An ACH credit is a push payment: an originator instructs its financial institution to send value to a receiver’s account. Payroll, vendor payments and some account-to-account transfers can use this path, which separates the payment instruction, batch clearing, interbank settlement and customer posting into connected but distinct stages.
The originator creates a credit instruction
A person, business or government entity provides the receiver’s account information, amount, timing and payment purpose through its bank or a service provider. The originator’s agreement and the type of entry determine the authority, formatting and processing rules that apply.
The originating depository financial institution, or ODFI, authenticates the originator and applies account, limit, fraud and required compliance controls. It also checks that required fields and the Standard Entry Class code are suitable before accepting the entry for the ACH Network.
The ODFI builds and releases a batch
ACH entries are commonly assembled into files and batches with control totals that help confirm completeness. The ODFI or its processor validates the file, applies an effective date and sends it to an ACH operator within an available processing window.
Release does not mean that the receiver has already been paid. It means the ODFI has accepted responsibility for an entry and transmitted a structured instruction into a system that will sort, clear and settle it according to network rules.
The ACH operator sorts entries for receiving banks
The ACH operator reads routing information, separates the file by receiving depository financial institution, or RDFI, and delivers the applicable entries to each institution. It also calculates the net positions that participating institutions will settle for the processing cycle.
Standard ACH and Same Day ACH use defined schedules rather than one identical timeline for every entry. Submission time, eligibility, effective date, weekends, holidays and exception handling all influence when the next stage occurs.
Interbank settlement and customer posting are connected but distinct
At settlement, the participating institutions’ positions are reflected through their settlement accounts or arrangements. The RDFI then uses the received account information to post the credit to the receiver, subject to applicable availability requirements and the account’s status.
The RDFI may need to route the item to an exception process when the account is closed, the account number cannot be applied or another return condition exists. A network settlement entry therefore does not guarantee that every credit will remain posted to the intended customer account.
Returns, reversals and reconciliation preserve the record
If an entry cannot be accepted, the RDFI sends a return with an applicable reason code and trace information. A reversal is different: it is available only to correct a qualifying erroneous entry and does not erase a properly originated payment merely because the originator changed its mind.
The originator, ODFI and RDFI reconcile file totals, settlement amounts, account postings, returns and notices of change. Trace numbers and retained records help the institutions research where an entry moved and explain why its customer-facing status changed.
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