To open position with instant buying power is interest-free.
If you are in a margin loan status while you get the instant buying power, the same amount as the instant buying power will be regarded as an interest-free loan which will be deducted from your total margin loan value counted for interest.
Everyone has access to no more than $1,000 instant buying power in total. Your limit of instant buying power can be increased to $10,000 if you have adequate net asset value in your account.
Instant buying power will be cleared once your deposit settles, or 7 days after the instant power was granted.
If the deposit is rejected by the bank while you are in use of the instant buying power. There will be a default record on your page, which will restrict the future instant buying power that may be granted.