:root {
–primary-color: #003366;
–secondary-color: #f4f4f4;
–accent-color: #e6b800;
–text-color: #333;
–border-radius: 8px;
}
body {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
line-height: 1.6;
color: var(–text-color);
max-width: 800px;
margin: 0 auto;
padding: 20px;
}
.calculator-card {
background: #fff;
border: 1px solid #ddd;
border-radius: var(–border-radius);
box-shadow: 0 4px 6px rgba(0,0,0,0.1);
padding: 30px;
margin-bottom: 40px;
}
.calc-header {
text-align: center;
margin-bottom: 25px;
border-bottom: 2px solid var(–primary-color);
padding-bottom: 15px;
}
.calc-header h2 {
margin: 0;
color: var(–primary-color);
}
.form-group {
margin-bottom: 20px;
}
.form-group label {
display: block;
font-weight: 600;
margin-bottom: 8px;
color: var(–primary-color);
}
.input-wrapper {
position: relative;
}
.input-wrapper input {
width: 100%;
padding: 12px;
font-size: 16px;
border: 1px solid #ccc;
border-radius: 4px;
box-sizing: border-box;
}
.prefix {
position: absolute;
left: 12px;
top: 50%;
transform: translateY(-50%);
color: #666;
}
.input-wrapper input.has-prefix {
padding-left: 25px;
}
.calc-btn {
display: block;
width: 100%;
background-color: var(–primary-color);
color: white;
border: none;
padding: 15px;
font-size: 18px;
font-weight: bold;
border-radius: 4px;
cursor: pointer;
transition: background 0.3s;
margin-top: 10px;
}
.calc-btn:hover {
background-color: #002244;
}
.results-area {
margin-top: 25px;
background-color: var(–secondary-color);
padding: 20px;
border-radius: var(–border-radius);
display: none;
}
.result-row {
display: flex;
justify-content: space-between;
margin-bottom: 10px;
padding-bottom: 10px;
border-bottom: 1px solid #ddd;
}
.result-row:last-child {
border-bottom: none;
margin-bottom: 0;
padding-bottom: 0;
}
.result-label {
font-weight: 600;
}
.result-value {
font-weight: 700;
color: var(–primary-color);
}
.final-tax {
font-size: 1.4em;
color: #d9534f;
}
.content-section {
margin-top: 40px;
}
.content-section h2 {
color: var(–primary-color);
border-left: 5px solid var(–accent-color);
padding-left: 15px;
}
.content-section h3 {
margin-top: 25px;
}
table {
width: 100%;
border-collapse: collapse;
margin: 20px 0;
}
table, th, td {
border: 1px solid #ddd;
}
th, td {
padding: 12px;
text-align: left;
}
th {
background-color: var(–primary-color);
color: white;
}
tr:nth-child(even) {
background-color: #f2f2f2;
}
.info-box {
background-color: #e8f4fd;
border-left: 5px solid #2196F3;
padding: 15px;
margin: 20px 0;
}
@media (max-width: 600px) {
body { padding: 10px; }
.calculator-card { padding: 15px; }
}
function calculateCTTax() {
// 1. Get input values
var marketValInput = document.getElementById('marketValue').value;
var millRateInput = document.getElementById('millRate').value;
// 2. Parse numbers
var marketVal = parseFloat(marketValInput);
var millRate = parseFloat(millRateInput);
// 3. Validation
if (isNaN(marketVal) || marketVal < 0) {
alert("Please enter a valid Market Value.");
return;
}
if (isNaN(millRate) || millRate < 0) {
alert("Please enter a valid Mill Rate.");
return;
}
// 4. CT Specific Logic: Assessed Value is 70% of Market Value
var assessmentRatio = 0.70;
var assessedVal = marketVal * assessmentRatio;
// 5. Mill Rate Calculation Logic: (Assessed Value * Mill Rate) / 1000
var annualTax = (assessedVal * millRate) / 1000;
var monthlyTax = annualTax / 12;
// 6. Formatting Helpers
var formatter = new Intl.NumberFormat('en-US', {
style: 'currency',
currency: 'USD',
minimumFractionDigits: 2,
maximumFractionDigits: 2
});
// 7. Update DOM
document.getElementById('dispMarketVal').innerText = formatter.format(marketVal);
document.getElementById('dispAssessedVal').innerText = formatter.format(assessedVal);
document.getElementById('dispMillRate').innerText = millRate.toFixed(2);
document.getElementById('dispTotalTax').innerText = formatter.format(annualTax);
document.getElementById('dispMonthlyTax').innerText = formatter.format(monthlyTax);
// 8. Show Results
document.getElementById('results').style.display = 'block';
}
Understanding the Connecticut Mill Rate and Property Taxes
Property taxes in Connecticut are calculated locally by each municipality using a system based on Mill Rates and Assessed Property Value. Unlike many other states, Connecticut uses a uniform assessment ratio across all towns, making the calculation formula consistent regardless of where you live, though the specific mill rate changes from town to town.
What is a Mill Rate?
A "mill" represents one-thousandth of a dollar. In property tax terms, a mill rate is the amount of tax payable per dollar of the assessed value of a property.
The Math: 1 Mill = $1.00 of tax for every $1,000 of assessed value.
For example, if a town has a mill rate of 25.00, you will pay $25.00 in taxes for every $1,000 of your property's assessed value.
The 70% Assessment Rule
A critical component of the Connecticut property tax equation is the assessment ratio. In Connecticut, municipalities do not tax you on 100% of your home's market value. Instead, taxes are levied on the Assessed Value, which is mandated by state law to be 70% of the fair market value (appraised value).
If you buy a house for $500,000 (Market Value), the town will assess it at $350,000 ($500,000 × 0.70). The mill rate is then applied to the $350,000 figure, not the full $500,000.
The Calculation Formula
To calculate your property tax bill manually, follow these steps:
- Determine Market Value: The appraised fair market value of your home.
- Calculate Assessed Value: Multiply Market Value by 0.70.
- Apply Mill Rate: Multiply Assessed Value by the Mill Rate.
- Divide by 1,000: Divide the result by 1,000 to get your annual tax.
Formula: (Market Value × 0.70 × Mill Rate) ÷ 1,000 = Annual Tax
Example Calculation
Let's say you live in Stamford, CT, and your home has a market value of $600,000. Assume the current mill rate is 27.17.
- Market Value: $600,000
- Assessed Value: $600,000 × 0.70 = $420,000
- Calculation: ($420,000 × 27.17) ÷ 1,000
- Annual Tax: $11,411.40
Common CT Mill Rate Ranges
Mill rates in Connecticut vary significantly depending on the town's budget requirements and total property wealth. Rates typically change every fiscal year (July 1st). Below are examples of how rates can differ (Note: These are historical examples for reference only; always verify current rates with the local tax assessor).
| Town Type |
Typical Mill Rate Range |
Impact on $300k Assessment |
| Low Tax Rate Towns (e.g., Greenwich, Salisbury) |
11.00 – 15.00 |
$3,300 – $4,500 |
| Average Rate Towns (e.g., Fairfield, Milford) |
25.00 – 30.00 |
$7,500 – $9,000 |
| High Rate Cities (e.g., Hartford, Waterbury) |
50.00 – 70.00+ |
$15,000 – $21,000 |
Frequently Asked Questions
Does the mill rate apply to cars in CT?
Yes, Connecticut also levies property taxes on motor vehicles. However, there is often a statewide cap on the mill rate for motor vehicles, which may be lower than the real estate mill rate in towns with very high taxes.
How often does the mill rate change?
Mill rates are set annually by the town's board of finance or town council during the budget process, usually in late spring, taking effect on July 1st.
What is a revaluation?
Connecticut law requires towns to revalue all property every five years. During a revaluation year, your market value (and thus assessed value) may change significantly, which will alter your tax bill even if the mill rate stays the same.