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What is the settlement and settlement mechanism of the US stock market?
The US stock market implements a T+2 delivery system, which means that the settlement and delivery are completed on the second trading day after the transaction occurs.

The US Securities and Exchange Commission announced that starting from September 5, 2017, the standard settlement time for securities traded on US exchanges will be shortened from 3 trading days (T+3) to 2 trading days (T+2). For details, please refer to the notice on the official website of the US Securities and Exchange Commission( https://www.sec.gov/oiea/investor-alerts-and-bulletins/ibsettlementcycle )

After shortening the settlement cycle, the funds obtained from selling stocks can be withdrawn from T+3 to T+2 in advance, accelerating the efficiency of capital turnover
If conducting financing or short selling transactions, the financing interest and short selling fees will be calculated from T+2.
Assuming that the settlement has been completed on T day (today), your account amount is 50000. You have purchased 30000 shares on T-1 and 20000 shares on T, so your outstanding settlement amount on T+1 is -30000 and on T+2 is -20000; To avoid settlement defaults in the next two trading days, the maximum amount you can withdraw today is 5-3-2=0