What is an ACH transfer?

US Automated Clearing House (ACH) Transfer Initiated at IBKR: A request for IBKR to transfer funds through the ACH network. Initiation of an ACH transfer enables you to automatically deposit funds from a US bank to IBKR. You will be required to enter your bank's ABA number and your bank account number. If you do not know your bank's ABA number, you can enter the bank name and city and search for the correct ABA number. You will be required to verify each new instruction. ACH deposits received before 2:00 PM EST are subject to a 4-business-day hold; deposits received after the cutoff will be subject to a 5-business-day hold period. Though funds may be released earlier at IBKR's sole discretion (depending on tenure, deposit history and account balance), IBKR does not provide any guarantees of the accelerated provision on all ACH deposits.

If funds are withdrawn to a bank other than the originating bank, a 44-business day withdrawal hold period will be applied.  Client must have two-factor authentication enable in order to connect their bank via ACH.

Brokers receiving ACH funds transfer to portfolio margin accounts will not have the funds credited to the account until the funds are settled. If you seek immediate use of funds in your portfolio margin account, you may wish to consider a wire transfer.

Additional Information

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What is the credit hold period for ACH deposits?
How do I send money via an ACH transfer?
How to initiate ACH transfers
What are Direct ACH Transfers/Direct Debits?