Greenwich property taxes are calculated by applying the town’s mill rate to 70% of a property’s fair market value, then billed in two installments for real estate (July 1 and January 1) and one installment for motor vehicles and business personal property (July 1). The mill rate for the 2025–2026 fiscal year is 12.041, meaning $12.041 in tax for every $1,000 of assessed value. Each installment carries a one-month grace period before interest begins to accrue, retroactively, at 18% per year.
How the Bill Is Calculated
Connecticut law requires every municipality to assess real property at a uniform 70% of fair market value.1Connecticut General Statutes. Connecticut Code 12-62a – Uniform Assessment Date and Rate A home the Greenwich Assessor values at $1,000,000 therefore has an assessed value of $700,000.
A mill equals $1 of tax per $1,000 of assessed value.2State of Connecticut Office of Policy and Management. Mill Rates At 12.041 mills, that $700,000 assessment produces an annual tax of 700 × 12.041 = $8,428.70 before any exemptions. The arithmetic is simple; the assessed value is where disputes tend to come up.
What Greenwich Taxes
Three categories appear on the grand list. Real estate covers residential homes, commercial buildings, and undeveloped land, valued by the Assessor based on condition, location, and comparable sales. Motor vehicles registered in Greenwich (cars, motorcycles, trailers) are taxed separately, and a vehicle does not have to be running to be taxable so long as it holds a valid Connecticut registration at the address. Business personal property, including office furniture, machinery, and computer equipment, is the third category, and business owners must declare these assets annually.
When Payments Are Due
Real estate taxes are billed in two equal installments due July 1 and January 1. Motor vehicle and personal property taxes are each billed once, due July 1.3Greenwich Town Hall. Frequently Asked Questions – When Is Tax Payment Due?
Connecticut adds a one-month grace period to each installment. July 1 bills must be paid by August 1, and the January 1 real estate installment must be paid by February 1, to avoid interest.3Greenwich Town Hall. Frequently Asked Questions – When Is Tax Payment Due?
There’s also a supplemental motor vehicle bill. If you register a vehicle in Greenwich after October 1, it won’t appear on the regular July grand list; you’ll receive a supplemental bill due the following January 1, with a February 1 grace deadline.
What Late Payment Costs
Delinquent taxes accrue interest at 18% per year, or 1.5% per month, and the interest runs retroactively from the original due date, not from the end of the grace period.4Connecticut General Statutes. Connecticut Code 12-146 – Delinquent Tax or Installment, Interest, Waiver of Interest A July 1 bill paid on August 2 therefore owes two months of interest, not one day.
Any fractional month counts as a full month, so being one day late means being charged for the whole month.4Connecticut General Statutes. Connecticut Code 12-146 – Delinquent Tax or Installment, Interest, Waiver of Interest The minimum interest charge is $2.00, but on a Greenwich tax bill the actual charge will be much higher.
If taxes stay unpaid long enough, the Tax Collector can levy against the property and sell it at public auction. State law requires nine to twelve weeks of published notice, and the owner has six months after the sale to redeem the property by paying all back taxes, interest, charges, and 18% annual interest on the purchase price.5Connecticut General Statutes. Connecticut Code 12-157 – Sale of Real Estate for Unpaid Taxes Tax sales are rare in Greenwich, but the town does use the mechanism.
How to Pay Your Greenwich Tax Bill
Before paying, look up your bill through the Tax Collector’s online tool to confirm the exact amount owed. Past the grace period, the system displays the total including accrued interest, and you need to pay that figure, not the original bill amount, to clear the account.
- Online at mytaxbill.org, by electronic funds transfer for a $2.00 convenience fee, or credit card, Apple Pay, or Google Pay at 2.50% of the payment. Fees go to the payment vendor, not the town.6Greenwich Town Hall. Tax Collector
- In person at the Tax Collector’s window at Town Hall during business hours. Bring the whole bill so staff can scan the barcode.
- By mail to the address on the bill. The postmark date determines whether you’re within the grace period.
Keep the confirmation number or receipt. It’s the proof you’ll need if a payment is later disputed or misapplied.
If a Mortgage Servicer Pays Your Taxes
If your mortgage includes an escrow account, the servicer typically pays Greenwich directly. Federal rules require servicers to disburse escrow funds by the deadline to avoid a penalty from the taxing authority.7Consumer Financial Protection Bureau. Escrow Accounts Errors still happen, and when a servicer misses a deadline or pays the wrong amount, the interest lands on your property. Compare your annual escrow statement against the town’s records, particularly after a revaluation year when the amount owed may have changed sharply.
Exemptions and Credits That Reduce the Bill
Greenwich offers several reductions for qualifying residents, none of which apply automatically. Each requires paperwork filed with the Assessor’s Office by a specific deadline.8Greenwich Town Hall. Tax Credits and Benefits
- Senior tax relief for residents 65 and older who meet income guidelines. Applications are accepted February 1 through May 15, with refiling required every two years.
- Veterans who served at least 90 days during a wartime period with an honorable discharge qualify for an exemption on real estate or one motor vehicle. The DD-214 must be filed with the Town Clerk before October 1.
- Disabled veterans receiving a VA disability pension qualify for an additional exemption, filed once unless status changes.
- Active-duty service members can have one passenger vehicle exempted, with a commanding officer’s letter submitted annually by December 31.
- Legally blind residents receive a $3,000 reduction in assessed value with certification filed before October 1.
- Residents on Social Security disability qualify for a $1,000 assessment reduction, with the award letter filed before October 1.
Most of these reduce assessed value rather than the tax bill directly. A $3,000 reduction at the 12.041 mill rate saves about $36 a year. The senior tax credit can be worth more, depending on income tier.
Revaluation and Appealing Your Assessment
Connecticut requires each municipality to revalue all real property at least every five years.9Connecticut General Statutes. Connecticut Code 12-62 – Revaluation of Real Property Greenwich’s most recent revaluation took effect October 1, 2025, so the new assessed values appear on bills starting in the 2026–2027 fiscal year.10Greenwich Town Hall. 2025 Revaluation Between revaluations, the Assessor still adjusts individual values for new construction, major renovations, or changes in use.
Revaluation years tend to produce sharp increases, because a stronger real estate market pushes market values up and the 70% ratio carries most of that increase onto the tax bill. The mill rate often drops after a revaluation as the total grand list grows, but your bill can still rise if your property appreciated faster than the town average.
If a new assessed value looks wrong, start with an informal review at the Assessor’s Office, where you can discuss comparables and point out errors. If that doesn’t resolve it, file a formal appeal with Greenwich’s Board of Assessment Appeals under Connecticut General Statutes Section 12-111.11Connecticut General Assembly. Property Tax Assessment – Chapter 203 Written appeals must be postmarked or hand-delivered by February 20 at 5:00 PM. The Board holds hearings in March and issues written decisions by March 31.10Greenwich Town Hall. 2025 Revaluation Motor vehicle appeals follow a separate September filing window. A Board denial can be taken to Superior Court in Stamford.
One point people miss: you must pay the bill while an appeal is pending. If the Board reduces the assessment, the town refunds the difference. Skipping payment during an appeal triggers the same 18% interest as any other late bill.
Federal Deduction Limits
Greenwich property taxes are deductible on your federal return if you itemize on Schedule A, but the deduction for all state and local taxes combined, property taxes plus state income and sales taxes, is capped. For 2025, the limit is $40,000 for most filers ($20,000 if married filing separately), with inflation adjustments in later years.12Internal Revenue Service. How to Update Withholding to Account for Tax Law Changes for 2025 The cap phases down for modified adjusted gross income above $500,000 ($250,000 if married filing separately). For many Greenwich homeowners who also pay Connecticut income tax, a portion of property taxes goes undeducted.
When a home changes hands mid-year, the property tax deduction is split between buyer and seller based on days of ownership.13Internal Revenue Service. Publication 530, Tax Information for Homeowners The allocation appears on the closing statement and governs what each side can claim, regardless of who actually wrote the check to the town.