That assessment postcard might look harmless, but it can cost you thousands.

If your property was over-assessed, a New Jersey property tax appeal may be worth a closer look. First, the key distinction: in New Jersey, you are appealing the assessment (the value used to calculate taxes), not the tax bill itself. Morris County also notes that your current assessment is presumed correct, so you need credible evidence to support a lower value.

2026 NJ Property Tax Appeal Deadlines (Read This First)

For many homeowners, the regular filing deadline is April 1, 2026. If your town had a municipal-wide revaluation or reassessment, the deadline is typically May 1, 2026. Bergen County’s Board of Taxation specifically lists April 1, 2026 for non-revaluation towns and May 1, 2026 for revaluation/reassessment towns.

Also important: many county instructions state the deadline is April 1 or 45 days from the bulk mailing of the assessment notice (postcard), whichever is later, and the appeal generally must be received by the county board, not just postmarked.

Step-by-Step: What Comps to Pull Before You Appeal

A strong New Jersey property tax appeal usually starts with comparable sales. Morris County says the most credible evidence is comparable sales of similar property in your neighborhood.

Pull 3 to 5 sold properties that are:

• in the same town (ideally same neighborhood or similar school/market area)

• similar in style, age, square footage, lot size, and use

• sold close to the relevant valuation period

• in similar condition (updated vs. original matters)

Photos, property record cards, and notes on differences (finished basement, corner lot, renovations, etc.) can strengthen your case. Morris County also emphasizes proving true market value as of the October 1 pre-tax assessment date.

When It Is Worth Appealing

It may be worth appealing if your assessment appears clearly above what similar homes sold for, or if there are factual errors (size, features, condition) inflating value. It may be less worth it if your evidence is weak or the number difference is small. In some cases, no adjustment is made if the result falls within the common level range, and boards can even increase an assessment in certain situations.

What Happens After You File

The NJ Division of Taxation directs owners to file Form A-1 and the comparable sales form with the County Board of Taxation. After filing, a hearing is scheduled, and if you disagree with the county board’s judgment, you can generally appeal to Tax Court within 45 days.