ACH stands for "Automated Clearing House".  ACH is an electronic network used by banks and government agencies (e.g., IRS) to process financial transactions and transmit money via direct deposit. This process is different than a wire transfer (a faster, usually same-day transaction), and may take 1-2 business days to complete the transfer of funds from one bank to another. NOTE: Saturdays, Sundays and holidays are not considered business days.