What is an Intraday Margin Deficit (IMD)?

An Intraday Margin Deficit (IMD) is defined as the largest maintenance margin deficiency with respect to any excess liquidity reducing transaction in a margin account during a given trading day.

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Can a deposit on the same day as the Intraday Margin Deficit (IMD) reduce or preempt the IMD call?
When will Intraday Margin Deficit (IMD) calls be issued?
What transactions could create an Intraday Margin Deficit (IMD)?
Can excess in another account be used to meet my Intraday Margin Deficit (IMD)?