Special rules apply to members of the Armed Forces of the United States and civilians providing support to the Armed Forces.
A person on active duty with the Armed Forces of the United States who cannot file timely because of distance, injury or hospitalization as a result of this service, will automatically receive a six-month extension by enclosing an explanation with the return when filed. Otherwise the normal rules apply. See Automatic Extension
Combat Zone Extension
New Jersey automatically extends the deadline for filing tax returns, paying taxes, filing claims for refunds, and the taking of other actions related to State income tax for individuals serving in the US Armed Forces and civilians providing support to the Armed Forces in a "combat zone" or a "qualified hazardous duty area." The deadline for filing returns, making payments, or taking any other action is extended for 180 days after the individual leaves the combat zone, or 180 days from the last day of any continuous qualified hospitalization for an injury sustained in the combat zone.
You may receive a six-month extension of time to file your New Jersey income tax return if at least 80% of your tax liability computed on your NJ-1040 or NJ-1040NR when filed is paid in the form of withholdings, estimated, or other payments by the original due date, and
You must also file Form NJ-630 if you are required to make a payment to satisfy the 80% requirement.
Civil union partners filing a joint return must either provide copies of the Federal extension application (or confirmation number) for both partners, or they must file Form NJ-630.
For more information on military personnel, see Tax Topic Bulletin GIT-7, Military Personnel