I called the New York State Department of Finance and they said that I'm getting a $18.52 refund. (That's the exact amount of my dispute.) I asked them what the error was, and the man did the computation while I was on the phone and he said that it came out exactly as shown on my return, as done by TurboTax. He said that a notification letter will be mailed out to me next week, and it will explain what the error was. Since I'm getting a full refund, obviously it's their error.
I'll let you know what the letter says when it arrives.
