Thank you very much, I think the statement on that form you pointed to was the clear confirmation I was looking for. I will just use the date of the payment as the "sale date" and the excess above the cost basis as the proceeds.
I had tried to post a more detailed version of the question that got marked as spam for some reason, but the point about being sure on the cost basis is also something I am trying to figure out. These stocks were acquired through a couple of "transactions", so there is also a chance my Cost Basis isn't accurate. I originally was given stock options, which I exercised and purchased the stock. There was then some corporate reshuffling where my Class B stock was converted into Class A stock and Class B stock, and I was given the chance to buy additional Class B stock. In the "conversion", almost all of the capital of my original stock value was applied to the new Class A stocks that were issued, with the exception of $0.10/share for Class B, and the additional Class B stock was also made available at $0.10/share.
Since the dividend payment in this case was only on Class B stock, I am assuming my cost basis was $0.10/share.
