Will all account balances be transferred at the same time with Brexit migration?

On the ex-dividend date for a cash dividend, IBKR will accrue the expected dividend to eligible accounts. The dividend will continue to accrue until the funds have been allocated by the clearing agent or depository. Upon receipt of the funds, IBKR will reverse the dividend accrual and post the dividend to the cash balance of the account…

The Interest Accruals section shows interest accruals for each currency held and are converted to your base currency using the conversion rates in effect at the time of the transaction. Interest is paid and charged once a month after each month's close. We accrue interest daily during the month. When interest is actually posted to the account, the daily accruals are reversed. Interest accruals are a balance sheet item and are included in the Net Asset Value (NAV) in Base Currency section of the statement. …

Yes, once a dividend is accrued it will be included in the account's Net Asset Value (NAV). The accrual will generally start on the Ex-Dividend date and will be reversed out of the Dividend Accrual and posted to the Cash Balance on the payment date. The NAV will be impacted on the ex-dividend date when the accrual is processed…

No. The accrual balance, whether dividend or interest, will continue to be reflected in the account in which it was calculated. Accruals are converted to Cash once the dividend payment date is reached and the dividend is allocated or in the case of interest during the first few days of the month after it was calculated…