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This has happened to me (and to plenty of others) for many years. Could be many different reasons, either with TT or Schwab. The best advice I can give right now is log out of TT, then log back in to see if it shows up. Or, wait until tomorrow and try again. Since Schwab won’t have produced 1099s for all their accounts until end of the month, it may be that they are waiting til then to make 1099 downloads available.