Tax Year 2018 Connecticut Income Tax Brackets
|Tax Bracket||Tax Rate|
|Tax Bracket||Tax Rate|
Both Connecticut's tax brackets and the associated tax rates were last changed four years prior to 2018 in 2014.
Connecticut has seven marginal tax brackets, ranging from 3% (the lowest Connecticut tax bracket) to 6.99% (the highest Connecticut tax bracket). Each marginal rate only applies to earnings within the applicable marginal tax bracket .
In Connecticut, different tax brackets are applicable to different filing types. Married couples filing their Connecticut income tax return jointly will usually have wider tax brackets than those filing separately or as an individual.
How do Connecticut tax brackets work?
Technically, you don't have just one "tax bracket" - you pay all of the Connecticut marginal tax rates from the lowest tax bracket to the tax bracket in which you earned your last dollar. For comparison purposes, however, your Connecticut tax bracket is the tax bracket in which your last earned dollar in any given tax period falls.
You can think of the bracketed income tax as a flat amount for all of the money you earned up to your highest tax bracket, plus a marginal percentage of any amount you earned over that. The chart below breaks down the Connecticut tax brackets using this model:
|For earnings between $0.00 and $10,000.00, you'll pay 3%|
|For earnings between $10,000.00 and $50,000.00, you'll pay 5% plus $300.00|
|For earnings between $50,000.00 and $100,000.00, you'll pay 5.5% plus $2,300.00|
|For earnings between $100,000.00 and $200,000.00, you'll pay 6% plus $5,050.00|
|For earnings between $200,000.00 and $250,000.00, you'll pay 6.5% plus $11,050.00|
|For earnings between $250,000.00 and $500,000.00, you'll pay 6.9% plus $14,300.00|
|For earnings over $500,000.00, you'll pay 6.99% plus $31,550.00|
|For earnings between $0.00 and $20,000.00, you'll pay 3%|
|For earnings between $20,000.00 and $100,000.00, you'll pay 5% plus $600.00|
|For earnings between $100,000.00 and $200,000.00, you'll pay 5.5% plus $4,600.00|
|For earnings between $200,000.00 and $400,000.00, you'll pay 6% plus $10,100.00|
|For earnings between $400,000.00 and $500,000.00, you'll pay 6.5% plus $22,100.00|
|For earnings between $500,000.00 and $1,000,000.00, you'll pay 6.9% plus $28,600.00|
|For earnings over $1,000,000.00, you'll pay 6.99% plus $63,100.00|
Connecticut Income Tax Calculator
Connecticut Income Tax Estimator
You can use the income tax estimator to the left to calculate your approximate Connecticut and Federal income tax based on the most recent tax brackets.
Keep in mind that this estimator assumes all income is from wages, assumes the standard deduction, and does not account for tax credits.
For a more detailed estimate that takes these factors into account, click "View Detailed Estimate" (this will will redirect to an external website).
Connecticut Tax Deductions
When calculating your Connecticut income tax, keep in mind that the Connecticut state income tax brackets are only applied to your adjusted gross income (AGI) after you have made any qualifying deductions.
Qualifying deductions might include an itemized deduction, the Connecticut standard deduction, exemptions for dependants, business expenses, etc.
Remember that Connecticut may have very different deduction laws from the Federal Income Tax, so you may have to write a whole new list of deductions for your Connecticut income tax return.
Download .CSV file of CT income tax bracketsCompatible with Excel or database software
Download or print Connecticut income tax formsCT income tax forms are available as PDFs
Connecticut Standard Deductions & Personal Exemption Amounts
In addition to marginal tax brackets, one of the major features of the Connecticut income tax is deductions. The three most common deductions encountered by taxpayers are the Connecticut Standard Deduction, the Connecticut Personal Exemption, and the Connecticut Dependent Deduction. The current values of these deductions for tax year 2018 are as follows:
|Standard Deduction (Single)||Standard Deduction (MFJ)||Personal Exemption||Dependant Exemption|
|$0.00||$0.00||$15,000.00 *||$0.00 *|
The standard deduction, which Connecticut does not have, is a deduction that is available by default to all taxpayers who do not instead choose to file an itemized deduction.
The Personal Exemption, which is supported by the Connecticut income tax, is an additional deduction you can take if you (and not someone else) are primarily responsible for your own living expenses. Likewise, you can take an additional dependent exemption for each qualifying dependent (like a child or family member), who you financially support.
The Federal income tax also has a standard deduction, personal exemptions, and dependant deductions, though they are different amounts than Connecticut's and may have different rules.
Head over to the Federal income tax brackets page to learn about the Federal Income Tax, which applies in all states nationwide.
Sources & Citations
Disclaimer: While we do our best to keep this list of Connecticut income tax rates up to date and complete, we cannot be held liable for errors or omissions. Is info on this page missing or out-of-date? Please let us know so we can fix it!
The Connecticut tax brackets on this page have been updated for tax year 2018, and are the latest brackets available. States often adjust their tax brackets on a yearly basis, so make sure to check back later for Connecticut's updated tax year 2019 tax brackets!