An ACH payment is an electronic transfer of money from one bank account to another through the Automated Clearing House network

ACH stands for Automated Clearing House, a system that moves money between bank accounts electronically instead of by check or wire. When you set up an automatic mortgage payment, authorize a paycheck deposit, or pay a bill online through your bank's website, you are almost certainly using ACH. The money moves from one account to another in one to three business days, and the cost to you is usually nothing.

ACH is different from a wire transfer, which moves money the same day but costs money and is harder to reverse. It is also different from a credit card payment, which goes through a separate network. For homeowners, ACH matters because many mortgage lenders, property tax collectors, and insurance companies offer discounts if you pay by ACH instead of check, and because understanding how it works helps you avoid overdrafts and timing mistakes.

Key Takeaways

  • ACH transfers move money between bank accounts electronically and usually take one to three business days to complete.
  • Most ACH payments are free or cost only a few dollars, making them cheaper than wire transfers or paying by check.
  • You authorize an ACH payment by giving a company your bank account number and routing number, either on paper or online.
  • ACH payments can be reversed within a limited window if there is an error, but once the money arrives at the receiving bank, reversal becomes harder.
  • Many mortgage lenders and insurance companies offer a small discount for paying by ACH instead of check or credit card.

How ACH transfers actually move your money

When you authorize an ACH payment, you give a company permission to pull money from your account (or push money into it, in the case of direct deposit). That company submits your payment information to its bank, which bundles it with thousands of other ACH transactions and sends them to the Federal Reserve or a private ACH operator. That operator sorts all the transactions by receiving bank and sends them to the receiving bank, which deposits the money into the payee's account.

The whole process takes one to three business days. This delay is why you cannot pay a mortgage that is due tomorrow by ACH—you have to initiate it days in advance. Weekends and federal holidays add to the delay, so a payment you submit on Friday afternoon might not arrive until Wednesday. Most mortgage servicers and billers tell you the cutoff time for same-day processing (usually early morning) and the expected arrival date before you confirm the payment.

The Federal Reserve processes the majority of ACH transactions, but private networks like The Clearing House also handle ACH payments. From your perspective as a homeowner, this makes no difference—the timing and cost are the same.

What information you need to give to set up an ACH payment

To authorize an ACH payment, you need to provide your bank account number and your bank's routing number. The routing number is a nine-digit code that identifies your specific bank branch; you can find it on the bottom left of any check, or by calling your bank. You also need to decide whether the payment is a one-time transfer or a recurring automatic payment, and if recurring, on what day of the month.

Most mortgage servicers, property tax offices, and insurance companies let you set up ACH payments through their website or by phone. Some still accept a voided check instead of asking for the routing number separately. Never give your account information to someone who calls you unsolicited—legitimate billers let you initiate the payment yourself through their secure website or a phone number you look up independently.

Why ACH payments are safer than you might think

Many people worry about giving their bank account number to a company, but ACH payments are actually harder to misuse than credit card numbers. With ACH, a company can only pull money on the dates and in the amounts you authorize. If a company tries to pull more money than you approved, or pulls on a day you did not authorize, your bank can reverse the transaction—this is called an ACH dispute.

You have the right to dispute an unauthorized ACH payment for up to 60 days after it appears on your statement. Your bank must investigate and return the money while the investigation is pending. If the company can prove you authorized the payment, you lose the dispute, but the burden is on them to prove it. This protection is weaker than the fraud protection on credit cards, which is why using ACH for a one-time payment to an unfamiliar company carries more risk than using a credit card.

For recurring payments to companies you know—your mortgage servicer, your insurance company, your property tax collector—ACH is very safe. The company has no incentive to overcharge you, and if they do, the reversal process is straightforward.

ACH payments versus checks, credit cards, and wire transfers

A check takes five to seven business days to clear and costs you nothing, but it requires you to write and mail it, and the recipient has to deposit it. An ACH payment takes one to three days, costs nothing, and requires no physical mail. Most mortgage servicers now charge a fee if you pay by check but offer free ACH payments, so ACH has become the default.

A credit card payment processes immediately or within one business day, but credit card companies charge the merchant a fee (usually 2 to 3 percent), and many mortgage lenders pass that fee to you or refuse credit card payments altogether. Some lenders offer a small discount—typically 0.25 percent off your interest rate—if you pay by ACH instead of credit card.

A wire transfer moves money the same day but costs $15 to $50 and is nearly impossible to reverse once it leaves your bank. Wire transfers are useful only when you need money to move immediately, such as at closing on a home purchase. For routine mortgage or insurance payments, ACH is faster and cheaper than a check and cheaper than a wire.

Common mistakes people make with ACH payments

The most common mistake is submitting an ACH payment too close to the due date and assuming it will arrive the same day. If your mortgage payment is due on the 15th and you submit an ACH payment on the 14th, it will likely arrive late and trigger a late fee. Most servicers recommend submitting ACH payments at least three business days before the due date, and five days if the due date falls on a weekend or holiday.

Another mistake is setting up an automatic ACH payment and then forgetting about it. If you change banks or close an account, the automatic payment will fail and your bill will go unpaid. Before you close an account, check all your recurring ACH payments and update them with your new bank information or cancel them if you no longer need them.

A third mistake is authorizing ACH payments to multiple companies without tracking them. If you set up automatic payments for your mortgage, property tax, homeowners insurance, and utilities, you might overdraft your account if all four payments happen to process on the same day. Most banks let you see pending ACH transactions in your online account, so you can plan around them.

How to set up or cancel an ACH payment

To set up a one-time ACH payment, log into the biller's website (your mortgage servicer, insurance company, or tax collector) and look for a "Pay Now" or "Make a Payment" button. You will be asked for your bank account number and routing number, the amount, and the date you want the payment to process. Review the information carefully—especially the amount and the date—before you confirm.

To set up a recurring automatic ACH payment, follow the same steps but select "Automatic" or "Recurring" instead of "One-Time." You will be asked how often the payment should recur (usually monthly) and on what day. Most servicers let you choose the day of the month, but some only offer a fixed date. After you confirm, the biller will send you a confirmation email with the details.

To cancel an automatic ACH payment, log back into the biller's website and look for a "Manage Payments" or "Recurring Payments" section. Select the payment you want to cancel and confirm the cancellation. Do this at least three business days before the next scheduled payment date, or the payment may still process. If a payment processes after you cancel, contact the biller and ask them to reverse it.

Frequently Asked Questions

Can I stop an ACH payment after I have submitted it?

Yes, but only if you act quickly. You have until the end of the business day before the payment is scheduled to process. Contact your bank or the biller and ask them to cancel the payment. Once the money leaves your account, reversal is much harder and may take weeks. If the payment has already arrived at the receiving bank, you will have to ask the biller to refund it.

What happens if I give the wrong account number for an ACH payment?

The payment will be rejected and returned to your account within one to three business days. Your bank will notify you of the rejection. If you accidentally send money to the wrong account, contact your bank immediately and ask them to attempt a reversal. The receiving bank is not required to return the money, but many will if you explain the mistake quickly.

Do I have to pay a fee for ACH payments?

Most ACH payments are free when you pay a bill directly through the biller's website or your bank's bill pay service. Some banks charge a small fee (usually $1 to $3) if you use their bill pay service to send an ACH payment to a company that does not have an account with that bank. Always check before you submit the payment.

Is ACH the same as direct deposit?

Direct deposit is a type of ACH payment, but ACH is broader. Direct deposit is when your employer or a government agency pushes money into your account automatically. ACH includes direct deposit, automatic bill payments, and one-time transfers between accounts. Both use the same network and take one to three business days.

Can I dispute an ACH payment if I simply changed my mind?

No. ACH disputes are only for unauthorized payments or payments in the wrong amount. If you authorized the payment and the amount was correct, you cannot dispute it just because you changed your mind. Your only option is to ask the biller to refund it voluntarily, which they are not required to do.