What is ACH credit and how does it work?

A complete guide to what ACH credit transactions are, how they work, and how they’re different from ACH debits.

October 07, 2021

Tom Sullivan Pic
Tom Sullivan

Tom is a fintech industry writer who creates whitepapers and articles for Plaid. His work has been featured in publications like Forbes, Fortune, and Inc. He's passionate about the freedom that the union between financial services and technology can create.

Most Americans receive an ACH credit two or three times a month without knowing they’ve done so. The ACH system is a great unsung part of America’s financial plumbing, and even frequent commercial ACH users can fall behind the pace of new solutions being built atop the underlying infrastructure.

Despite not being a household name, ACH credit payments are quietly ubiquitous. Often referred to by informal names matching popular uses cases (e.g., “direct deposit” and “peer-to-peer payment”), the ACH network powers tens of millions of credit transactions every day.

Source: Nacha

Impactful ACH credit usage statistics include:

  • 11.6 billion ACH credit transactions per year

  • $40.2 trillion in total value exchanged

  • 35 ACH credit transactions per person in the US

  • ~94% of Americans paid wages/salary by ACH credit

  • 11,000+ banks and credit unions in the US can receive ACH credit

What are ACH credit payments?

An Automated Clearing House (ACH) credit payment occurs whenever someone instructs the ACH network to “push” money from their account to someone else’s. 

This could be an employer (often via some processing partner) pushing payroll to their employees, or a government agency pushing payments to eligible citizens. It could also be a consumer digitally paying a bill, buying something online, or initiating a peer-to-peer transfer to a friend through a service like Venmo or CashApp.

ACH credits essentially move money from one bank account to another in an easy and inexpensive way—from as fast as a few hours to as long as a few business days—all with just a name, bank account number, routing number, and basic transaction details.

→ Ready for seamless ACH payments? Plaid Auth provides instant bank account authentication when users connect with their bank account credentials.

How do ACH credits work?

For the person sending funds, an ACH credit transaction is the digital version of a paper check. Instead of filling out a piece of paper for the payee to bring to their bank, the payer instructs the ACH network to move money between their accounts directly.

Here is how ACH credits work mechanically:

  • The payer or their processing partner gives an Originating Depository Financial Institution (ODFI), or it’s processing partner, the payee’s account information, the amount to be sent, a categorization code, and a target effective entry date.

  • The ODFI or an approved processing partner (often a Third-Party Sender) passes on these requests to the ACH network in periodic batches.

  • Six times each business day, the ACH network breaks down these incoming bundles into individual messages (transactions) and rebundles them into new batches for immediate delivery to each Receiving Depository Financial Institution (RDFI) that holds payee accounts.

  • Each RDFI then imports their incoming batches into their system, executes all the transactions they can based on the processing window requested, and sends back any return codes with their next regular batch.

  • If no return code is received within the required timeframe, the ODFI and RDFI settle the transaction using their balances at the Federal Reserve.

  • Funds for settled transactions are then released by the RDFI to the payee. 

Depending on when the first messages are sent and/or whether the ODFI pays the extra fee for same-day processing, it generally takes one to two business days for credits to reach payees. 

For more on timelines, see our in-depth guide on how an ACH transfer works.

A Modern Guide to ACH

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What’s an ACH credit refund?

While all ACH credit transfers are meant to be definitive, certain mistakes require that a refund be issued. The National Automated Clearing House Association (Nacha), the main governing body over the ACH system, allows for credit transaction reversals in four situations:

1. The payment was for the wrong amount

2. The payment was deposited in the wrong account

3. There was a duplicate deposit

4. An incorrect settlement date was listed

In most cases, the Originating Depository Financial Institution (ODFI) has up to five business days from the requested settlement date to deliver a reversal. It’s important to know that there’s not always a guarantee that the funds in question will still be there. While the RDFI may work with the recipient to restore the funds in some cases, it may take some time for them to do so, and they won’t always be successful.

→ Need to reduce payment risk and fraud? With Plaid IDV, companies can verify user identities in over 200 countries and territories in under 30 seconds.

What’s the difference between ACH credit and ACH debit?

In an ACH credit transaction, the originator requests to transfer money from their account to the recipient’s account. This is often referred to as a “push”. In an ACH debit transaction, the originator is requesting to withdraw money from the recipient’s account to their own, which is often called a “pull”. The two transaction types are the inverse of each other. 

Examples of consumers initiating ACH credit transactions include making bill payments through an online banking portal or sending peer-to-peer payments through an app. Though in most other cases for both debits and credits, either a company or a government agency acts as the originator, making it a credit or debit relative to their perspective. If they’re pushing money towards individuals via the ACH network, it’s an ACH credit. If they’re pulling money for payment via the ACH network, it’s an ACH debit.

What’s a typical fee for an ACH credit transaction?

ACH credit fees from the network itself are typically measured in fractions of a penny. Additional fees charged by processing partners can vary from tens of cents to as high as $1.50.

Some factors that can impact costs:

  • How many transactions are being processed per month

  • How large those transactions are

  • How likely they are to be returned

  • Whether the transactions are marked for same-day processing

  • Which account validation method is being used

While the smallest businesses may see direct costs of over a dollar per transaction, these costs quickly come down with scale.

→ Looking to reduce NSF fees and ACH returns? Plaid Balance allows companies to verify account balances in real-time to ensure users have enough funds to make successful payments. 

What does the future look like for ACH credit?

Though ACH credit transactions already total over $40 trillion per year—having increased by 10.8% from 2019 to 2020 alone—they’re likely to grow further in both number and value. Businesses will continue to switch over to ACH from paper checks, and innovations like instant account validation and identity verification will continue to make ACH more attractive.

This same innovation is also spurring the development of both complementary and competing products. The Clearing House has developed a product called Real Time Payments (RTP), and the Federal Reserve has announced their plans to launch their own real-time product called FedNow in 2023. The future will be rich with choice, as a variety of products—some built atop the ACH network and some running parallel to it—serve an ever-widening variety of needs.

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