What closing price of my short stock is used for calculating daily short stock interest?

You cannot simply use cash received from a short sale to meet the margin requirement for a new order in your account. A short stock sale is a margin transaction in which the account holder is borrowing stock rather than cash. While the proceeds from the short sale are credited to the cash balance of the account, these funds must be posted with the lender of the shares as collateral to secure their return. As a result, and in recognition of the fact that the loan transaction is subject to its own financing terms, the cash collateralizing the loan is excluded for the purpose of determining whether a margin loan exists…

The collateral amount underlying the security loan via the Stock Yield Enhancement Program and used for determining interest payments is calculated using standard industry convention. In the US market, the closing price of the stock is multiplied by 102% and then rounded up to the nearest whole dollar. The collateral is marked-to-market daily and the activity will be displayed on your statement…

A Long stock position has to be held more than a one year period before a closing trade would be considered a Long Term profit gain or loss.  If you sold a long stock position that you owned for less than one year it would be considered a Short Term gain or loss.  Any Short stock position you hold is borrowed therefore it is always considered to be a Short Term Gain or Loss regardless of when it was opened and then closed…

The cash collateral underlying the security loan from the Stock Yield Enhancement Program and used for determining interest payments is determined using standard industry convention whereby the closing price of the stock is multiplied by 102% and then rounded up to the nearest whole dollar. For example, a loan of 100 shares of a stock which closes at $59.24 would be equal to $6,100 ($59.24 * 1.02 = $60.4248; round to $61, multiply by 100)…