2008? I found it was Jan 1, 2011.
I sold a stock I had since 1984. The 1099B broke it into Covered and Non-Covered shares. They weren't required to track the basis before Jan 1, 2011. Before then you have to figure out the cost yourself.
See this article, under….What investments are covered by the cost basis tax rules and when?
https://www.ameriprise.com/financial-goals-priorities/taxes/cost-basis-reporting
