After hours trading with margin

Hi, from the documentation about margin trading, The rate is charged only on your account’s end of day (overnight) debit balance [...] In other words, this allows you to make use of the additional buying power for intraday trading without any cost., does it mean I can close a position with margin during after hours market without any maintenance fee/commission? i.e are the margin calls/rates decided when the regular hours market close or after-hours market close?

@Vincent The cutoff time for calculating ‘borrowed funds’ is 20:00 ET (when normal extended hour trading is over). If a position is closed in after hour trading it won’t incur margin interest for that day.

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