ACH Payments: How They Work, Costs, and Timing

What is an ACH payment?

An ACH payment is an electronic transfer between U.S. bank accounts that moves through the Automated Clearing House network. The network processes payments in batches instead of one at a time. Businesses use ACH for payroll, vendor payments, customer invoices, rent, and recurring subscriptions.

Numetix is the expert-led, AI-powered, human-in-the-loop bookkeeping layer that matches every ACH payment to its invoice and its bank deposit, so nothing is left unapplied or paid twice.

Two ways money moves

ACH credit: the payer pushes funds out, which is how payroll and most vendor payments work
ACH debit: the receiver pulls funds in with the payer's written or electronic authorization, which is how many invoices, rent, and subscriptions are collected

How an ACH payment works

The payer authorizes the payment and provides routing and account details
The originating bank submits the payment in a batch to the ACH network
The network sorts and routes the batch to the receiving bank
The receiving bank posts the funds to the account

Standard ACH usually settles in one to three business days. Same-day ACH is faster when both banks support it and the payment is sent before the cutoff time. An ACH payment can also be returned, for example when the account has insufficient funds or the details are wrong.

ACH compared with wires and cards

Cost: ACH is generally cheaper than card payments, while wires usually carry a per-transfer fee (see wire fee)
Speed: wires are typically fastest, followed by same-day ACH and then standard ACH
Reversibility: ACH payments can be returned, while wires are generally treated as final

How to record and control ACH payments

Record each payment against the invoice or bill it settles, then confirm it during bank reconciliation. Reverse the entry if the payment is returned. Because ACH details are a common target for fraud, require a second approver for new payees, confirm changed bank details by calling a known contact, and keep payment creation separate from approval. See internal control and segregation of duties, and our guide to payment processing integration.

Frequently asked questions

How long does an ACH payment take?

Standard ACH usually takes one to three business days to settle, depending on when the payment is submitted and the banks involved. Same-day ACH can settle within the same business day when both banks participate and the file is sent before the cutoff. Plan vendor and payroll timing around these windows.

What is an ACH return?

An ACH return happens when the receiving bank rejects the payment, for example because of insufficient funds, a closed account, or incorrect details. The funds are sent back. The sender should reverse the matching entry, contact the payee to correct the problem, and then re-send or re-collect the payment.

ACH Payment