What are my dividend obligations on shares which are pre-borrowed for shorting?

Key dates relating to stock dividends are as follows:

• Declaration Date …

The Fee Rate represents the indicative rate (generally expressed as an interest rate) that the lender assesses to the borrower of the shares. This is the indicative borrow fee rate that clients will pay IBKR to short a stock. It is a debit from the account…

In most cases, IBKR will purchase new shares for the account the morning after the cash dividend has been paid to the account.

Please Note…

Your account was lending shares of stock on the stock’s dividend record date.  Instead of being paid a dividend, you were paid a Payment-in-Lieu of a dividend, or “PIL.” As a US taxpayer, you may experience adverse tax consequences from receiving PIL, instead of the dividend directly from the issuer, while shares were on-loan.  This payment is your compensation for potential adverse tax consequences, and is called a “Gross-Up.” …