New Jersey Personal Income Tax Extension – Federal Extension Plus 80% Payment
New Jersey grants a six-month automatic extension for filing personal income tax returns when two conditions are met: a valid federal extension through IRS Form 4868, and payment of at least 80% of New Jersey tax liability by April 15, 2026. Meeting both conditions moves the filing deadline from April 15 to October 15, 2026 and avoids the late filing penalty. The New Jersey Division of Taxation still charges late payment penalties on any unpaid balance above the 80%.
Two Conditions Required
Federal Extension + 80% Payment by April 15
New Jersey’s automatic extension requires a valid federal extension and payment of at least 80% of your NJ tax liability by April 15. Missing either condition means your return is due April 15.
High Filing Penalty
$100 Per Month + 5% of Unpaid Tax – Up to 25%
New Jersey’s failure-to-file penalty includes a $100 per month floor plus 5% of unpaid tax per month, up to 25%. This penalty is avoided by meeting both extension conditions. The failure-to-pay penalty – a flat 5% – still applies to any balance remaining after April 15.
80% payment avoids the filing penalty only: Late payment penalties and interest still apply to any New Jersey balance remaining after April 15, 2026 – regardless of extension status. Pay as much as possible by April 15 to limit exposure.
Using Form NJ-630
Form NJ-630 (Application for Extension of Time to File New Jersey Gross Income Tax Return) is used when mailing an extension payment. When filing your New Jersey return by October 15, include a copy of your federal Form 4868 or your IRS confirmation number to document your extension eligibility.
Late Filing and Payment Penalties
New Jersey’s failure-to-file penalty is $100 per month plus 5% of unpaid tax per month, up to 25% – one of the more aggressive penalty structures in the country. The failure-to-pay penalty is a flat 5% of unpaid tax and applies to any balance left after April 15, even under a valid extension. Both filing and payment penalties can apply simultaneously on a balance due.
Best Practices
- ✓File IRS Form 4868 by April 15 – New Jersey’s extension requires a valid federal extension.
- ✓Pay at least 80% of your NJ tax liability by April 15, 2026, to avoid the late filing penalty.
- ✓Pay as much as possible beyond 80% to minimize late payment penalties on the remaining balance.
- ✓Include your Form 4868 or IRS confirmation number when filing your NJ return by October 15.
New Jersey’s extension requires coordination on two fronts – federal approval and 80% payment by April 15. The $100/month filing penalty floor makes compliance especially important. Pay as much as possible, document your federal extension, and file your return by October 15, 2026.
Quick Reference Table
New Jersey State Tax Extension
