Fairfield County CT Mill Rate & Income Tax Arbitrage Guide (2026): Greenwich, Darien, New Canaan, Westport & Stamford
Calculate 2026 Fairfield County CT property taxes (70% assessment ratio × Mill Rate), CT 6.99% income tax vs. NYC 14.78%, and motor vehicle mill caps in Greenwich, Darien & Westport.
By Pablo Cirre Gómez and East Corp Capital Quantitative Desk
For hedge fund principals, private equity partners, and corporate executives relocating out of Manhattan, Fairfield County, Connecticut offers a double-barreled tax arbitrage that neither Westchester County nor Northern New Jersey can match. First, Connecticut’s top marginal state income tax rate caps out at 6.99%—compared with 14.776% in New York City and 10.75% in New Jersey. Second, thanks to Connecticut’s statutory 70% assessment ratio and extraordinary coastal grand lists, towns like Greenwich (0.84% effective property tax rate), Darien (1.24%), New Canaan (1.32%), and Westport (1.33%) charge roughly half the annual property tax of Scarsdale NY or Short Hills NJ.
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How Connecticut’s 70% Assessment Ratio & Mill Rate Formula Works
Under Connecticut General Statutes § 12-62a, every municipality in Connecticut assesses real property at exactly 70% of its Fair Market Value as determined during the town’s five-year state-mandated revaluation. Property tax rates are expressed in Mills (dollars of tax per $1,000 of assessed value). Therefore, to convert any Connecticut town’s published Mill Rate into a true effective property tax percentage on market value, multiply the Mill Rate by 0.07% (0.70 ÷ 1,000).
For example, in Greenwich, a 12.05 Mill Rate multiplied by 70% equals an effective property tax rate of just 0.8435%—meaning a $2,000,000 Greenwich home (assessed at $1,400,000) owes only $16,870 per year in property tax, compared with $44,800 per year for a $2,000,000 home in Scarsdale, NY.
2026 Town-by-Town & Jurisdiction Benchmark Table
| Municipality / Jurisdiction | 2026 Rate / Ratio | Effective Tax / Cost | Key Statutory & Commuter Note |
|---|---|---|---|
| Greenwich | 12.05 Mills | 0.84% Effective | $16,870 / yr on $2M · Hedge fund & grand list base yields lowest tax in Tri-State |
| Darien | 17.65 Mills | 1.24% Effective | $24,710 / yr on $2M · 52-min Metro-North New Haven Line express; beaches |
| New Canaan | 18.80 Mills | 1.32% Effective | $26,320 / yr on $2M · Top CT school district; charming village center |
| Westport | 18.95 Mills | 1.33% Effective | $26,530 / yr on $2M · Compo Beach; Saugatuck waterfront & hedge fund corridor |
| Wilton / Ridgefield | 27.40 Mills | 1.92% Effective | $38,360 / yr on $2M · Lower price per sq ft than coastal towns; higher millage |
| Stamford | 26.80 Mills | 1.88% Effective | $37,520 / yr on $2M · 36-min Acela/Metro-North super-express to Grand Central |
When Do You Actually Get Connecticut’s 6.99% Income Tax Rate (vs. NYC’s 10.9% IT-203)?
Here is the critical distinction every Fairfield County buyer must model: if you move from Manhattan to Greenwich or Darien and continue commuting into a Manhattan office, you immediately eliminate the 3.876% NYC resident tax on all income AND pay Connecticut’s capped 6.99% rate on your non-NY investment income, dividends, and capital gains—while your Manhattan W-2 salary remains taxed at New York State IT-203 rates (6.0%–10.9%, credited against CT tax on Schedule CT-IT). However, if your fund or employer opens a bona fide office in Greenwich or Stamford and you work inside Connecticut, your W-2 salary and bonus also drop from NY’s 9.65%–10.90% bracket down to Connecticut’s 6.99% cap.
Frequently Asked Questions & Statutory Rules (2026)
Why is Greenwich’s effective property tax rate (0.84%) less than half of Westchester or Bergen County?
Greenwich has the largest commercial and residential Grand List in Connecticut ($36+ billion in assessed value at 70%), allowing the town to fund public schools, beaches, and municipal services with no long-term bond debt and a 12.05 mill rate.
What is Connecticut’s Motor Vehicle Property Tax (Car Tax) and how is it capped in 2026?
In Connecticut, towns levy an annual local property tax on registered motor vehicles based on statutory depreciation schedules of MSRP, subject to a state-mandated maximum Motor Vehicle Mill Rate cap of 32.46 mills (and only 12.05–18.95 mills in Greenwich, Darien, New Canaan, and Westport).
Does Connecticut have a Mansion Tax or Real Estate Conveyance Tax?
Connecticut imposes a Seller Conveyance Tax (not a buyer Mansion Tax): sellers pay 0.75% on the first $800,000, 1.25% from $800,000 to $2.5 million, and 2.25% on the portion above $2.5 million (plus 0.25%–0.50% municipal conveyance tax).
Can I claim a Connecticut income tax credit for the 2.25% Mansion Tax tier paid on selling my CT home?
Yes! Under C.G.S. § 12-494(c), Connecticut residents who pay the top 2.25% state conveyance tax tier on the sale of their primary residence above $2.5 million can claim that excess conveyance tax back as a property tax credit against their CT income tax over three years starting in the third year after the sale.