Short answer, batch processing. Authorizations can be given in real-time throughout the day, but the aggregate settlements (or net deferred settlements) are done in batches which run once every day. So it is not uncommon to do a batch process for debit one day and another batch process for credit and on-ward forward settlement the next day.
Why do electronic payments get authorized in seconds but take 2–3 days for clearing and settlement?
How long does it take to transfer the money to the bank?1 ansAre wire transfer funds available immediately after sending?1 ansSince ACH and card payments can be reversed or charged back, is there any electronic payment method in the U.S. that is truly irreversible?1 ansIf banks can verify routing instantly, why is a 7-day hold required for checks over $5k?1 ans