Did you get the Form 1099-G from New York State for your 2017 refund? The amount you report on your 2018 federal tax return should be the amount shown in box 2 of your 1099-G. That might be different from the refund that you actually received. Go to the following link on the New York State Department of Taxation and Finance web site for a list of reasons that the amounts might differ.
https://www.tax.ny.gov/pit/file/1099moreinfo.htm
New York does not mail Form 1099-G. You can get it at the following link on the Department of Taxation and Finance web site.
https://www.tax.ny.gov/pit/file/1099g.htm
