Is it determined from that tax year or this tax year if I was included in a class action lawsuit against an (previous employer for me) employer?

I recently found out about it when it was settled. This was for my employment back in, I believe, 1998-1999. What do I have to do about the taxes? Originally, it was supposed to be an award to be of approximately just under $11,000. However, only 73 per cent of the involved responded so the award will be higher. I just don't know how much. At that time I was single. I just want to be able to pay a majority of the tax when the money comes in and not have to worry about it later, if it will be owed from that long ago. Thank you.