I received a 601B REV 05/20 from NJ saying that I own 148.12, after I filed and paid NJ state income tax via TurboTax. This installment interest was charged because they said I did not make the required estimated payments.
A few questions:
1) Why didn't Turbotax include this in my NJ amount due?
2) I work in NY and I got a refund NY, similar to what I had to pay to NJ. Do I still need to make estimated payments during the year?
3) How do I calculate how much I have to pay in estimated payments over the year?