Representative Page

At the request of Nassau County Executive Laura Curran, ARC has agreed to provide a grace period for filing a grievance until Thursday, April 30th, 2020.

Below are forms for various practitioners of assessment review (AR), provided by the Assessment Review Commission (ARC).

All Representatives and Attorneys filing on any property as a representative, where you are not the owner, must register and obtain a representative number from ARC. . Please email for further information. 

ARC Representative Due Dates

February 21, 2020
Deadline for residential status change and processing any Consents to Change
March 2, 2020
Deadline for commercial status change and processing of Consents to Change
March 2, 2020
Last day to file Grievances

Forms For Attorneys and Other Representative
 Adobe Acrobat format (PDF)
Form AR 10 (PDF)
Authorization to Represent an Individual Taxpayer pdf
Form AR 20 (PDF)
Request for Information
Form AR 20 - Instructions (PDF) 
Residential Rent Roll Template (PDF)
Commercial Rent Roll Template (PDF)
Form AR 70 (PDF)
ARC Stipulation
Form AR 71 (PDF) 
ARC Residential Stipulation
Form AR 80- ARC Release (PDF)
ARC Stipulation Discontinuance (PDF)
Consent to Change Attorney Template (PDF)
 Bulk Upload layout and Specification  
Protest e-File Layout (PDF) (NEW for 2021/22)

Parcel Number Format (PDF)

Authorization Image File Specification (PDF)

AR20 Bulk Upload Layout and Specification
AR 20 e-file Layout

ARC AR20 Online Filing Procedures

AR20 Bulk Upload Attachments Naming Convention

AROW AR20 Filing Guide

Duplicate Applications for Correction filed in 2019 for the 2020-21 year  
(updated 8/28/18)
(PDF -171kb)

2019/20 Form AR20 Submission Log (Non-Class 1 Applications)
(updated 10/11/18)
(.xlsx format -513 kb)

The attached spreadsheet lists applications by appeal number that ARC has received AR20 forms for the 2019/20 tax year. This list is compiled for the sole purpose of allowing representatives and prose applicants to identify which appeals ARC has received AR20’s for. ARC makes no representation that the AR20’s received for the appeals on this list comply with ARC’s rules of procedure or with the Real Property Tax Law.