Taxes Due
3.00%
Single or MFS
$0 - $10,000
3.00% of Income
HOH
$0 - $16,000
3.00% of Income
MFJ
$0 - $20,000
3.00% of Income
5.00%
Single or MFS
$10,000 - $50,000
$300 + 5.00%
HOH
$16,000 - $80,000
$480 + 5.00%
MFJ
$20,000 - $100,000
$600 + 5.00%
5.5%
Single or MFS
$50,000 - $100,000
$2,300 + 5.5%
HOH
$80,000 - $160,000
$3,680 + 5.5%
MFJ
$100,000 - $200,000
$4,600 + 5.5%
6.0%
Single or MFS
$100,000 - $200,000
$5,050 + 6.0%
HOH
$160,000 - $320,000
$8,080 + 6.0%
MFJ
$200,000 - $400,000
$10,100 + 6.0%
6.5%
Single or MFS
$200,000 - $250,000
$11,050 + 6.5%
HOH
$320,000 - $400,000
$17,680 + 6.5%
MFJ
$400,000 - $500,000
$22,100 + 6.5%
6.9%
Single or MFS
$250,000 - $500,000
$14,300 + 6.9%
HOH
$400,000 - $800,000
$22,880 + 6.9%
MFJ
$500,000 - $1,000,000
$28,600 + 6.9%
6.99%
Single or MFS
$500,000 - or more
$31,550 + 6.99% over $500,000
HOH
$800,000 - or more
$50,480 + 6.99% over $800,000
MFJ
$1,000,000 - or more
$63,100 + 6.99% over $1,000,000

2021 Connecticut Standard Deductions

Connecticut does not have a standard deduction.

Connecticut Income Tax Forms

Connecticut State Income Tax Forms for Tax Year 2021 (Jan. 1 - Dec. 31, 2021) can be e-Filed in conjunction with a IRS Income Tax Return. Details on how to only prepare and print a Connecticut 2021 Tax Return.

Below are forms for prior Tax Years starting with 2020. These back taxes forms can not longer be e-Filed. You can complete the forms with the help of eFile.com free tax calculators. Complete the respective Form(s) below, sign, and mail them to the Connecticut Tax Agency. In addition to filing Connecticut Forms you might also have to file previous IRS Tax Return Forms.

In addition to filing Connecticut Forms, you might also have to file previous IRS Tax Return Forms. If you can not find the form listed there, use the search button below.

Search Tax Forms

 

Form Number, Description
Year
Status

A list of income tax forms for other states.

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