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2025 general tax rate · Middlesex County, NJ
Middlesex property tax rate
Middlesex's 2025 general tax rate is $2.120 per $100 of assessed value. A property assessed at $300,000 owes $6,360.00 for the year. That ranks 420th highest of New Jersey's 564 municipalities, below the middle, $0.840 per $100 below the $2.960 per $100 state median.
- 1General tax rate $2.120 per $100
- 2Bill on $300,000 assessed $6,360.00
Your Middlesex tax bill
The bill before exemptions and credits. Compare every New Jersey rate.
General rate and effective rate in Middlesex
New Jersey publishes two rates for every municipality. The general tax rate, $2.120 per $100 in Middlesex, is the one applied to the assessed value on the bill: $300,000 assessed owes $6,360.00. The effective tax rate, $2.164 per $100, is "the general property tax adjusted by the municipality's equalization ratio", the rate on market value. Dividing one by the other puts Middlesex's assessments at about 102.08% of market value, above market value on average; the state median is 70.02%.
The effective rate is the fairer comparison between towns. On it Middlesex ranks 272nd of 564, against 420th on the general rate, and sits $0.020 above the $2.140 median effective rate. At 102.08%, a $300,000 assessment corresponds to roughly $293,887 of market value.
Middlesex's rate in 2024 and 2025
The general tax rate fell $0.190 per $100 (8.38%) from $2.314 per $100 in 2024, and the same $300,000 assessment owes $582.00 less than at last year's rate. In 2024 Middlesex ranked 387th. The effective rate went from $2.288 to $2.164 per $100 (down 5.42%), and the implied ratio from 98.88% to 102.08%.
Tax on common assessed values in Middlesex
| Assessed value | 2025 bill | At the 2024 rate | Versus NJ median rate |
|---|---|---|---|
| $200,000 | $4,240.00 | $4,628.00 | −$1,680.00 |
| $300,000 | $6,360.00 | $6,942.00 | −$2,520.00 |
| $400,000 | $8,480.00 | $9,256.00 | −$3,360.00 |
| $500,000 | $10,600.00 | $11,570.00 | −$4,200.00 |
| $750,000 | $15,900.00 | $17,355.00 | −$6,300.00 |
Each bill is the assessed value divided by 100 and multiplied by $2.120, before exemptions, credits or special charges. These are assessed values, not sale prices: at 102.08% the $300,000 row is a property worth about $293,887. The last column is the difference from the same assessment at the $2.960 per $100 state median.
How Middlesex compares in Middlesex County and New Jersey
Among the 25 municipalities in Middlesex County, Middlesex ranks 22nd highest; the county median is $3.558 per $100, so Middlesex sits $1.440 per $100 below it. The next higher rate in the county is Dunellen at $2.448, and the next lower is Cranbury Township at $1.836. Statewide, 25% of municipalities have a lower general tax rate than Middlesex.
Outside Middlesex County, the closest rates are Millstone Township ($2.116, Monmouth), Green Brook Township ($2.125, Somerset), Lambertville ($2.126, Hunterdon), Mahwah Township ($2.127, Bergen). Because towns assess at different shares of market value, the effective rate is the better guide to what a house of a given price pays.
Appealing a Middlesex assessment
New Jersey appeals go to the Middlesex County Board of Taxation. The petition is due April 1, or May 1 in a year when Middlesex implemented a municipal-wide revaluation or reassessment (NJ Division of Taxation). Property assessed above $1,000,000 may go directly to the Tax Court, and a County Board judgment can be appealed to the Tax Court within 45 days. The Board tests the assessment against the common level range: the average ratio plus or minus 15%. Using the 102.08% ratio implied by the state's two rates, that range runs from about 86.77% to 117.39% of market value; the Director's official average ratio for Middlesex, which the County Board applies, can differ slightly.
The New Jersey appeal page sets out each step with its source and the ratio arithmetic. This is a summary of the published procedure, not legal advice.
Middlesex property tax questions
What is the property tax rate in Middlesex, NJ?
Middlesex's 2025 general tax rate is $2.120 per $100 of assessed value; its effective rate, on market value, is $2.164 per $100. Source: New Jersey Division of Taxation.
How much is the property tax on a $300,000 assessment in Middlesex?
$300,000 ÷ 100 × $2.120 = $6,360.00 a year, before exemptions and credits. At the 2024 rate the same assessment owed $6,942.00.
Is Middlesex's tax rate high for New Jersey?
It ranks 420th highest of 564, below the middle of New Jersey municipalities; the median is $2.960 per $100. On the effective rate, which allows for different assessment levels, it ranks 272nd.
How do I appeal a Middlesex property assessment?
Petition to the County Board of Taxation: by April 1 (May 1 after a municipal-wide revaluation) (NJ Division of Taxation; Guide to Tax Appeal Hearings). Then: county board hearing and judgment (Set by the County Board); appeal to the tax court (Within 45 days of the County Board's judgment).
Source: New Jersey Division of Taxation, 2025 General Tax Rates (general and effective tax rates by county and municipality); prior year from the 2024 General Tax Rates. Appeal steps: NJ Division of Taxation, Assessment and Appeals (updated August 15, 2025); NJ Division of Taxation, A Guide to Tax Appeal Hearings (revised 2022). Last checked October 21, 2026. This page explains published figures; it is not tax or legal advice.