Mercer County Library System

We are committed to providing the materials and services that satisfy the educational, informational, recreational, and cultural needs of our diverse community, and strive to encourage a lifelong interest in reading.

Tax Assistance Information

IRS Online Tax Help

IRS has several online resources to help taxpayers.

Printed Tax forms available at MCLS

The 2020 1040, 1040-SR and instruction booklets are available for pickup. Check your local branch to see if the binder of reproducible forms (schedules) is available. We are also able to print other forms from the IRS website ($0.10 a page).

AARP Tax Assistance

Because of the COVID-19 pandemic, the in-person AARP Foundation Tax-Aide Program will not be offered this tax season at any site in Mercer County. However, AARP is offering an alternative this year called the AARP Alternative Tax Preparation program (ATP).

This program provides direct taxpayer access to free online tax software for this year’s taxes as well as video and/or phone assistance with a certified AARP tax assister. Rather than doing the tax return for the taxpayer, the certified AARP tax assister helps the taxpayer prepare his/her own online return.

Starting on January 22, 2021 you can get more information about the Alternative Tax Preparation program at

We all certainly hope that next year, when we are all safe from the COVID-19 pandemic, we and the AARP Foundation Tax-Aide Program will be able to prepare tax returns at this Site as we have in the past.

AARP Tax-Aide Site Locator

AARP Foundation Tax-Aide provides virtual and in-person tax assistance free of charge, with a special focus on taxpayers who are over the age of 50 or have low-to-moderate income. Use the search function below to find out the status of a site near you:

In New Jersey (County-by-County)

Need Help? Start Here! NJ 211

Locations in Mercer NOT offering tax assistance this year

Arm in Arm
Boys & Girls Club of Mercer County
Boys & Girls Club of Trenton
Catholic Charities of Trenton
East Windsor Senior Center
Ewing Senior Center/Hollowbrook
Hamilton Senior Center
Hamilton Township Free Public Library
Lawrence Senior Center
Mercer County American Legion
The College of New Jersey
Mercer County Connection
Mercer County Hispanic Association
Mercer Street Friends
Nassau Presbyterian Church
Princeton Public Library
Princeton Senior Resource Center
Rider University
Robbinsville Senior Center
RWJ Fitness & Wellness Center
West Windsor Senior Center

Federal Forms

The following are links to select resources. For a more guided resource, navigate to Internal Revenue Service – Filing

Form 1040

US Individual Income Tax Return
Annual income tax return filed by citizens or residents of the United States.


Form 1040-ES

Estimated Tax for Individuals
Form 1040-ES is used by persons with income not subject to tax withholding to figure and pay estimated tax.

Physical Copies

Our branches supply copies of the 1040 and 1040-SR forms along with instructions on how to fill them out.

New Jersey Forms

The following are links to select resources. For a more guided resource, navigate to NJ Department of Taxation – Completing and Filing A Return NJ Income Tax – Important Changes for 2020

Amended Return


Form NJ-1040 X (.pdf)


File Form NJ-1040NR and write the word “Amended” in bold letters in the upper right hand corner.


Physical Copies

Recieve Forms by Mail

Call 1-609-826-4400 or 1-800-323-4400.

Pick Up Forms

The nearest Regional Service Center, which is in Trenton, has paper copies. It is located at the Taxation Building, 50 Barrack Street Trenton, NJ 08695.

Mail Returns

The return address is different depending on residency and return. Check the NJ Divison of Taxation – Where to Mail Your Return webpage.

Taxation Sites by State