In May 2026, Westport's Board of Finance did something that sounds like good news on paper. Members voted unanimously to drop the town's mill rate from 18.86 to 13.2, a cut of roughly 30 percent. If you're comparing Fairfield County towns by their published tax rate, that number makes Westport look like it just got cheaper to own a home in.
It didn't, at least not for most people. Town officials said as much in the same meeting where they approved the cut, and by the time bills went out this July, plenty of homeowners opened an envelope with a bigger number than last year, not a smaller one. The mill rate fell. The bill didn't follow it down. That gap between the headline and the invoice is the part worth understanding if you're pricing a purchase, budgeting a sale, or just trying to figure out what a "low tax rate" actually means in a town mid-revaluation.
Why the rate dropped and the bill didn't
Every five years, Connecticut requires towns to revalue every taxable property so assessments reflect what things are actually worth on the open market rather than what they were worth the last time anyone checked. Westport's revaluation used an October 1, 2025 valuation date, and the town's own 2025 Revaluation Summary is explicit that the process is designed to be revenue neutral. The town isn't supposed to collect more money just because the revaluation happened. It collects what the budget requires, and the mill rate is the number that divides that requirement across a larger or smaller total pool of assessed value.
Westport's pool got a lot bigger. Finance Director Gary Conrad told the Board of Finance that the town's overall grand list grew more than 50 percent following the revaluation. A bigger grand list mechanically produces a lower mill rate, because the same budget is now being spread across more assessed value. That's the arithmetic behind the 30 percent cut, and it's real. It's just not the whole story.
The whole story is that the grand list didn't grow evenly. Conrad reported that residential property values rose 59.55 percent on average, while commercial properties rose only 16.55 percent. Board Chair Danielle Dobin put it plainly during the meeting:
"Residential properties have appreciated roughly, on average, 60 percent in Westport, while commercial properties have appreciated only 17 percent."
Conrad attributed the gap partly to broader pressure on brick-and-mortar retail, and pointed to commercial parcels like Bridgewater Associates' Nyala Farm headquarters as an example of a property whose value simply didn't climb the way a typical single-family home did. When one category of the tax base grows three and a half times faster than another, the mill rate can fall and the residential share of the total tax burden can still rise. Both things are true at once. That's the mechanism, not a contradiction.
The same shift, playing out twice this year
Westport isn't the only Fairfield County town where this played out in 2026. Fairfield's Board of Finance set its own FY2026-27 mill rate at 19.19, down from 28.39, a cut of roughly 32 percent. Conrad told Westport's board that Fairfield experienced nearly identical shifts between residential and commercial appreciation, and other towns have gone through some version of the same rebalancing depending on how much commercial tax base they have to absorb it.
| Town | Prior mill rate | New mill rate (FY2026-27) | Approximate cut |
|---|---|---|---|
| Westport | 18.86 | 13.2 | 30% |
| Fairfield | 28.39 | 19.19 | 32% |
Fairfield's revaluation also produced friction that Westport's largely avoided in public. Board member Jim Walsh argued that a nearly 77 percent success rate on the roughly 900 assessment appeals filed pointed to a flawed process, calling it "a 100 percent failure of the revaluation." Board Chair Craig Curley pushed back, arguing that the appeal process worked as intended given how sharply residential values had moved. Whoever is right about the process, the volume of appeals tells you something useful on its own: when a revaluation year lands on top of a fast-appreciating residential market, a lot of homeowners end up disputing their number, and a meaningful share of them win at least a partial reduction.
Where your assessment landed matters more than the townwide average
Averages hide a lot. Westport's town assessor Paul Friia reported that homes north of I-95 rose about 66 percent on average during the revaluation, while homes south of I-95 rose closer to 57 percent. That's a nine-point spread inside a single town, which means the "average homeowner" the Board of Finance keeps referencing doesn't map cleanly onto any specific street.
Conrad offered one way to translate the math into dollars: a homeowner whose property appreciated at roughly the residential average would see a tax increase reflecting close to the 9.5 percentage-point gap between that average and the overall grand list growth. Local writer Dan Woog, who has tracked the revaluation closely for months, ran a simpler version of the same calculation and estimated that a homeowner at the town average, with an assessment increase near 61 percent, would see their actual dollar bill rise by roughly 11 percent even after the lower mill rate is applied. Those two figures are answering slightly different questions, one about the tax base's internal shift and one about your literal bill, but they point the same direction. If your home's value moved with the pack, plan for the bill to move up, not down, regardless of what happens to the rate.
Why comparing today's mill rate across towns can mislead you
Here's the part that matters if you're actually shopping across Westport, Weston, Fairfield, or Wilton right now. Not every town revalued in 2025. Weston, Wilton, Ridgefield, New Canaan, and Darien recently completed their own revaluations on an earlier cycle and aren't going through this reset this year. That means their current mill rates reflect a different point in their five-year clock than Westport's or Fairfield's does. A town that revalued two years ago and is coasting toward its next reset can post a mill rate that looks meaningfully different from a town that just went through the shock, and neither number tells you much about which town is actually more or less expensive to own in over a full five-year stretch.
If you're weighing towns on carrying cost, the mill rate by itself is close to useless without two more pieces of information: when did this town last revalue, and how did residential values move relative to commercial ones when it did. A few things worth asking before you write an offer:
- When was the property's town last revalued, and when is the next one scheduled.
- How did the seller's actual tax bill change year over year, not just what the current mill rate implies.
- Whether the specific neighborhood tracked above, below, or with the townwide average during the last revaluation.
- Whether any pending capital projects, like Westport's roughly $80 million in planned borrowing tied to the new Long Lots School and related municipal projects, could shape the mill rate again before your next reval cycle.
None of that shows up in a portal listing. It shows up in the assessor's records, the last 12 months of actual tax bills, and a conversation with someone who has watched a few of these cycles play out.
A quick FAQ
If my mill rate goes down, why would my bill go up? Because the mill rate is applied to your assessed value, and your assessed value likely rose faster than the rate fell. A lower rate on a much higher number can still produce a higher bill.
Does a lower mill rate mean the town is spending less? Not necessarily. Westport's total budget still grew by about 5 percent this cycle. The mill rate fell because the assessed base it's divided across grew even faster, largely on the residential side.
How do I estimate what I'd actually owe? Take the property's new assessed value, which in Connecticut is set at 70 percent of fair market value, drop the last three digits, and multiply by the current mill rate. That gives you the annual bill in dollars, which is the only number that matters when you're comparing two houses in two different towns.
If you're trying to compare real carrying costs across Westport, Weston, Fairfield, or anywhere else in this corner of Fairfield County, the mill rate on a town's website is a starting point, not an answer. Sandra Calise Cenatiempo has spent years walking buyers and sellers through exactly this kind of local nuance, town by town and street by street. Reach out to start with a free home valuation and a straight answer on what your specific property is actually likely to owe.
