And Congress is likely soon to require brokers to report to the Internal Revenue Service and to you not just the grossproceedsof securities sales (as they do now on form 1099-B) but also your cost basis.
In coming years, brokers and banks will likely have to report to the Internal Revenue Service (and to you) not just the grossproceedsof your stock and mutual fund sales (as they do now), but also what you paid for those shares.