Middlesex County, New Jersey

South Plainfield, N.J. Property Tax Rate 2026

Official 2025 Division of Taxation rates for South Plainfield. The general rate is per $100 of assessed value. A sale price is not an assessed value.

General tax rate
7.316

per $100 assessed

Effective tax rate
2.023

per $100 market value

Equalization ratio
27.65%

assessed ÷ market, from the two rates

Example tax bills

Approximation using the effective rate. The general rate is applied to the equalized assessment, not the sticker price.

  • $500,000 market value → assessed about $138,259 → about $10,115/year
  • $750,000 market value → assessed about $207,388 → about $15,173/year

Check a South Plainfield address

See the assessment, comps, and whether a Chapter 123 appeal is worth filing.

South Plainfield market report · Homes for sale in South Plainfield · All NJ tax rates

Get Instant Price-Drop & New Listing Alerts in South Plainfield

Tell us when a South Plainfield home hits the market or drops in price. Free buyer alerts.

What's Your South Plainfield Home Worth in 2026?

Get a seller valuation for your South Plainfield home using recent sales and local tax data.

Questions about South Plainfield taxes

What is the property tax rate in South Plainfield, NJ?

The official 2025 general tax rate in South Plainfield (Middlesex County) is 7.316 per $100 of assessed value. The effective tax rate is 2.023 per $100 of market value.

What is the effective tax rate in South Plainfield?

South Plainfield's effective tax rate is 2.023. That rate already converts market value into an approximate tax bill. The general rate applies only to assessed value.

How much is property tax on a $500,000 home in South Plainfield?

Using the equalization ratio of 27.65%, a $500,000 market value is about $138,259 assessed. The approximate annual tax is $10,115, which is $500,000 times the effective rate of 2.023 per $100.

How do I appeal my South Plainfield property assessment?

Enter your South Plainfield address on this page. Garden State AI compares the assessment with recent sales under NJ Chapter 123 and, when the numbers support it, prepares the appeal packet.

Source: 2025 General Tax Rates, NJ Division of Taxation. Rates are not a legal opinion and do not include exemptions.