When u write a check is the funds automatically withdrawn?

They are automatically and immediately withdrawn when the check is presented by the payee to the bank for payment provided that the funds are in the account to cover the check. Some merchants can convert the check to an Electronic Funds Transfer (EFT) with a check scanner at the register and the money will come from your account within seconds of presenting the check to the merchant. Other times, it takes about 1-2 business days.