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12 min

How Safe Are ACH payments? Risks and How To Stay Secure

Learn how safe ACH payments are, and how to protect your business from fraud.

Alanna Caplin
Published at | Updated:
A small business owner using a laptop to send ACH payments to her vendors.

Key takeaways

  • Recognize that ACH runs on the regulated Nacha network, which keeps unauthorized transactions rare.
  • Compare your options before paying, since ACH usually beats checks, wires, and cards on safety and cost.
  • Watch for stolen credentials and kiting, the most common ACH fraud tactics against small businesses.
  • Protect every payment with verification, account monitoring, and a secure platform like Melio.

What are ACH transfers and what are they used for?

ACH (Automated Clearing House) is a vetted nationwide network that coordinates electronic payments and money transfers between bank accounts. The network is made up of financial institutions that clear the transfer of funds. Businesses can also work with non-banks that process ACH payments on their behalf.

ACH is ideal for many kinds of payments, including recurring bills and vendor payments. That is why more businesses are choosing ACH as their preferred payment method.

Financial terms can be confusing, so let’s sort out the difference between ACH and EFT. EFT stands for Electronic Funds Transfer, an umbrella term for all digital payment methods. These include wire transfers, credit card payments, electronic checks, and direct deposits. So what is an ACH payment? It is just one type of EFT.

Check out our complete guide to ACH.

What’s keeping businesses from embracing ACH payments?

There is no doubt about it. Payments by paper check are on the decline, and they have been for the past two decades.

Today, more businesses and consumers prefer digital, paperless transactions such as card payments and EFTs.

Many businesses choose ACH for its speed. Want to know how long ACH transfers take? When initiated by the bank, they generally take one to three days to process. With Melio, ACH transfers arrive within three business days. Eligible Melio users can expedite payment and send a same-day ACH or even an instant transfer.

But despite the benefits of ACH, there is always some risk of fraud when moving money. That leads to the big question. Are ACH payments truly safe?

Is ACH safe?

Yes, ACH is safe. ACH payments run on a regulated, monitored network, and unauthorized transactions are rare. Here is what keeps them secure.

ACH is regulated by the federal government and managed by the National Automated Clearing House Association (Nacha), a non-profit that administers and monitors the ACH network.

ACH fraud and errors are not common, but they are not unheard of either. Thanks to the rules set by Nacha and the safeguards used across the banking and fintech industry, the error rate stays low. Nacha also revises its rules regularly to combat new threats and fraud schemes.

Nacha reports the ACH network processed 35.2 billion payments valued at $93 trillion in 2025, with the total value up almost 8% over 2024.

Even though ACH payments are regulated and safe, every business owner should understand and safeguard their payment process. This reduces risk and helps ensure the safety of ACH transactions.

Internal controls offered by Nacha

When a business registers with the Nacha network to enable ACH payments, it must provide identifying information such as usernames, passwords, bank details, and routing numbers. This data is the first step toward internal control of the payment process.

On top of this, merchants can add more guardrails to secure their ACH payments. They can work with payment providers that use encryption and tokenization, or use micro-validation to verify payment details before money moves.

Which is safer: ACH or credit card?

ACH and credit cards are both safe, but ACH often edges ahead on cost. Both use encryption and fraud monitoring, so the biggest difference is the fee.

ACH payments are generally considered as safe as, or safer than, credit card payments. Both methods face fraud attempts, but ACH tends to see lower losses per attempt.

Card fees are also much higher. Credit card processing fees typically run 1.5% to 3.5% of each transaction, according to NerdWallet, while ACH is usually a flat fee of about $0.20 to $1.50 per transaction, per Tratta. With similar safety and lower cost, ACH has a clear advantage.

Which is safer: ACH or wire transfer?

ACH is usually safer than a wire transfer for everyday business payments. Wires settle instantly and cannot be reversed, while ACH offers dispute rights and fraud monitoring.

Like ACH payments, wire transfers are a common target for fraudsters. But is ACH safer than wire? Generally, yes. If you want the fastest option of ACH or wire, wire wins, since it can settle the same day while ACH usually takes one to three days. Same-day ACH services are closing that gap.

Wire transfers also cost more than ACH transfers. With a better safety profile and lower fees, ACH comes out ahead for standard business payments.

Which is safer: ACH or a check?

ACH is much safer than a paper check. Checks remain the payment method most targeted by fraud, with 63% of organizations reporting attempted or actual check fraud in 2024, according to the AFP survey reported by the Federal Reserve.

Checks do have some protection measures, but they carry an inherent risk. They are still physical pieces of paper, so they can be misplaced, lost, stolen, or tampered with.

Given the speed and convenience of ACH, along with its much better safety profile, ACH payments keep gaining ground among small and mid-sized businesses.

How to avoid ACH payment fraud

Use the steps below to lower your ACH fraud risk. Sending and receiving payments is a core part of any business, and wherever money moves, fraudsters look for an opening. Every business is a target, no matter the size or industry.

According to the Association for Financial Professionals, 79% of organizations were victims of payment fraud, or an attempted attack, in 2024, as reported by Nacha. Most attempts still focus on checks, but ACH payment fraud is common too.

Small and mid-sized businesses (SMBs) are especially vulnerable. They often lack the resources to monitor and prevent fraud, and the cash reserves to absorb losses. That does not mean you should avoid ACH, one of the most popular and cost-effective ways to move money.

Instead, understand the types of ACH fraud you might face, and learn how to protect your business.

Common types of ACH payment fraud that affect small businesses

Any theft of funds through an unauthorized or fraudulent ACH payment counts as ACH fraud. In most cases, once the offender has the money, they quickly withdraw it before a dispute can be opened.

Here are the most common ways fraudsters target SMBs for ACH fraud.

Stolen credentials

The simplicity of ACH is also what makes life easy for some fraudsters. All they need is your bank account number and routing number. They then send money to an account they control, or set up payments for goods you never bought.

Scammers use several tactics to get private banking information:

  • Data breaches: Your bank details often sit with vendors, service providers, and customers. If any one of them is breached, you can be exposed.
  • Careless storage: A sticky note with your bank info, or an accidental photo posted online, can hand your details to anyone.
  • Insider theft: A trusted employee may misuse your credentials or trick a colleague into sending funds.
  • Spyware and keyloggers: Malware can record every keystroke, including usernames, passwords, and banking details.
  • Phishing: A fake email or text links to a lookalike login page that captures your credentials.

In an identity theft scheme, an attacker impersonates an employee or vendor to get you to send money to the wrong account. To seem credible, they may use:

  • A real but hacked email owned by the person they are impersonating
  • A fake email with an address that looks close enough to be mistaken for the real one
  • Fake invoices with your vendor’s real details but the fraudster’s bank information
  • SMS spoofing, where texts appear to come from the person being impersonated

Kiting

Kiting is an illegal activity in which a criminal uses the time it takes banks to process transactions to gain credit or steal money.

In essence, they use non-existent funds to inflate their cash reserves by moving money between accounts. The cycle repeats until the offender is caught or has enough real cash. If your payment is caught at the end of the cycle, you take the loss.

Kiting started with paper checks, but it can also work with ACH transactions that take a few days to process. Here are two scenarios that show how ACH kiting may affect your small business.

Scenario 1: The fraudster uses ACH to pay from an account with insufficient funds. Before the money is deducted, they use a second empty account to send another ACH transfer to cover the first. This turns the ACH payment into short-term credit with no real backing.

Scenario 2: A customer pays by ACH, then claims an issue with the product and requests a refund by cash or debit while the ACH is still processing. The business issues the refund, then learns days later that the original payment was rejected for insufficient funds.

The impact of ACH fraud on businesses

Like any financial fraud, ACH fraud hurts businesses of every size. The consequences go beyond the obvious financial loss. For example:

  • Operational disruption: Time and resources spent resolving fraud can delay services and important projects.
  • Reputation damage: Insecure payments weaken customer trust, and can destroy it entirely.
  • Increased costs: Beyond the stolen funds, there are investigation costs, legal fees, and new security spending.
  • Cash flow issues: Losses and added costs can make it harder to meet payroll and pay suppliers, especially for SMBs with limited cash flow.

Eight ACH payment fraud prevention strategies for small businesses

SMBs rarely have deep resources to fight fraud, but not every safeguard costs money. By understanding the risks and adding a few controls, you can cut your exposure to ACH fraud. Here are eight tips to help.

1. Keep bank details on a need-to-know basis

Everyone who knows your bank account details is a potential risk. Minimize how many people can see this sensitive information.

Your bookkeeper needs access, but not every employee does. Use good judgment about who truly needs your bank details to do their job. If someone sends only an occasional payment, it may be safer to handle it yourself.

2. Use three-way matching

Three-way matching helps you pay the right person for the right thing. You compare the invoice against your purchase order and order receipt. The key details to match are the amount, the goods provided, and the vendor’s payment information.

3. Don’t click on random links

This is a cybersecurity basic, not just a fraud tip. Malicious links are one of the most common ways attackers spread malware and spyware.

Be wary of links, and only click when you are sure who sent them and why.

4. When in doubt, call

When something looks off, such as an email full of typos or a sudden request to change payment details, call to double-check before you pay.

Do not just text back, since you could be talking to the attacker. Use the phone number in your files, not the one in the suspect message.

5. Educate yourself (and your team)

Attackers keep getting more sophisticated, so stay current on the threats in your industry. Train your team regularly on how to spot and report them.

6. Make sure you’re covered

If an insider does commit fraud, fidelity insurance can cut your losses. It covers your company against damage caused by dishonest activity from someone on your team.

7. Keep an eye on your money

Nacha and your bank offer protection against fraudulent ACH payments, but it is your job to monitor your account and report anything suspicious. Know what is happening in your account at all times.

Ask your bank about email or text alerts for every transaction. This helps you catch issues without logging in daily.

8. Use digital payment platforms

A digital payment platform like Melio lets you manage incoming and outgoing payments while keeping your details safe. You no longer have to share your information with customers or employees.

When you enter your payment and bank details, they stay hidden and encrypted. Melio also lets you set up payment approval workflows, so you have the final say before any payment goes out.

Guarantee your information stays secure when using ACH transfers

A few smart precautions keep your ACH payments smooth and safe. Here are some ways to protect your information when sending ACH transfers.

Use a trusted provider

Make sure any third-party payment system follows Nacha’s operating rules. Melio, for example, is trusted by businesses, banks, credit card issuers, and financial institutions across the U.S.

Protect private information

Tokenization and encryption both reduce data exposure. Encryption encodes data so only the intended recipient can read it, and Nacha requires it when transmitting over an unsecured network.

Tokenization replaces private information, such as an account number, with a unique and unrelated set of characters. That token holds no value, so it is worthless to others.

Use micro deposits

Many processors make small deposits into your account to verify your identity before any formal transaction. Melio uses micro-deposits as a validation step when connecting a bank account.

ACH payments: go for it!

If you are considering online ACH payments for your business, partner with a provider like Melio that offers built-in ACH functionality with extra security guardrails. If you want ACH credit vs debit capabilities and an alternative to slow checks, sign up for Melio today.

ACH payment safety FAQs

What are the risks of ACH payments?

The main risks are unauthorized debits and fraud that starts with stolen bank details. These are rare, and you can lower the risk with account monitoring and payment verification.

Is Zelle or ACH safer?

Both are secure. ACH runs on the regulated Nacha network with clear dispute rules, while Zelle transfers are instant and hard to reverse, so ACH gives you more protection for business payments.

Is it safer to use a debit card or ACH?

ACH is generally safer for recurring business payments. It uses bank-level security and adds Nacha oversight, without exposing a card number at checkout.

Which is safer, ACH or a wire transfer?

ACH is usually safer for everyday payments. Wires settle instantly and cannot be reversed, while ACH offers dispute rights and fraud monitoring.

*This blog post is intended for informational purposes only and is not intended as financial advice.
**Melio does not provide legal, tax or accounting advice, and you should consult with a professional advisor before making any financial decisions.

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