For online you just put in the amount and pay that, no paperwork is submitted. If you mail the payment, you need to send only the payment voucher and the check. You can figure your regular tax rate on all other income, then at 15% for capital gains tax. Keep in mind that to avoid ANY penalty, you simply need to make sure 100% (or 110%) of last year's tax has been paid. You can send any balance with the return and there will be no penalty.
You could have some underpayment penalty with New York as well, however if you do pay with the return it should be minimal penalty due to the short number of days paid late. Here are some links that may be helpful.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
