RUV CalculatorConnecticut Income Tax Calculator 2026https://calc.ruvlabs.com/c/federal-income-tax/connecticut
Connecticut Income Tax Calculator 2026
Federal and state, added up
Income tax
Tax
State income tax
Refund Or Owed
Effective Rate
Advanced options
Breakdown
State applied
Taxable Income
Deduction Used
Marginal Rate
State schedule year
Combined marginal rate
After Tax Income
The standard deduction was used — itemising would come out smaller.
Federal plus Connecticut state comes to $13,795.00, an effective rate of 16.23%.
Connecticut income tax brackets
Connecticut has 7 brackets for single filers, from 2% on the first $10,000 of taxable income to 6.99% on income over $500,000; joint filers reach the top rate at $1,000,000. The calculator applies no Connecticut standard deduction; Connecticut's personal exemptions and credits are not modelled, so the estimate can run a little high.
These rates have been unchanged since 2024. It was checked on 2026-09-30 against CT DRS Form CT-1040ES (Rev. 01/26) Table B - Initial Tax Calculation for 2026.
Connecticut tax rate schedule (2024)
Rate
Single
Married filing jointly
Tax at the top of the single band
2%
up to $10,000
up to $20,000
$200
4.5%
$10,000 – $50,000
$20,000 – $100,000
$2,000
5.5%
$50,000 – $100,000
$100,000 – $200,000
$4,750
6%
$100,000 – $200,000
$200,000 – $400,000
$10,750
6.5%
$200,000 – $250,000
$400,000 – $500,000
$14,000
6.9%
$250,000 – $500,000
$500,000 – $1,000,000
$31,250
6.99%
over $500,000
over $1,000,000
—
Connecticut and federal income tax by income
At the calculator's default $85,000, Connecticut takes $3,925 of a $13,795 total income tax bill, or 28%. Filing status matters too: a married couple filing jointly on $170,000 owes Connecticut $7,850 — exactly what two single filers earning $85,000 each would pay.
Single filer, standard deductions only
Gross income
Connecticut tax
Connecticut rate
Federal tax
Combined effective rate
$30,000
$1,100
3.67%
$1,420
8.40%
$50,000
$2,000
4.00%
$3,820
11.64%
$65,000
$2,825
4.35%
$5,620
12.99%
$85,000 (default)
$3,925
4.62%
$9,870
16.23%
$100,000
$4,750
4.75%
$13,170
17.92%
$125,000
$6,250
5.00%
$18,734
19.99%
$200,000
$10,750
5.38%
$36,734
23.74%
$300,000
$17,450
5.82%
$68,134
28.53%
$400,000
$24,350
6.09%
$103,134
31.87%
Marginal tax rate in Connecticut
The next dollar a single filer earns above $85,000 is taxed at 27.5%: 22% federal and 5.5% by Connecticut. Connecticut's share climbs to 6.99% once taxable income passes $500,000 ($1,000,000 for joint filers).
Connecticut uses 7 brackets, from 2% to 6.99% (2024 schedule). The top rate applies above $500,000 of taxable income for single filers.
How much Connecticut income tax is due on $85,000?
For a single filer, $3,925 to Connecticut and $9,870 in federal income tax — $13,795 in all, an effective rate of 16.23%. That leaves $71,205 before Social Security and Medicare.
Does Connecticut have a standard deduction?
No fixed amount the calculator applies — Connecticut's rates go straight onto income, as explained above.
How much of a $5,000 raise goes to Connecticut?
$275 for a single filer at $85,000, next to $1,100 of federal income tax — Connecticut keeps 20% of the income tax on the raise.
Where does Connecticut's top income tax bracket start?
At $500,000 of taxable income for single filers and $1,000,000 for joint filers. On a single return, tax on the income below that line comes to $31,250.
Sources
Official documents the rates and rules on this page come from.
This is a reference calculation using common tax assumptions and is not a substitute for professional advice. We accept no liability for decisions made from it — see the terms of use for details.