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2025 general tax rate · Middlesex County, NJ
South Plainfield property tax rate
South Plainfield's 2025 general tax rate is $7.316 per $100 of assessed value. A property assessed at $300,000 owes $21,948.00 for the year. That ranks 15th highest of New Jersey's 564 municipalities, among the highest tenth, $4.360 per $100 above the $2.960 per $100 state median.
- 1General tax rate $7.316 per $100
- 2Bill on $300,000 assessed $21,948.00
Your South Plainfield tax bill
The bill before exemptions and credits. Compare every New Jersey rate.
General rate and effective rate in South Plainfield
New Jersey publishes two rates for every municipality. The general tax rate, $7.316 per $100 in South Plainfield, is the one applied to the assessed value on the bill: $300,000 assessed owes $21,948.00. The effective tax rate, $2.023 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 South Plainfield's assessments at about 27.65% of market value, well below market value, the sign of a town that has not revalued recently; the state median is 70.02%.
The effective rate is the fairer comparison between towns. On it South Plainfield ranks 341st of 564, against 15th on the general rate, and sits $0.120 below the $2.140 median effective rate. At 27.65%, a $300,000 assessment corresponds to roughly $1,084,991 of market value.
South Plainfield's rate in 2024 and 2025
The general tax rate rose $0.330 per $100 (4.78%) from $6.982 per $100 in 2024, and the same $300,000 assessment owes $1,002.00 more than at last year's rate. In 2024 South Plainfield ranked 15th. The effective rate went from $2.038 to $2.023 per $100 (down 0.74%), and the implied ratio from 29.19% to 27.65%: market values rose faster than assessments.
Tax on common assessed values in South Plainfield
| Assessed value | 2025 bill | At the 2024 rate | Versus NJ median rate |
|---|---|---|---|
| $200,000 | $14,632.00 | $13,964.00 | +$8,712.00 |
| $300,000 | $21,948.00 | $20,946.00 | +$13,068.00 |
| $400,000 | $29,264.00 | $27,928.00 | +$17,424.00 |
| $500,000 | $36,580.00 | $34,910.00 | +$21,780.00 |
| $750,000 | $54,870.00 | $52,365.00 | +$32,670.00 |
Each bill is the assessed value divided by 100 and multiplied by $7.316, before exemptions, credits or special charges. These are assessed values, not sale prices: at 27.65% the $300,000 row is a property worth about $1,084,991. The last column is the difference from the same assessment at the $2.960 per $100 state median.
How South Plainfield compares in Middlesex County and New Jersey
Among the 25 municipalities in Middlesex County, South Plainfield ranks 3rd highest; the county median is $3.558 per $100, so South Plainfield sits $3.760 per $100 above it. The next higher rate in the county is Woodbridge Township at $12.034, and the next lower is Metuchen at $7.255. Statewide, 97% of municipalities have a lower general tax rate than South Plainfield.
Outside Middlesex County, the closest rates are Linden ($7.345, Union), Cranford Township ($7.248, Union), Rahway ($7.584, Union), Audubon Park ($6.918, Camden). 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 South Plainfield 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 South Plainfield 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 27.65% ratio implied by the state's two rates, that range runs from about 23.5% to 31.8% of market value; the Director's official average ratio for South Plainfield, 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.
South Plainfield property tax questions
What is the property tax rate in South Plainfield, NJ?
South Plainfield's 2025 general tax rate is $7.316 per $100 of assessed value; its effective rate, on market value, is $2.023 per $100. Source: New Jersey Division of Taxation.
How much is the property tax on a $300,000 assessment in South Plainfield?
$300,000 ÷ 100 × $7.316 = $21,948.00 a year, before exemptions and credits. At the 2024 rate the same assessment owed $20,946.00.
Is South Plainfield's tax rate high for New Jersey?
It ranks 15th highest of 564, among the highest tenth of New Jersey municipalities; the median is $2.960 per $100. On the effective rate, which allows for different assessment levels, it ranks 341st.
How do I appeal a South Plainfield 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.