ACH vs check at a glance
| ACH payment | Paper check | |
|---|---|---|
| What it is | An electronic instruction sent through the ACH network | A signed piece of paper |
| What has to happen first | The sender or the company being paid sends the instruction to its bank | The check must reach the payee, and the payee must deposit it |
| When the money moves | The same day, the next banking day or in two banking days | After the check is deposited and passed to the paying bank |
| If there is not enough money | The debit is returned with a code, within two banking days | The check bounces, and the bank can take the deposit back |
| Federal rule for a personal account | Regulation E | Regulation E does not cover checks. State law applies |
| Details it carries | A routing number and an account number | A routing number and an account number, printed along the bottom |
Speed
ACH. An ACH payment needs no delivery. A Same Day ACH payment settles on the day it is sent. A standard payment settles on the next banking day, or two banking days later for some credits. A standard ACH credit must be available to the receiver by 9:00 a.m., in the receiving bank’s local time, on the settlement date. See how long an ACH transfer takes.
Check. A check has two waits. First it must reach the payee, by hand or by mail, and be deposited. Then the bank decides when the money can be used. A federal rule, Regulation CC, sets the latest times, and the Consumer Financial Protection Bureau (CFPB) explains them.
| Check deposit | When the money must be available, in general |
|---|---|
| The first $275 of the checks deposited on one day | The next business day |
| A US Treasury check, or a cashier’s or certified check deposited in person | The next business day |
| A personal check drawn on the same bank, deposited in person | The next business day |
| The part of one day’s check deposits that is over $6,725 | The bank may hold it longer |
The two dollar amounts are in Regulation CC and have applied since July 1, 2025. They are adjusted for inflation every five years. The CFPB’s question-and-answer page still showed the older amounts, $225 and $5,525, when we checked it on October 2, 2026.
The CFPB also lists cases where a bank may hold a deposit for more than one business day. They include an account less than 30 days old, an account overdrawn too many times in the last six months, a check the bank believes may not be paid, and suspected fraud.
An ACH deposit is on the CFPB’s next-business-day list too. The difference is the wait before the deposit, and the longer holds that can apply to checks.
Cost
The ACH network costs banks a fraction of a cent for each payment. The Federal Reserve charges $0.0035 in 2026. What a business pays is set by its bank or payment tool. More examples are in ACH fees.
These prices are from Chase’s fee schedule for business accounts, effective June 14, 2026. We checked it on October 2, 2026. They are an example, not a rule.
| Item | Price |
|---|---|
| Send an ACH payment | $2.50 each for the first 10 a month, then $0.15 each |
| An order of business checks | Varies with the product, shipping costs and taxes |
| A cashier’s check | $10 |
| Stop payment on a check, placed online or by automated phone | $25 |
| Stop payment on a check or an ACH payment, placed with a banker | $30 |
A mailed check also takes an envelope, postage and someone’s time. The Association for Financial Professionals (AFP) compared what each kind of payment costs a business in its 2022 Payments Cost Benchmarking Survey. Nacha reported the results on February 14, 2022.
| Payment | Median cost for each payment, AFP survey of 2022 |
|---|---|
| Issuing (sending) a paper check | $2.01 to $4 |
| Receiving a paper check | $1.01 to $2 |
| An ACH payment | $0.26 to $0.50 |
Each figure is the range that the median cost fell in, for the businesses in the survey. It is not an average. For ACH, the survey counted bank fees and staff costs. These figures are from a 2022 survey, and your own costs may differ. A business that sends only a few ACH payments a month can pay its bank more than this for each one, as the Chase prices above show.
What can go wrong
| Problem | ACH payment | Paper check |
|---|---|---|
| Not enough money in the account | The bank returns the debit within two banking days, with code R01. The company may be allowed to try again | The check is returned unpaid. The bank that credited the deposit can take the money back and may charge a fee |
| A payment nobody authorized, on a personal account | Regulation E applies. Tell your bank within 60 days of the statement that shows it | State law applies. The OCC says your rights and time limits can differ from state to state |
| You want to stop it | For a recurring debit, tell your bank at least three business days before it is due | Ask your bank to place a stop payment on the check |
| The money is held | The ACH rules let a bank delay an ACH credit it reasonably suspects was not authorized or was sent under false pretenses. Regulation CC still applies. See ACH hold | A bank may hold a check deposit longer in the cases the CFPB lists |
When a check you deposited bounces, the OCC says the bank can reverse the funds and may charge a fee. The OCC also says you must go to the person who wrote the check if you want to be paid.
An ACH debit that comes back for not enough money may be sent again. It must then carry the words RETRY PYMT. See ACH return fees for what a returned payment can cost.
Which law covers each one
For a personal account the two are covered by different law.
- ACH payments are electronic fund transfers under the federal Regulation E. It gives you the right to dispute an error or an unauthorized transfer. Report it within 60 days of the statement that shows it.
- Paper checks are not. Regulation E says an electronic fund transfer does not include a transfer of funds originated by check. The OCC says the law for checks is a state law, the Uniform Commercial Code, and that your rights and the time you have to make a claim can differ from state to state.
- A check turned into an ACH debit is covered by Regulation E, because the payment itself is electronic.
Regulation E does not apply to business accounts. See ACH disputes.
How a paper check becomes an ACH debit
A company can use your paper check as the source of the numbers for a one-time ACH debit. This is called check conversion. The steps are simple.
- You give or mail a check. The company reads the routing number, the account number and the check number from it.
- The company gives you notice. Regulation E says it must tell you that the check will or may be processed as an electronic transfer. At a store counter the notice must be posted, and you must get a copy.
- You go ahead with the payment. That counts as your authorization.
- The company sends an ACH debit. The OCC says a company that converts a mailed check generally destroys the paper and keeps only an image. At a store, the clerk may stamp the check “void” and hand it back.
- Your statement may show ACH. The OCC says some checks you write might be listed as ACH on your statement, and that electronic payments may be grouped apart from your regular checks.
The OCC adds that a converted check may be paid from your account much more quickly than a check processed in the conventional way.
The ACH rules have a payment type for each situation.
- ARC: a check you mailed, or left in a drop box, to pay a bill.
- BOC: a check you handed over at a counter, converted later in the back office.
- POP: a check converted at the counter while you are there.
- RCK: a bounced check that is collected again as an ACH debit.
One detail about RCK. Regulation E does not cover a bounced check that is presented again electronically, because the payment started as a check. It does cover a fee that a company takes electronically because the check bounced, and the company needs your authorization for that fee.
The codes are in ACH SEC codes. What the line looks like on a statement is in ACH on a bank statement.
“Do not convert to ACH”
Some people write these words on a check to ask the company to process it as a paper check. Two official sources are relevant.
- The official commentary to Regulation E says a company may, at its option, specify the circumstances under which a check may not be converted.
- The OCC says you usually cannot choose how a check is processed. It adds that you can contact a company you regularly mail checks to, such as a phone or credit card company, and tell it not to turn your checks into ACH payments.
We found no official source that says the words written on a check bind the company. If it matters to you, contact the company.
Which one to use
ACH fits when
- the payment repeats, such as rent, payroll or a monthly bill
- you want it to settle on a set date
- you want a return code that says why a payment failed
A check may still fit when
- the other side has not given you bank details
- the payee asks for one
If you are a business that wants to move customers from checks to ACH, you need each customer’s authorization first. See how to accept ACH payments.
Common mistakes
- Writing a check before the money is there. The OCC says a converted check may be paid from your account much more quickly. Have the money in the account when you write the check.
- Treating a deposited check as cleared. The bank can take the money back if the check is returned unpaid.
- Treating a collected ACH debit as final on day one. It can still be returned.
- Looking for a converted check among your checks. It may be listed on your statement as an ACH payment.
- Assuming a check has the same dispute rules as ACH. Checks are under state law, and ACH payments on a personal account are under Regulation E.