CBT-160-B: Underpayment of Estimated Corporation Business Tax on Gross Receipts of $50,000,000 or more (2025)
New Jersey · NJ Division of Taxation · Used for tax years 2025
Form CBT-160-B helps corporations with total gross receipts of $50 million or more determine whether they paid enough estimated New Jersey Corporation Business Tax. It calculates installment underpayments, checks exceptions to underpayment interest, and determines any installment
Who files this form
Corporations with total gross receipts of $50 million or more should use Form CBT-160-B. This includes separate and combined filers.
The form determines whether you paid enough estimated Corporation Business Tax and whether you owe interest for underpayment. Submit it with Form CBT-100, CBT-100S, or CBT-100U if you use it to calculate underpayment interest or show that you qualify for an exception.
When it's due
For the 2025 tax year, the estimated tax installment dates are the 15th day of the fourth, sixth, and 12th months of your tax year.
Underpayment interest runs from the installment due date until the payment date or the 15th day of the fifth month after the close of the 2025 tax year, whichever is earlier.
Submit CBT-160-B with your tax return. The text does not give a separate filing deadline for this form.
What you'll need
Have the following information available:
- Your name as shown on the return, Federal ID Number, and Unitary ID Number, if applicable.
- Your 2025 return: page 1, line 6 of CBT-100, line 4 of CBT-100S, or line 5 of CBT-100U.
- Your 2024 return, using those same line references for the prior year's tax.
- Estimated tax payment and credit amounts, installment dates, and payment dates.
- If claiming an exception, the prior-year return facts or the tax information for the months used in the annualized-tax calculation.
- If calculating interest, the applicable interest rates published on the Division of Taxation's website.
How to file
- Complete Part I, lines 1–9, to check for an underpayment in each of the three payment periods.
- If line 9 shows an underpayment, complete Part II to check whether an exception applies.
- If neither exception applies for a payment period, complete Part III, lines 13–18, to calculate interest.
- Enter the total interest from line 18 on page 1, line 12 of CBT-100 or CBT-100S, or page 1, line 14 of CBT-100U.
- Submit CBT-160-B with your CBT-100, CBT-100S, or CBT-100U.
Banking and financial corporations are subject to electronic filing requirements for all tax filings and payments for privilege periods ending on or after July 31, 2023. The instructions direct these corporations to the Division's website for more information.
The text does not provide a mailing address.
Common mistakes
- Carrying forward too much overpayment: On line 7b, enter only the overpayment on line 9 that exceeds the total of all earlier underpayments.
- Using a short prior-year period without annualizing it: For Exception I, divide taxable net income by the number of whole months covered by the short-period return, then multiply by 12.
- Combining multiple payments into one interest calculation: If you made more than one payment for an installment, include a separate computation for that installment.
- Ignoring partial months or rate changes: A part of a month counts as a full month for interest. Changes in the average predominant prime rate must be reflected in the calculation.
Questions people ask
Does an underpayment always mean I owe interest?
No. You do not owe interest for a payment period if your payments were made on time and equal or exceed either exception amount calculated for that period in Part II.
What exceptions are available?
Exception I uses the facts and applicable law from the prior-year return with current-year tax rates. Exception II uses annualized tax for the months preceding an installment date.
How are the required installments divided?
Line 6 uses 25% of line 4 for the first installment, 50% for the second, and 25% for the third.
What interest rate applies?
The annual rate is 3% above the average predominant prime rate. Interest is imposed for each month or fraction of a month that the underpayment exists. The Division publishes its assessed interest rates on its website.