A Southington listing sheet this fall may show two tax numbers. One is the town's mill rate, now 23.29, about 30% below the 33.21 that Southington billed for fiscal 2025-26. The other is the annual tax on the house itself. If that figure comes from a bill issued before July 2026, it was calculated on the home's old assessment at the old rate. The town has not billed either half of that combination since July.
Neither number tells a buyer what the house will cost to own. The October 1, 2025 revaluation raised assessments sharply, so the rate came down. But values did not rise evenly across town. The homes that gained the most value now carry a larger share of the tax bill, and those are the modest, mid-priced homes that draw the most competition from buyers.
The Rate Fell Because the Tax Base Grew Faster
Connecticut requires every town to revalue property every five years. Every tenth year, the revaluation also includes a physical inspection, and 2025 was Southington's inspection year. The town hired Municipal Valuation Services for the work. Its staff photographed homes from the street over the summer of 2025, and assessment notices went out in late November, as the Southington Outsider reported. Assessments are set at 70% of market value.
When the new Grand List came in, it was much larger. According to the Bristol Press, Assessor Erin O'Connell put the 2025 total at $6,852,451,036. Real estate accounted for $5,933,470,333 of that, up 53.7% from $3,859,578,608 on the 2024 list. Eversource is the largest taxpayer on the list. "The grand list increased dramatically due to the revaluation," Town Manager Alex Ricciardone told the paper.
A larger tax base lets the town collect the same amount at a lower rate. Board of Finance Chair John Leary had said that was the aim before notices went out: "Even with revaluation, the Town is not looking for one penny more in taxes." The budget then grew, though. The Town Council adopted a $193,510,798 spending plan for fiscal 2026-27 on May 11, Patch reported. The first budget sent to the Board of Finance in February anticipated a 9.5% tax increase. By the time the board set the 23.29 rate on May 18, that had been cut to 3.71%, according to the Southington Outsider.
So the rate fell by about 30% while the total tax collected went up. The new rate fixes what each $1,000 of assessed value pays. How each house's assessment changed decides how much of the total that house carries.
The Break-Even Is About 42.6%
Simple division shows which homes paid more after the revaluation. The old rate divided by the new rate is 33.21 ÷ 23.29, or about 1.426. A home whose assessment rose about 42.6% has roughly the same tax bill as before. Any home that rose more than that pays more, and any home that rose less pays less.
The townwide real-estate Grand List rose 53.7%, well above the break-even. A home that rose by exactly that much would pay about 7.8% more on the new rate. The 53.7% includes new construction along with revalued existing homes, so treat it as a reference point rather than the typical home's change.
The table uses round numbers to show how the break-even works out. The homes are hypothetical, not actual Southington properties.
| Hypothetical home | Old assessment | Old bill at 33.21 | Assessment change | New assessment | New bill at 23.29 | Bill change |
|---|---|---|---|---|---|---|
| Below break-even | $250,000 | $8,303 | +30% | $325,000 | $7,569 | about −9% |
| At break-even | $250,000 | $8,303 | +42.6% | $356,500 | $8,303 | about 0% |
| Townwide average | $250,000 | $8,303 | +53.7% | $384,250 | $8,949 | about +8% |
| Above average | $250,000 | $8,303 | +60% | $400,000 | $9,316 | about +12% |
Every home in the table started with the same bill. The tax change depends entirely on how far each home's value moved compared with the rest of town.
Where the Bigger Increases Landed
According to Leary, the largest increases did not fall evenly across price ranges. The Southington Outsider summarized his account to the board:
"more modest" homes jump in assessed value due to market forces such as increased demand locally. This increase happened even as larger properties, including commercial properties, stayed largely the same in value.
That is a shift in who carries the tax load. Larger homes and commercial buildings whose values held roughly steady fell below the 42.6% break-even and saw lower bills. Modest homes whose values jumped absorbed more of the total. The board said it kept the overall increase small with the owners who could least afford it in mind. Even so, a 3.71% townwide increase still means much larger increases for homes that rose well above average.
The same article reports that many owners won appeals of their new assessments, which trimmed the Grand List slightly. Nine owners of properties assessed above $1 million were also pursuing appeals, which O'Connell said could become a much longer legal process. She did not expect the Grand List to change significantly as a result.
The Homes Buyers Want Most Took the Biggest Increases
The latest SmartMLS figures show the same pattern of demand. In September 2026, single-family homes in Southington sold for a median of $495,000 across 37 closings. Sellers received 103.5% of list price on average, and there were 49 homes for sale, or 1.7 months of supply. The year-to-date median through September was $475,000, up 3.8% from the same period in 2025.
Sales above asking price with less than two months of supply are the kind of demand Leary described as pushing up modest homes' values. For a buyer, that means the house that is hardest to win may also carry one of the bigger post-revaluation tax increases.
There is one sign of easing. Single-family homes took a median 22 days to sell in September 2026, up from 15 in September 2025. Pending sales were down 28.6% over the same period, and new listings were down 32.7%. The market is still competitive, just slower than a year ago. Condos and townhouses sold for a median of $320,500 in September 2026, also at 22 days on market.
Turning a Southington List Price Into a Tax Estimate
The formula is the one on the Revenue Collector's FAQ: assessment times mill rate equals tax. At the September 2026 median, the rough math works like this:
- Take 70% of $495,000, which gives a $346,500 assessment if the town's value matched the sale price.
- Multiply by 23.29 per $1,000, which gives about $8,070 a year.
- Compare that with the tax figure on the listing. If the listing is far higher or lower, check which bill year it came from.
Steps one and two assume the town's assessment matches the sale price. In practice, the bill is calculated on the house's current assessment, so that figure, not the list price, decides the tax. Step three matters because an older bill shows the old split between a lower assessment and the 33.21 rate. That figure may be far from what the house is billed now. Before the new rate was set, the town told owners not to multiply new assessments by the old rate.
Dates for a Fall or Winter Closing
For a buyer closing in the next few months, these dates come next. The Revenue Collector's FAQ lists two payment deadlines for avoiding interest: August 3, 2026 for bills due July 1, 2026, and February 1, 2027 for its January bills. Late payments accrue interest at 1.5% a month, or 18% a year, from the due date, and the FAQ says the collector cannot waive it.
The Assessor's Office says applications for real estate appeals on the 2026 Grand List will be posted in its document center in January 2027. In the last appeal round, informal hearings considered a change only if the owner showed that the appraised value exceeded current market value. Hearing officers could discuss market value but not tax rates or bills.
This is general information, not tax or legal advice. Check the assessment, prorations and appeal options for a specific property with the town and with your attorney or tax professional.
Quick Answers
Did everyone's taxes go down when the mill rate dropped? No. The rate dropped because assessments rose. Whether a particular bill went up or down depends on whether that home's assessment rose more or less than about 42.6%.
What Southington mill rate applies now? 23.29 mills on the October 1, 2025 Grand List, covering real estate, personal property and motor vehicles, starting with bills due July 1, 2026.
Where can I find the rate history? The town posts it on the Assessor's mill rate page, and the state's Office of Policy and Management publishes the rates for every Connecticut town.
When we price a Southington listing or put together an offer, we start from the house's current assessment, because the tax bill a buyer will actually pay affects what the house is worth to them. If you are weighing a home in Southington and want the real carrying cost before you write a number, Kristen Duchene and the team at Litchfield County Real Estate will run the math with you. Contact us.
