If you are a shareholder of record as of the close of business on a dividend Record Date (see KB47), you are entitled to receive the dividend on its Payment Date. While the actual dividend amount is not assured until the payment has been made by the issuer on the Payment Date, information deemed reliable is available such that IB will accrue the value of the dividend, net of any withholding taxes, on the Ex-Date. This information can be confirmed via the Daily Activity Statement posted to Account Management. The details of the accrual will be reflected in the statement section titled "Change in Dividend Accruals" and the net amount in a line item titled "Dividend Accruals" under the "Net Asset Value" section. If you wish to see information regarding dividends that you held through the Ex Date but which have not yet been paid out, choose "Legacy Full" from the Statements drop down when launching your statement. This will include an additional section called "Open Dividend Accruals" which will give you information on any pending dividends.
Note that dividend accruals may be either a debit (if short and borrowing the stock on the Record Date) or a credit (if long the stock on the Record date). In terms of account valuation, the dividend accrual is included in Equity with Loan Value as well as equity for purposes of determining compliance with the Pattern day Trading rules. A dividend credit accrual does not increase Available Funds and can therefore not be withdrawn until paid. A dividend accrual which is a debit does reduce Available Funds to ensure that funds are available to meet the obligation when payment is due.