What should I write as income tax on the NY IT 201-V check voucher?
The amount on the NY IT 201 line 80. The tax you owe plus penalties and interest estimated in following the instructions for lines 81 and 82. Those two amounts may be zero. If not zero, then by adding your estimate of the penalties and interest to what you pay with the payment voucher, you stop the clock on interest charges. New York will check your work. If correct, the matter is done. If your estimate does not cover the full penalty and interest charges, you will be billed with more interest assessed. If your estimate is too high, you can read the instructions to find out how they handle the refund.