State Tax Day - Current, S.5, New Jersey—Multiple Taxes: Assessed Interest Rate on Outstanding Balances for 2026 Announced, (Dec 17, 2025)
New Jersey issued guidance on the assessed interest rate for outstanding tax balances for the calendar year 2026. Effective January 1, 2026, the interest rate is 10%. The rate is calculated as the prime rate of 7% plus 3%.
Technical Bulletin TB-21(R), New Jersey Department of Taxation, December 16, 2025, ¶402-683
Other References:
Explanations at ¶89-204