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Are you sure it was a late filing penalty or a late payment penalty or both ? https://www.state.nj.us/treasury/taxation/pdf/current/630.pdf
You must file this NJ-630 application if:
1. You are applying for an extension of time to file a New Jersey Income Tax return but you are not applying for a federal extension; or
2. You are applying for both a federal and a New Jersey extension and are required to remit payment to the New Jersey Division of Taxation by the original due date of the return in order to have at least 80% of your actual tax liability
(as calculated on your New Jersey Income Tax return when filed) paid.
You do not need to submit this NJ-630 application if:
1. You have paid at least 80% of your final tax liability by the original due date, and
2. You have applied for an automatic extension of time to file for federal purposes and you enclose a copy of the federal Application for Automatic Extension (if filed by paper) with the final New Jersey return when filed.
