Choose the Correct Monroe Township Tax Office
New Jersey has two different Monroe Townships. Williamstown properties use the Gloucester County office at ZIP 08094, while properties billed from 1 Municipal Plaza use the Middlesex County office at ZIP 08831.
Select the county first, then use the matching official portal, phone number, address, payment rules, assessor records and appeal calendar.
Williamstown, NJ 08094
When Is Your
Next Tax Deadline?
Select your state — see your exact deadline, live countdown, and whether you’re on time or already accruing penalties.
856-728-9800, option 3 then 1
Property Tax Penalty & Interest Calculator
State-specific penalty rates • Interest accrual • Tax lien deadline • Cost-of-waiting breakdown
| Original Tax Amount | $0.00 |
| Initial Penalty— | $0.00 |
| Monthly Interest— | $0.00 |
| Fixed Fees— | $0.00 |
| Total Due | $0.00 |
Daily Accrual Rate
Interest and penalties are adding this much to your balance every single day
Tax Lien Warning
| If You Pay On | Days Late | Penalty | Interest | Total Owed | Extra Cost |
|---|
Monroe Township, NJ 08831
February, May, August and November
Both offices say postmarks are not accepted
Which Monroe Township is printed on your tax bill?
Use this route when the property is in Williamstown and the municipal office is at 125 Virginia Avenue, Williamstown, NJ 08094.
- Official site: monroetownshipnj.org
- Tax Collector: Joanna Potopchuk
- WIPP municipal code: 0811
- County Assessor handles assessments
Use this route when the tax office is at 1 Municipal Plaza, Monroe Township, NJ 08831.
- Official site: monroetwp.com
- Tax Collector: Alexandra Uhrig, CTC
- Portal: Edmunds GovPay / Monroe
- Township Assessor is in Room 105
Gloucester County Monroe vs Middlesex County Monroe
| Detail | Gloucester County / Williamstown | Middlesex County / 08831 |
|---|---|---|
| Municipal address | 125 Virginia Avenue, Williamstown, NJ 08094 | 1 Municipal Plaza, Monroe Township, NJ 08831 |
| Tax office phone | 856-728-9800, option 3 then 1 | 732-521-4405 |
| Published office hours | Monday–Thursday, 7:00 a.m.–5:00 p.m. | Monday–Friday, 8:30 a.m.–4:30 p.m.; confirm holiday changes |
| Official tax page | monroetownshipnj.org | monroetwp.com |
| Online portal | WIPP 0811 | EdmundsGovPay.com/Monroe |
| Assessment office | Gloucester County Assessor, 856-307-6445 | Township Tax Assessor, Room 105, 732-521-4400 |
| Regular due dates | Feb 1, May 1, Aug 1, Nov 1 | Feb 1, May 1, Aug 1, Nov 1 |
| Postmark rule | Postmarks not accepted | Postmarks not accepted |
Monroe Township NJ property-tax due dates and grace-period rules
Both offices publish a 10-day grace period. When the tenth falls on a weekend or holiday, the deadline may move to the next business day. A payment received after the valid grace date can trigger interest retroactive to the first day of the due month.
Both municipalities say postmarks are not accepted. Bank bill pay can create a paper check rather than an instant electronic transfer. The payment must reach and be received by the correct office.
Monroe Township Gloucester County Tax Collector office
Williamstown, NJ 08094
Phone: 856-728-9800, option 3 then 1
Monday–Thursday
7:00 a.m.–5:00 p.m.
Tax Collector: Joanna Potopchuk
Call before holiday, weather or deadline-day travel.
How to view or pay Monroe Township Williamstown taxes
Williamstown payment methods and mistakes to avoid
| Method | Official instruction | Practical check |
|---|---|---|
| Online / AutoPay | Use the township-linked WIPP portal; quarterly AutoPay scheduling is available through the link. | Confirm the exact property and final processor fee. |
| In person | The office accepts in-person payments and now accepts debit/credit cards. | Ask about the current card fee and obtain a receipt. |
| Cash | Cash is accepted; the township asks taxpayers to bring the exact amount. | Do not place cash in any drop box. |
| Inside drop box | Located inside Town Hall next to the Tax Collector’s Office. | Use a check or money order with property identifiers. |
| Outside drop box | Located at the main Virginia Avenue entrance. | Keep a copy and allow office processing time. |
| Bank bill pay | Allow 7–10 days for the payment to reach the office. | This may be a mailed check; no postmark protection applies. |
| Mail to the Tax Collector at 125 Virginia Avenue, Williamstown, NJ 08094. | Send early and identify the property on the check. |
Williamstown property-tax records, maps and official tax searches
Use for current property tax data, balance, bill and payment-status review.
Gloucester County’s coordination portal provides block/lot maps, address searches and MOD-IV property information.
The township warns that web data is not an official tax search. Official searches must be submitted to the Tax Collector in writing with a $10 check.
Gloucester County Assessor and appeal calendar
Assessment questions: 856-307-6445
Handles value, records, tax maps, exemptions and assessment administration.
Appeal help: 856-307-6448 or 856-307-6444
Hours listed Monday–Friday, 8:00 a.m.–4:00 p.m.
Monroe Township Middlesex County Tax Collector office
Monroe Township, NJ 08831
Phone: 732-521-4405
Tax Collector: Alexandra Uhrig, CTC
Monday–Friday
8:30 a.m.–4:30 p.m.
Confirm holiday closures before visiting.
Main Township phone: 732-521-4400
How to pay Monroe Township NJ 08831 property taxes
Middlesex payment fees and delivery rules
| Method | Published rule | Important detail |
|---|---|---|
| Credit card online | 2.95% fee | The fee is retained by the processor, not the township. |
| E-check online | $1.95 fee | Verify bank details and the final screen. |
| Free ACH direct debit | Enrollment form and voided check due at least 10 days before the quarterly due date | Debit occurs on the fourth and continues until written cancellation. |
| Bank bill pay | Allow 10 days for delivery | The bank may mail a check; postmarks are not accepted. |
| Check or money order to 1 Municipal Plaza | Payment must be received by the grace deadline. | |
| Drop box | Outside the front entrance; checks or money orders only | Do not place cash in the box. |
Late interest, returned payments and year-end penalty
| Rule | Official description | What to do |
|---|---|---|
| Application order | Delinquent payment is applied to interest first and then the oldest principal. | Ask for an exact payoff rather than paying an estimated quarter. |
| Interest | 8% on the first $1,500 of total delinquency; 18% thereafter. | Confirm the balance on the payment date. |
| 18% level | Once the account reaches 18%, it remains at that level until the entire account is current. | Ask whether a partial payment will leave the higher rate active. |
| Year-end penalty | The township states that delinquent current-calendar-year balances on December 31 are subject to a 6% year-end penalty. | Resolve a large delinquency before year-end when possible. |
| Returned payment | The payment is reversed and a $20 fee is charged. | Treat the tax as unpaid until replacement funds post. |
Monroe Township NJ tax records: which record do you actually need?
Tax Collector vs Tax Assessor in both Monroe Townships
| Your question | Correct office | Why |
|---|---|---|
| How much is due or did payment post? | Tax Collector | Maintains billing and payment records. |
| Why is interest or a returned-payment fee showing? | Tax Collector | Handles delinquency and collection status. |
| Is there a tax-sale lien or payoff? | Tax Collector | Initiates tax sales and confirms collection payoff. |
| Is the assessed value wrong? | Assessor / County Assessor | Values property and maintains the assessment roll. |
| Who owns the property in tax records? | Assessor / County Assessor | Maintains assessment ownership and property cards. |
| Do I qualify for a deduction or exemption? | Assessor / County Assessor | Reviews eligibility and applications. |
| How do I appeal the assessment? | County Board of Taxation | Receives and hears property-assessment appeals. |
Assessment questions: Gloucester County Assessor
How property-tax assessment appeals work
You cannot appeal the municipal budget or simply argue that the tax bill is too high. You appeal the property’s assessment and must provide evidence that the assessed value does not fairly represent true market value or the applicable common-level-range standard.
- Alternate assessment calendar.
- Regular appeals currently filed November 15 through January 15.
- January 15 deadline is 4:00 p.m.
- Added/omitted appeal deadline is December 1 at 4:00 p.m.
- General New Jersey appeal deadline is April 1.
- May 1 may apply when a municipal revaluation or reassessment has been implemented.
- Use the county’s 2026 forms, hearing schedule and filing instructions.
Evidence that helps an appeal
Common Monroe Township tax problems and the next action
ANCHOR, Senior Freeze, Stay NJ and local deductions
State relief programs are separate from the municipal payment deadline. A pending application normally does not permit a taxpayer to ignore the current local bill unless an official instruction specifically says otherwise.
New Jersey now presents ANCHOR, Senior Freeze and Stay NJ information through its property-tax-relief system.
General help: 1-888-238-1233
A $250 annual deduction may be available when statutory age, disability, income, residency and ownership rules are met.
Qualified veterans, surviving spouses and totally disabled veterans may have separate deduction or exemption routes and documentation requirements.
Before entering bank or card information
Monroe Township tax-office maps
Gloucester County: 125 Virginia Avenue, Williamstown, NJ 08094. Tax office hours are listed Monday–Thursday, 7:00 a.m.–5:00 p.m.
Middlesex County: 1 Municipal Plaza, Monroe Township, NJ 08831. The tax office listing shows Monday–Friday, 8:30 a.m.–4:30 p.m.
Official Monroe Township and county resources
Monroe Township NJ Tax Collector FAQs
Which Monroe Township NJ Tax Collector do I need?
Use the Gloucester County office when the property is in Williamstown or the bill shows 125 Virginia Avenue, Williamstown, NJ 08094. Use the Middlesex County office when the bill shows 1 Municipal Plaza, Monroe Township, NJ 08831. Match the county, ZIP code, property address, block and lot before paying.
How do I pay Monroe Township Gloucester County property taxes online?
Open the official Monroe Township Gloucester County Tax Collector page and follow its Pay or View Taxes Online link to the WIPP 0811 portal. Verify the owner, property location, block, lot, qualifier, account and quarter before paying. Save the confirmation and check that the payment posts.
How do I pay Monroe Township Middlesex County property taxes online?
Use the official Monroe Township Middlesex County Tax Collector page or its Edmunds GovPay portal. Search the property account, confirm the owner, block, lot, tax year and quarter, review the fee and save the receipt. The official page lists a 2.95% card fee and a $1.95 e-check fee.
What are the Monroe Township Williamstown Tax Collector hours?
The Gloucester County office at 125 Virginia Avenue, Williamstown, NJ 08094 lists Monday through Thursday hours from 7:00 a.m. to 5:00 p.m. Call 856-728-9800, option 3 and then 1, before a holiday or deadline-day visit.
What are the Monroe Township NJ 08831 Tax Collector hours?
The Middlesex County tax office and payment listing show Monday through Friday hours from 8:30 a.m. to 4:30 p.m. The office is at 1 Municipal Plaza, Monroe Township, NJ 08831, and the Tax Collector phone number is 732-521-4405.
When are Monroe Township New Jersey property taxes due?
Both municipalities use the standard quarterly due dates of February 1, May 1, August 1 and November 1, with a local 10-day grace period that may move to the next business day when the tenth falls on a weekend or holiday. Both offices warn that postmarks are not accepted.
What is the 2026 Gloucester County Monroe Township August tax deadline?
The official page, updated July 30, 2026, says property tax bills will be mailed during the week of August 17 and that the last day to pay the August quarter is Monday, September 14. Recheck the official page because this is a special 2026 notice.
How do I find Monroe Township NJ property tax records?
Use the correct municipal WIPP or GovPay portal for balances, bills and payment status. Gloucester County also links to taxmaps.info for maps and MOD-IV records, but the township warns that online data is not an official tax search. Official Gloucester tax searches require a written request and fee.
Should I contact the Monroe Township Tax Collector or Tax Assessor?
Contact the Tax Collector for bill payment, balances, receipts, delinquent interest, returned payments, bank codes, tax sale and posting questions. Contact the Assessor or County Assessor for assessed value, ownership records, deductions, exemptions, property record cards, tax maps and assessment appeals.
How do property-tax appeals differ in Gloucester and Middlesex Counties?
Gloucester County follows an alternate calendar and currently lists an appeal period from November 15 through January 15, with filing due by 4:00 p.m. on January 15. Middlesex County generally follows the April 1 deadline, or May 1 when a revaluation or reassessment applies. Use the current county instructions and file early.