Connecticut Income Tax Calculator 2026
Calculate your combined federal and Connecticut state income tax for 2026. See your federal brackets, Connecticut tax, effective rate, and take-home pay — all calculated privately in your browser.
How Connecticut Income Tax Calculator Works
Calculate your Connecticut income tax (up to 6.99%) plus federal tax. See combined brackets, effective rate, and take-home pay. and. Enter your values into the form above and the calculator processes them instantly in your browser — no data is sent to any server.
Connecticut Income Tax: Graduated Brackets Up to 6.99%
Connecticut uses a progressive income tax system with 7 brackets. Rates range from 3.0% to 6.99%, with higher income taxed at higher rates. Connecticut also applies a tax on capital gains and has a personal tax credit for lower-income filers.
Like federal taxes, Connecticut's system is marginal — only the income within each bracket is taxed at that bracket's rate. Combined with federal taxes (10%–37%), Connecticut residents can face a total marginal rate of up to 43.99% on their highest dollars of income.
Connecticut Tax Brackets for 2026 (Single Filer)
The Connecticut income tax brackets for single filers are:
- 3.0% on income from $0 to $10,000
- 5.0% on income from $10,000 to $50,000
- 5.5% on income from $50,000 to $100,000
- 6.0% on income from $100,000 to $200,000
- 6.5% on income from $200,000 to $250,000
- 6.9% on income from $250,000 to $500,000
- 6.99% on income over $500,000
Your marginal rate is the rate on your last dollar of income. Your effective rate (total tax divided by total income) is always lower because of the progressive structure.
Tips to Lower Your Connecticut Tax
Maximize pre-tax retirement contributions to reduce both federal and Connecticut taxable income. The 2026 401(k) limit is $24,500 ($32,500 with catch-up for age 50+). If Connecticut conforms to federal deductions, your standard deduction and itemized expenses also reduce your state tax liability.
Tips for Getting Accurate Results
For the most accurate results, use up-to-date numbers from official sources. Double-check your inputs before calculating — small errors in the starting values can lead to significantly different outputs. If you are comparing scenarios, keep all variables the same except the one you are testing. Save or screenshot your results for future reference. This calculator uses standard formulas and is designed to give you a reliable quick estimate, though professional advice may be needed for complex situations.
Connecticut Income Tax Calculator: Pass-Through Entity Tax (PET) Credit Explained
If you receive income through a Connecticut S-corp, LLC, or partnership, the Pass-Through Entity Tax (PET) materially changes your personal Connecticut income tax owed. Per the CT DRS Pass-Through Entity Tax overview, the entity pays Connecticut tax at the 6.99% top rate on income attributable to CT, and you receive a personal credit equal to 87.5% of your share of that PET. For a $200,000 K-1 share, the entity pays $13,980 and you claim a $12,233 credit on your CT-1040 — neutralizing most of the double taxation. This is one of the few states where PET still nets a federal tax benefit (the entity-level deduction beats the $10,000 SALT cap workaround). This calculator's output is the pre-PET state liability; subtract your PET credit if you are a pass-through owner. Updated 2026-06-19.
Connecticut Income Tax Calculator: Estimated Payments for Self-Employed and Investors (2026)
If you have non-wage income — 1099, rental, capital gains, or pass-through entity distributions — Connecticut requires quarterly estimated payments via Form CT-1040ES. Use the connecticut income tax calculator above to project your full-year liability, divide by 4 for each quarter. 2026 due dates: April 15 (Q1), June 16 (Q2), September 15 (Q3), January 15, 2027 (Q4) — same as federal Form 1040-ES. CT DRS safe-harbor: pay 100% of last year's CT tax or 90% of current-year tax in equal installments to avoid the underpayment penalty. Connecticut adds a wrinkle: if your prior-year AGI was over $150,000 ($75,000 if MFS), the safe-harbor jumps to 110% of last year. Investor example: $15,000 LTCG at 6.5% CT rate = $975 CT tax → $244 per quarterly CT-1040ES voucher per the CT DRS Personal Income Tax page. Updated 2026-06-27.
Connecticut Income Tax Calculator: Worked Example for an $80,000 Salary in 2026
Walk through a CT resident scenario: $80,000 single-filer gross. The first $10,000 taxes at 3.0% = $300. The next $40,000 (10K–50K bracket) at 5.0% = $2,000. The next $30,000 (50K–80K, inside the 5.5% bracket) = $1,650. Total CT state tax = $3,950, an effective rate of 4.9%. Connecticut also offers a personal tax credit phase-out for AGI under $48,000 single. Per CT DRS Personal Income Tax 2026, the 2024 tax cut reduced the lowest two brackets (3.0% → 2.0% and 5.0% → 4.5%) for most filers — a permanent reduction worth roughly $250 on an $80K salary. Stack federal tax (~$10,852 single in 2026), FICA ($6,120), and your take-home is approximately $58,768 (73.5% retention).
Connecticut Income Tax Calculator: 2026 Retirement and Social Security Exclusion
Connecticut has phased in one of the most retiree-friendly reforms on the East Coast. Per the CT DRS Personal Income Tax page, Social Security benefits are 100% CT-tax-exempt for single filers with federal AGI under $75,000 and joint filers under $100,000, with a phase-down above those AGIs. Additionally, 100% of pension and annuity income (traditional IRA, private, and government pensions) is exempt for single filers under $75K AGI / joint under $100K AGI — completing a multi-year phase-in that started in 2019. A retired CT couple with $28,000 Social Security, $22,000 pension, and $10,000 traditional IRA withdrawal (federal AGI $60,000) owes $0 in Connecticut state income tax because SS + pension exclusions cover everything except the IRA, which is under the CT personal exemption. Above the AGI thresholds, exemptions phase out $2,500 per $5,000 of excess AGI. Run the connecticut income tax calculator with your AGI to see which zone you fall in. Updated 2026-07-04.
Income Tax Calculator Connecticut: 2026 Rate Cut — 2% and 4.5% Brackets Reduced
Connecticut cut two of its lower income tax brackets effective January 1, 2026, per CT DRS TSSN 2025-1. The lowest bracket dropped from 3.0% → 2.0% and the second bracket from 5.0% → 4.5% — the largest CT income tax cut in decades. A single filer earning $60,000 saves roughly $315/year; a joint filer earning $120,000 saves roughly $630/year. The 5.5%, 6.0%, 6.5%, and 6.99% top brackets remain unchanged, so high earners see no benefit. This income tax calculator connecticut uses the new 2026 rates by default. If a competitor calculator returns a materially higher tax on the same input, it likely hasn't been updated for TSSN 2025-1 — run yours against the CT DRS Tax Calculator on portal.ct.gov to double-check. Updated 2026-07-28.
Income Tax Calculator Connecticut: 2026 Filing Deadlines and Withholding Verification
The 2026 Connecticut income tax filing deadline is April 15, 2027 — the same day as federal Form 1040. Per the CT DRS Individual Filing Information page, six-month extensions via Form CT-1040 EXT push the deadline to October 15, 2027, but an extension to file is NOT an extension to pay — full estimated tax must be paid by April 15 to avoid the 1% monthly late-payment interest plus 10% penalty. Compare this income tax calculator connecticut output against your 2026 W-2 Box 17 (state withholding); a gap larger than $500 means you should file a new CT-W4 with your employer for 2027. Retirees receiving 1099-R distributions should confirm the CT box shows correct withholding after the retirement exclusion applies. Last updated: 2026-07-15.
Frequently Asked Questions
What is Connecticut's top income tax rate?
Connecticut's top marginal income tax rate is 6.99%. The state has 7 tax brackets with rates ranging from 3.0% to 6.99%.
How does Connecticut's income tax work?
Connecticut uses a progressive system where income is taxed at increasing rates through 7 brackets. Only income within each bracket is taxed at that bracket's rate.
How much total tax will I pay in Connecticut?
Your total tax includes both federal (10%-37%) and Connecticut state tax (up to 6.99%). Use this calculator to see the combined amount, effective rate, and take-home pay.
Does Connecticut conform to federal deductions?
Many states base their tax on federal adjusted gross income with state-specific modifications. Check Connecticut's specific rules for how deductions and exemptions apply.
How can I lower my Connecticut state income tax?
Maximize pre-tax retirement contributions (401k, IRA), use your HSA, and ensure you take all available deductions. These reduce both federal and state taxable income.
Did Connecticut cut income tax rates in 2024?
Yes. Effective tax year 2024 (filed in 2025) Connecticut permanently cut the lowest two brackets: the 3.0% bracket dropped to 2.0%, and the 5.0% bracket dropped to 4.5%. The reduction stays in place for 2026 filers and saves roughly $250-$600 per year for households earning $50K-$100K. Higher brackets (5.5%, 6.0%, 6.5%, 6.9%, 6.99%) were not cut. Source: CT DRS 2024 legislative session (Public Act 23-204).
Does Connecticut tax Social Security and pension income?
Partially. Connecticut exempts 100% of Social Security from state tax if your federal AGI is below $75,000 single or $100,000 joint; above those thresholds the exemption phases out. For 2026, CT also exempts 100% of qualifying pension and IRA distributions for filers under $75K single / $100K joint, with a phase-out above. Military retirement income is 100% exempt regardless of AGI. Source: CT DRS Form CT-1040 instructions 2026.
How do I claim the Connecticut Pass-Through Entity Tax (PET) credit?
If you receive Schedule K-1 income from a CT S-corp, partnership, or LLC, the entity pays CT income tax at the 6.99% rate, and you claim a credit equal to 87.5% of your share of that PET on your CT-1040 Schedule CT-PE. This nearly eliminates double taxation and is also one of the few ways CT residents can bypass the federal $10,000 SALT cap (the entity-level deduction reduces federal AGI directly). Confirm your K-1 reports the PET amount before claiming the credit.
Why is my Connecticut tax higher than the calculator shows?
Three common reasons: (1) Connecticut adds a recapture surtax for high earners ($200K+ single, $400K+ joint) that retroactively taxes lower bracket income at the marginal rate — a wealth-cliff effect. (2) Connecticut does not allow most federal itemized deductions, so your CT taxable income often exceeds your federal taxable income. (3) Municipal property tax (paid by check, not withheld) can add another $5,000–$15,000 on a typical CT home. This calculator handles only the state income tax — add the property tax line and any high-earner recapture manually.
When are Connecticut quarterly estimated tax payments due for 2026?
Connecticut Form CT-1040ES quarterly estimated payments for 2026 income are due April 15, 2026 (Q1), June 16, 2026 (Q2), September 15, 2026 (Q3), and January 15, 2027 (Q4) — same as federal Form 1040-ES. Use the connecticut income tax calculator to project your annual liability, then divide by 4. The safe-harbor is 100% of last year's CT tax (110% if your prior-year AGI exceeded $150K single / $75K MFS) or 90% of current-year tax. Pay online through the myConneCT portal at the CT Department of Revenue Services.
Do CT capital gains and dividends get taxed at the same rate as wages?
Yes. Connecticut has no separate capital gains or qualified dividend rate — both are taxed at your ordinary CT marginal rate, currently 2.0%–6.99%. This contrasts with the federal treatment where long-term gains and qualified dividends are taxed at 0%/15%/20%. For high-income CT residents with substantial investment income, this means a federal 15% LTCG rate effectively becomes 21.99% all-in (15% federal + 6.99% CT). Plan asset location accordingly — Roth IRAs and HSAs avoid CT tax on growth.
How accurate is this income tax calculator connecticut for 2026 filings?
This income tax calculator connecticut uses the 2026 tax-year brackets published on the CT DRS Personal Income Tax page — 7 marginal rates from 2.0% (post-2024 cut) through 6.99%, plus the 2026 federal brackets ($11,925 / $48,475 / $103,350 / $197,300 / $250,525 / $626,350 thresholds for single filers). The output is a reliable estimate for wage income up to the recapture threshold. It does not model the CT high-earner recapture surtax, the Pass-Through Entity Tax credit, or the phase-out of the retirement exclusion above $75K AGI — see the FAQ entries below for those adjustments.
When should I re-run the income tax calculator connecticut during the year?
Re-run the income tax calculator connecticut whenever your income situation changes materially: after a raise, bonus, RSU vesting, side-gig income above $600, marriage/divorce, or a new dependent. The most important re-run point is October — with 3 months of pay data left in the year, you can adjust your CT-W4 withholding or make a Q4 estimated payment via Form CT-1040ES (due January 15, 2027) to hit the safe-harbor and avoid the underpayment penalty. Compare the projected annual liability to the year-to-date withholding on your latest pay stub.