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Tax year 2026

Connecticut vs Massachusetts Income Tax — 2026

A single filer earning $100,000 pays $855 less per year in Connecticut than in Massachusetts — $71 a month. Connecticut charges $3,925; Massachusetts charges $4,780.

Why this pair has a page: bordering states.

Connecticut at $100K
$3,925
3.92%
Massachusetts at $100K
$4,780
4.78%
Annual difference
$855
$71 a month
National ranks
27 vs 40
of 50, lowest tax first

The bill at every income

Single filer, standard deduction, no dependents. State income tax only.

Connecticut and Massachusetts income tax compared at seven income levels, 2026
Gross incomeConnecticut taxMassachusetts taxDifference
$50,000$1,325$2,280$955 less in CT
$75,000$2,550$3,530$980 less in CT
$100,000$3,925$4,780$855 less in CT
$150,000$6,850$7,280$430 less in CT
$250,000$13,025$12,280$745 less in MA
$500,000$30,215$24,780$5,435 less in MA
$1,000,000$65,152$49,780$15,372 less in MA
Annual state income tax, Connecticut versus Massachusetts
CT at $50,000: $1,325CT at $50,000$1,325MA at $50,000: $2,280MA at $50,000$2,280CT at $75,000: $2,550CT at $75,000$2,550MA at $75,000: $3,530MA at $75,000$3,530CT at $100,000: $3,925CT at $100,000$3,925MA at $100,000: $4,780MA at $100,000$4,780CT at $150,000: $6,850CT at $150,000$6,850MA at $150,000: $7,280MA at $150,000$7,280CT at $250,000: $13,025CT at $250,000$13,025MA at $250,000: $12,280MA at $250,000$12,280CT at $500,000: $30,215CT at $500,000$30,215MA at $500,000: $24,780MA at $500,000$24,780CT at $1,000,000: $65,152CT at $1,000,000$65,152MA at $1,000,000: $49,780MA at $1,000,000$49,780

How the two systems differ

Connecticut and Massachusetts income tax systems compared
ConnecticutMassachusetts
Tax structureGraduatedFlat rate
Top marginal rate6.99%9%
Number of brackets71
Standard deduction (single)NoneNone
Personal exemption$15,000$4,400
Local income taxesNoNo
Capital gainsordinaryseparate
Population (2024)3,675,0697,136,171

By filing status

Connecticut and Massachusetts tax on $100,000 by filing status, 2026
Filing statusConnecticutMassachusettsDifference
Single$3,925$4,780$855 less in CT
Married filing jointly$2,920$4,560$1,640 less in CT
Married filing separately$4,090$4,780$690 less in CT
Head of household$3,255$4,660$1,405 less in CT

Change the assumptions

Adjust income and filing status, or swap either state. The URL updates so you can share the exact comparison.

At $100,000 as a single filer, Connecticut costs $855 less per year than Massachusetts — $71 a month.

Connecticut compared with Massachusetts at $100,000
ConnecticutMassachusettsDifference
State income tax$3,925$4,780$855
Per month$327$398$71
Effective rate3.92%4.78%0.86 pts
Marginal rate5.5%5%0.50 pts
Standard deduction$0$0$0
Taxable income$85,000$95,600$10,600
Tax structureGraduatedFlat rate
Local income taxesNoNo

Full detail: Connecticut · Massachusetts · methodology

What this comparison leaves out

Sources for both states

  1. 1.Connecticut Department of Revenue ServicesState revenue department
    Form CT-1040ES, 2026 Estimated Connecticut Income Tax Payment Coupon for Individuals - Tax Calculation Schedule, Tables A through E for the 2026 taxable year
    https://portal.ct.gov/-/media/drs/forms/2025/income/ct1040es-flat0126.pdf
    Retrieved
  2. 2.Tax FoundationResearch organisation (cross-check)
    State Individual Income Tax Rates and Brackets, 2025
    https://taxfoundation.org/data/all/state/state-income-tax-rates/
    Retrieved
  3. 3.Massachusetts Department of RevenueState revenue department
    Massachusetts Tax Rates
    https://www.mass.gov/info-details/massachusetts-tax-rates
    Retrieved

Figures on this page were last checked against these sources on . Found something wrong? Report it.