What is an omitted assessment in New Jersey and how do I appeal it?

An omitted assessment corrects an assessor's oversight: it picks up property — or an improvement — that was taxable in a prior year but never placed on the tax rolls. Unlike an added assessment (mid-year new value), an omitted assessment reaches backward to capture value that was missed entirely.

Statutory basis. New Jersey provides two routes: the Omitted Assessment Law, N.J.S.A. 54:4-63.12 et seq. (a complaint to the county board), and the more common "omitted-added" procedure under N.J.S.A. 54:4-63.31 et seq. that lets the assessor place an omitted assessment on the added-assessment list. An omitted assessment can reach the current year and the prior tax year.

The deadline mirrors added assessments — December 1. The NJ Division of Taxation treats added and omitted appeals together: file Form AA-1 by December 1, and the appeals "are heard between the Dec 1 filing deadline and Jan 1" (Division guide).

Direct-to-Tax-Court threshold is $750,000. As with added assessments, "if the aggregate assessed valuation of the property exceeds $750,000, the appeal may be made directly to the Tax Court of New Jersey" (NJ Division of Taxation); otherwise the County Board of Taxation hears it.

What you can contest. Whether the property was in fact "omitted," the year(s) reached back, and the value assigned. Because an omitted assessment can produce a surprise multi-year bill, verify the assessor used the correct prior-year value standard (true value as of the relevant October 1 dates) and prorated correctly.

Why it appears. Common triggers are an improvement that was completed but never inspected, a parcel split or merger that fell through the cracks, or an exemption that was wrongly applied and later reversed. New owners sometimes inherit an omitted assessment for work the prior owner did — review the basis carefully before paying.