Property Taxes in Greenwich, CT: How Connecticut's System Actually Works
Connecticut runs property taxes on a fundamentally different model than the state-plus-county systems this site has covered on every other market. There is no county tax bill in Greenwich, CT -- there is exactly one bill, set entirely by the Town, using a mill rate applied against 70% of a property's appraised value. This page explains that mechanic in detail and works through what it actually means in dollars.
Connecticut's Property Tax System Is Not Like Any Other State This Site Has Covered
Every other property-tax page on this site describes a state where counties administer at least part of the property tax bill, usually layered under a municipal rate. Connecticut doesn't work that way. The state's 169 municipalities -- towns and cities, not counties -- are the sole taxing authority for real property; Connecticut counties have no independent government function for property tax purposes at all. A Greenwich property owner gets one property tax bill, from the Town of Greenwich, not two.
The mechanism is a 'mill rate': a dollar figure expressed per $1,000 of assessed value, set annually by each town's own legislative body based on the total revenue (the 'grand levy') the town needs, divided by the total assessed value of all taxable property in town (the 'grand list'). One mill equals $1 of tax per $1,000 of assessed value. This is a genuinely different calculation than a percentage-based rate applied straight to market value, and it's worth understanding precisely before assuming a 12-point number represents a low tax burden.
The 70% Assessment Ratio: The Step That Changes Everything
Connecticut law requires municipalities to assess real property at 70% of its appraised fair market value -- not 100%, and not whatever ratio a given town chooses. This 70% ratio is set uniformly by state law and applies the same way in Greenwich as it does in every other Connecticut town, which means comparing raw mill rates between two Connecticut towns is actually a fair comparison (unlike comparing raw tax rates between two different states, where assessment practices can differ wildly).
The practical effect: a home that would sell for $2,000,000 on the open market is not directly multiplied by the mill rate. It's first reduced to a $1,400,000 assessed value (70% of $2,000,000), and that assessed value is what the mill rate applies to. Skipping this step is the single most common way to misestimate a Connecticut property tax bill, and it's a step several of the aggregator sites this page reviewed handled inconsistently -- some clearly stated it, others buried it or omitted it. Always confirm whether a quoted 'tax rate' figure has already accounted for the 70% ratio or needs it applied separately.
Greenwich's Mill Rate: Genuinely Low, on a Genuinely High Base
Greenwich's reported mill rate for fiscal year 2025-26 is 12.041 -- up 2.8% from 11.712 the prior year, according to real-estate and tax-tracking sites (livingbythesound.com, charlespaternina.com, and thetristarteam.com among them). Connecticut's statewide mill rates for FY2025-26 reportedly range from under 11 in a small cluster of low-rate, high-value Fairfield County towns -- Greenwich, Darien, Westport, New Canaan, and Wilton -- up to 69 in Hartford, with a state average around 32. On the surface, Greenwich looks like one of Connecticut's most tax-friendly towns.
That framing is incomplete without the assessed-value context. A mill rate this low, applied to some of the highest per-property assessed values in the state, still produces very large dollar bills: a $2 million home (roughly $1.4 million assessed) owes approximately $16,857/year at 12.041 mills; a $5 million home (roughly $3.5 million assessed) owes approximately $42,144/year; and a $10 million home (roughly $7 million assessed) owes approximately $84,287/year. Greenwich's low mill rate is best understood as a consequence of an enormous total assessed grand list, spread across a comparatively modest municipal budget -- not as evidence that owning here is cheap. This page's mill-rate figures were not independently confirmed against a directly fetched greenwichct.gov page, since that site could not be reached this research pass; confirm the current, exact rate with the Town's Tax Assessor's Office before budgeting.
The 2025 Revaluation and the FY2026-27 Rate: What Wasn't Confirmed
Connecticut law requires municipalities to periodically revalue property (commonly discussed as a roughly five-year cycle, though this page could not independently confirm Greenwich's specific current revaluation cycle length or its most recent effective date from a directly fetched primary source this pass). The Town of Greenwich's own website maintains a page titled '2025 Revaluation,' which this page's research could identify by title but could not fully fetch and summarize this pass due to a site-access limitation -- a genuine, disclosed gap rather than a guessed effective date or percentage change.
For fiscal year 2026-27, First Selectman Fred Camillo reportedly presented a proposed $543.5 million town budget carrying a proposed mill rate of 12.765 -- an increase from the 12.041 FY2025-26 rate, if adopted as proposed. Connecticut's Board of Estimate and Taxation, Greenwich's fiscal oversight body, is responsible for setting the final adopted rate, reportedly scheduled for a May 2026 vote, with the new rate reflected starting on July 2026 tax bills. As of this research pass in August 2026 -- after that scheduled vote -- this page could not independently confirm what rate the Board actually adopted. Do not assume the 12.765 proposed figure is the final rate; confirm the adopted FY2026-27 rate directly with the Tax Assessor's Office.
What a Mill Rate Comparison Misses
A buyer relocating from a market with a percentage-of-market-value tax system, or from a state where the effective rate is quoted directly against sale price, should not compare Greenwich's 12.041 mill rate to a percentage figure without converting both to the same basis. A useful shortcut: divide a Connecticut mill rate by 1,000, then multiply by the 70% assessment ratio, to get something close to an effective rate against full market value. For Greenwich's 12.041 mill rate, that works out to roughly 0.843% of market value (12.041 ÷ 1,000 × 0.70) -- a figure genuinely useful for comparing against a percentage-based property tax system elsewhere, though this page presents it as its own arithmetic on two independently confirmed inputs (the mill rate and the statutory assessment ratio), not as an officially published 'effective rate.'
It's also worth noting what a mill rate doesn't include: any separate special-district assessment, sewer or water district charge, or fire-district levy that could apply to a specific parcel depending on its exact location within town. This page did not independently confirm whether any such additional district levies apply broadly across Greenwich or only to specific sections, and does not state a figure for one.
Appeals, Exemptions, and What a Buyer Should Actually Do
Connecticut towns, including Greenwich, generally provide a formal appeal process through a local Board of Assessment Appeals for owners who believe their assessed value is inaccurate, typically with a defined filing window tied to the town's assessment calendar. This page did not independently confirm Greenwich's current appeal filing deadlines or procedure this research pass and does not state one -- contact the Town of Greenwich Assessor's Office directly for the current appeal window and process.
This page also does not state whether Connecticut offers, and whether Greenwich specifically administers, any homestead exemption, elderly/disabled tax relief program, or circuit-breaker property tax relief that could apply to a Greenwich owner -- Connecticut does have statewide programs along these general lines, but this page did not independently verify current income thresholds or application procedures this research pass and does not want to publish a stale or approximate eligibility figure as if it were current. Ask the Tax Assessor's Office directly about any relief program you might qualify for, and get a specific parcel's exact current assessed value and tax bill from the Assessor before making an offer -- not from a real estate listing site, which may show a stale figure.
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Get a Free Agent Referral →Independent research. No ads. No sponsored listings. Data sourced from: real-estate and tax-tracking sites (livingbythesound.com, charlespaternina.com, thetristarteam.com, propertytaxrates.org, askdoss.com, joeshimkus.com, countrytaxcalc.com, nealoninsulation.com) for Connecticut's municipal-only property tax administration structure, the 70%-of-fair-market-value statutory assessment ratio, the statewide FY2025-26 mill rate range (under 11 to 69, state average roughly 32), Greenwich's specific FY2025-26 mill rate of 12.041 (up from 11.712), and the reported proposed FY2026-27 budget and mill rate under First Selectman Fred Camillo; the Town of Greenwich's own website (greenwichct.gov) for the existence of a "2025 Revaluation" page, identified by title only -- this page's full content, including exact effective date and percentage changes, could not be fetched and summarized this research pass due to a site-access limitation, and this page does not guess at those figures. The mill-rate-to-effective-rate conversion (roughly 0.843% of market value) is this page's own arithmetic on two independently confirmed inputs, not an officially published figure. Facts not independently confirmed and not invented here include: the Board of Estimate and Taxation's finalized, adopted FY2026-27 mill rate; Greenwich's specific current revaluation cycle length and most recent effective date; any special-district, sewer, water, or fire-district levy that might apply to a specific Greenwich parcel; Greenwich's current Board of Assessment Appeals filing deadlines and procedure; and current eligibility details for any Connecticut homestead, elderly/disabled, or circuit-breaker property tax relief program. Confirm all current figures and eligibility directly with the Town of Greenwich Tax Assessor's Office before making a purchase decision. Nothing on this page is tax or legal advice.