The "calculate" button does not work for Tax Underpayment NJ-2210.
You have to choose "Reduce Interest".
When it asks you "would you like to see if annualizing your income can ..." you can choose "No" and the interest will be added to your NJ-2210 and your 1040
So bottom line, the "calculate" button does not work. It also did not work two years ago because I got a hefty bill from NJ with two years of interest so now I always double check.
