If an ACH deposit is returned by the sending bank in the future, and, prior to the return, the account has either bought or sold securities, is the account subject to restrictions?

Yes. If an ACH deposit is returned by the sending bank, and the reversal results in an Intraday Margin Deficit (IMD), this will be counted an an instance of not satisfying an IMD as promptly as possible, even if the deficit is later resolved.

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What happens if I do not satisfy an Intraday Margin Deficit (IMD)?
Can my account receive credit for a pending deposit if my account is subject to the 90-day restriction?
Is my account still subject to the IMD requirements if the deficit was caused by fraudulent activity?
If I deposit funds to meet an Intraday Margin Deficit (IMD), how long are my funds required to be in the account?