The NYS household credit is a maximum of $75 and your combined income must be less than $32,000. If your income is more than that, you aren't eligible no matter what you enter for your spouse. If your income is less than that but you know that your combined incomes will be more than $32,000, you can enter any amount that will make your combined income more than $32,000 so you don't claim the credit. If you think that you and your spouse combined make less than $32,000, you have a problem; if you enter zero, or guess too low, you will get too much credit and will probably have to pay it back once your spouse files their tax returns and NY gets around to comparing them. If you guess too high, you may be giving up a few dollars of the credit. I can't suggest an amount you should claim in that situation.
