Warren County, New Jersey, features varied property tax rates across its municipalities, with areas like Vienna reaching high effective rates of 3.51%. As part of a state known for above-average property taxes, Warren County’s rates depend on local, school, and county budgets. Homeowners should consult the Warren County Board of Taxation for accurate assessments. Our Warren County tax calculator helps residents estimate property taxes efficiently and plan their finances.
Warren County Tax Estimator (2025)
Estimator uses 2025 Warren County effective tax rates. Credits are placeholders.
Warren County Property Tax Due Dates
Property taxes in Warren County, New Jersey, are due quarterly with a 10-day grace period. Payments must be received by the Tax Office on time to avoid interest and penalties.
| Quarter | Due Date | Grace Period Ends |
|---|---|---|
| 1st Quarter | February 1 | February 10 |
| 2nd Quarter | May 1 | May 10 |
| 3rd Quarter | August 1 | August 10 |
| 4th Quarter | November 1 | November 10 |
Penalties and Interest for 2026
Late payments in Warren County accrue interest from the original due date. Interest is 8% per year on the first $1,500 and 18% on amounts above $1,500. A 6% year-end penalty applies to delinquent balances over $10,000. Properties with unpaid taxes may also face a tax sale, so timely payments are essential.
Warren County Property Tax Calculator
Our Warren County property tax calculator helps homeowners estimate annual property taxes based on appraised values, municipality, property type, and available credits. Users can see how assessed values and credits affect their total tax liability easily.
How the Calculator Works
The calculator uses your appraised/market value, chosen municipality, and property type to determine the estimated property tax. For example, a $100,000 residential property in Bass River Township will be assessed according to local rates, school, and county budgets. This step shows the tax before any credits or exemptions.
Understanding Assessed Value
In Warren County, the assessed value is the portion of your property’s market value used to calculate taxes. Typically, municipalities apply a ratio to the market value; for example, a $100,000 home might have an assessed value of $100,000, which forms the basis for calculating local, school, and county taxes.
Applying Credits and Exemptions
Our calculator also factors in credits like the Owner-Occupancy Credit (2%) and homestead exemptions. For instance, if a property qualifies as owner-occupied, the calculator deducts 2% from the total tax, showing how credits can lower your annual property tax obligation efficiently.
2025 Warren County, New Jersey Property Tax Rates by Taxing District (applicable for 2026)
The 2025 Abstract of Ratables for Warren County outlines how property tax rates vary by taxing district. These rates combine county, school, and municipal taxes, helping property owners understand how their total property tax is calculated across different municipalities.
County, Library, and Open Space Tax Rates
This table shows county-level tax components applied across Warren County municipalities, including county purpose, library funding, health services, and county open space taxes that support shared public services.
| Taxing District | County Tax | Library Tax | Health Service Tax | County Open Space Tax |
|---|---|---|---|---|
| Allamuchy Twp | 0.841 | 0.065 | – | 0.034 |
| Alpha Boro | 0.730 | – | – | 0.030 |
| Belvidere Town | 0.563 | 0.044 | – | 0.022 |
| Blairstown Twp | 0.734 | 0.057 | – | 0.030 |
| Franklin Twp | 0.673 | 0.052 | – | 0.027 |
| Frelinghuysen Twp | 0.651 | 0.050 | – | 0.026 |
| Greenwich Twp | 0.799 | 0.062 | – | 0.032 |
| Hackettstown Town | 0.650 | – | – | 0.026 |
| Hardwick Twp | 0.864 | 0.067 | – | 0.035 |
| Harmony Twp | 0.840 | 0.065 | – | 0.034 |
| Hope Twp | 0.791 | 0.061 | – | 0.032 |
| Independence Twp | 0.782 | 0.060 | – | 0.032 |
| Knowlton Twp | 0.923 | 0.071 | – | 0.037 |
| Liberty Twp | 0.812 | 0.063 | – | 0.033 |
| Lopatcong Twp | 0.652 | 0.050 | – | 0.026 |
| Mansfield Twp | 0.717 | 0.055 | – | 0.029 |
| Oxford Twp | 0.889 | 0.068 | – | 0.036 |
| Phillipsburg Town | 0.794 | – | – | 0.032 |
| Pohatcong Twp | 0.760 | 0.059 | – | 0.030 |
| Washington Boro | 0.994 | – | – | 0.040 |
| Washington Twp | 0.767 | 0.059 | – | 0.031 |
| White Twp | 0.726 | 0.056 | – | 0.029 |
School Tax Rates by District Type
School taxes make up a major portion of property taxes in Warren County. Depending on location, properties may be subject to district, regional, or local school tax rates.
| Taxing District | District School Tax | Regional School Tax | Local School Tax |
|---|---|---|---|
| Allamuchy Twp | 1.832 | – | – |
| Alpha Boro | 1.754 | – | – |
| Belvidere Town | 1.749 | – | – |
| Blairstown Twp | 1.012 | 1.004 | – |
| Franklin Twp | 1.019 | 1.001 | – |
| Frelinghuysen Twp | 0.910 | 0.866 | – |
| Greenwich Twp | 2.343 | – | – |
| Hackettstown Town | 2.071 | – | – |
| Hardwick Twp | 1.044 | 1.184 | – |
| Harmony Twp | 1.402 | – | – |
| Hope Twp | 2.160 | – | – |
| Independence Twp | – | 2.294 | – |
| Knowlton Twp | 1.577 | 1.165 | – |
| Liberty Twp | – | 2.336 | – |
| Lopatcong Twp | 1.669 | – | – |
| Mansfield Twp | 0.942 | 1.124 | – |
| Oxford Twp | 3.094 | – | – |
| Phillipsburg Town | 1.924 | – | – |
| Pohatcong Twp | 2.016 | – | – |
| Washington Boro | 1.503 | 1.713 | – |
| Washington Twp | 1.149 | 1.309 | – |
| White Twp | 1.562 | – | – |
Municipal Taxes and General Property Tax Rate
Municipal purpose, open space, and library taxes vary widely by township and directly impact the final general tax rate paid by property owners in Warren County.
| Taxing District | Municipal Purpose Tax | Municipal Open Space Tax | Municipal Library Tax | General Tax Rate |
|---|---|---|---|---|
| Allamuchy Twp | 0.435 | 0.020 | – | 3.227 |
| Alpha Boro | 0.889 | 0.040 | 0.042 | 3.485 |
| Belvidere Town | 0.924 | – | – | 3.302 |
| Blairstown Twp | 0.258 | 0.039 | – | 3.134 |
| Franklin Twp | 0.357 | – | – | 3.129 |
| Frelinghuysen Twp | 0.335 | 0.020 | – | 2.858 |
| Greenwich Twp | 0.776 | 0.040 | – | 4.052 |
| Hackettstown Town | 0.688 | – | 0.042 | 3.477 |
| Hardwick Twp | 0.602 | 0.029 | – | 3.825 |
| Harmony Twp | 0.324 | – | – | 2.665 |
| Hope Twp | 0.400 | 0.022 | – | 3.466 |
| Independence Twp | 0.627 | – | – | 3.795 |
| Knowlton Twp | 0.479 | 0.019 | – | 4.271 |
| Liberty Twp | 0.393 | 0.019 | – | 3.656 |
| Lopatcong Twp | 0.615 | 0.030 | – | 3.042 |
| Mansfield Twp | 0.676 | 0.020 | – | 3.563 |
| Oxford Twp | 0.740 | – | – | 4.827 |
| Phillipsburg Town | 1.748 | 0.020 | 0.157 | 4.675 |
| Pohatcong Twp | 1.620 | 0.050 | – | 4.535 |
| Washington Boro | 1.575 | – | 0.065 | 5.890 |
| Washington Twp | 0.775 | 0.020 | – | 4.110 |
| White Twp | 0.227 | 0.020 | – | 2.620 |
Warren County, New Jersey Property Tax Rates (2025)
This PDF provides a complete breakdown of 2025 property tax rates for Warren County, New Jersey. It covers all taxing districts and explains county, school, and municipal tax components, helping homeowners, investors, and researchers compare general tax rates accurately across municipalities.
Conclusion
Warren County property taxes vary widely by municipality, making accurate calculation essential for homeowners and buyers. By understanding assessed values, tax rates, due dates, and penalties, residents can plan better and avoid late fees. Our Warren County tax calculator simplifies the process by combining local, school, and county taxes into clear estimates, helping users make informed financial decisions with confidence.
FAQs
How are property taxes calculated in Warren County, New Jersey?
Property taxes in Warren County are calculated by multiplying a property’s assessed value by the total tax rate of the selected municipality, which includes county, school, and municipal taxes.
Do property tax rates differ by municipality in Warren County?
Yes, property tax rates vary significantly by municipality in Warren County because each town sets different budgets for schools, services, and local operations.
When are Warren County property taxes due?
Property taxes are due quarterly on February 1, May 1, August 1, and November 1, with a 10-day grace period for each payment.
What happens if I miss a property tax payment?
If payment is late, interest is charged from the original due date, and long-term delinquencies may result in penalties or a tax sale.
Can I reduce my property tax using credits or exemptions?
Yes, eligible homeowners may qualify for credits such as owner-occupancy or homestead benefits, which can reduce the total property tax owed.