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MXNACH sends payments in batches through the Federal Reserve and The Clearing House. It usually settles in one or two business days, or the same day with Same Day ACH, and costs little. A domestic wire moves through the Fedwire Funds Service one payment at a time and is final once processed. Use ACH for routine invoices and a wire for large or deadline-bound payments.
In this article
- 01What is the difference between ACH and a wire?
- 02How does each one move money?
- 03How fast is Same Day ACH, and what is the limit?
- 04How do ACH and wires compare?
- 05Can an ACH payment be returned or reversed?
- 06How do you protect ACH and wire payments from fraud?
- 07Which should you ask clients to use?
- 08How do Vezmo invoices and USD details handle ACH and wires?
- 09Questions
- 10Sources
What is the difference between ACH and a wire?
Both move US dollars between accounts inside the US. ACH groups payments into files and settles them at set times. A wire moves one payment at a time and settles it as soon as it is processed.
ACH is the US network that moves electronic payments between bank and credit union accounts in batches. Banks send files of payments to an ACH operator, either the Federal Reserve or The Clearing House, which sorts and settles them at set times. ACH can push money to an account (a credit) or pull money from one (a debit).
A domestic wire is a payment from one US bank to another that settles on its own, typically through the Federal Reserve's Fedwire Funds Service. The Federal Reserve calls Fedwire a real-time gross settlement system. Each transfer is final and irrevocable once processed. Businesses use wires mainly for large or urgent payments.
This guide covers payments inside the US. A client abroad who pays by SWIFT uses a different route through correspondent banks; see local account details vs a SWIFT wire.
How does each one move money?
Nacha, which writes the ACH rules, calls ACH a batch process, store-and-forward system. Your client's bank sends payment instructions in a file to an ACH operator, which passes each payment to your bank. The Federal Reserve, one of the two operators, calls its FedACH service low-cost batched payment services.
Nacha says the ACH Network is open 23¼ hours every business day and settles payments four times a day. Settlement happens only while the Federal Reserve's settlement service is open, so ACH does not settle on weekends or federal holidays. Nacha estimates that 80% of ACH payments settle in one banking day or less.
A wire works differently. On the Fedwire Funds Service, the sending bank tells its Federal Reserve Bank to move money from its own account to the receiving bank's account. The Federal Reserve says each transfer is immediate, final and irrevocable once processed, and that Fedwire is generally used for large-value, time-critical payments.
The Federal Reserve says the Fedwire business day runs from 9:00 p.m. Eastern Time the evening before to 7:00 p.m. Eastern Time, Monday to Friday, and customer transfers must be sent by 6:45 p.m. Eastern Time. Your bank sets an earlier cut-off for customer wires, so a late-afternoon request may go out the next business day.
How fast is Same Day ACH, and what is the limit?
Same Day ACH lets banks settle an ACH payment on the day it is sent. Nacha's rules set three same-day settlement times: 1:00 p.m., 5:00 p.m. and 6:00 p.m. Eastern Time. Each bank sets its own submission cut-offs ahead of those times.
For a Same Day ACH credit, Nacha's rules say the receiving bank must make the money available by 1:30 p.m. in its local time for the first window, 5:00 p.m. for the second and the end of its processing day for the third.
- Per-payment limit: $1 million, in effect since 18 March 2022. Nacha says a payment above the limit is not rejected. It is given next-day settlement instead.
- Coming change: Nacha announced on 27 April 2026 that the limit will rise to $10 million per payment on 17 September 2027.
- International ACH: payments coded as international ACH transactions (IAT) are not eligible for Same Day ACH.
- Bank support: not every bank offers Same Day ACH to customers, and some charge extra for it.
How do ACH and wires compare?
| ACH | Domestic wire (Fedwire) | |
|---|---|---|
| How it settles | In batches, at set times each business day | One payment at a time, as soon as it is processed |
| Typical speed | One to two business days, or the same day with Same Day ACH | Usually the same business day, if sent before your bank's cut-off |
| Cost to send | Low or free at many banks. Payment processors charge a fee when a client pays an invoice by ACH | Banks commonly charge a fee for each outgoing wire |
| Cost to receive | Usually free | Many banks charge an incoming wire fee |
| Can it be undone? | Debits can be returned within Nacha's time limits. The sender can reverse a credit only for an error, within 5 banking days | Final once processed. The sender can only ask the receiving bank to return it |
| Limits | $1 million per Same Day ACH payment. Your bank sets limits for standard ACH | Your bank sets your limit |
| Details needed | Account holder name, routing number, account number and account type | The same, plus the account holder's address and the receiving bank's name and address. Some banks use a separate routing number for wires |
| Good for | Regular invoices, payroll and supplier bills | Large one-off payments, deadlines and property or equipment purchases |
Fees vary widely by bank, so check your fee schedule. Both methods use the routing number, the nine-digit ABA number that identifies the receiving institution. Card and cross-border costs are covered in international payment processing fees.
Can an ACH payment be returned or reversed?
It depends on who starts the payment. Nacha calls an ACH credit a push from the sender's account and a debit a pull from the payer's account. Money a client sends to your account details is a credit. An online invoice paid with bank details is usually a debit that the client authorizes.
- Standard returns: two banking days. The receiving bank can return an entry, for example when the account is closed or can't cover a debit. Nacha's standard time frame ends at the opening of business on the second banking day after settlement.
- Unauthorized debits from a consumer account: 60 days. The Nacha Operating Rules let a consumer's bank return a debit the consumer says they did not authorize within 60 days, once it has the consumer's Written Statement of Unauthorized Debit. Debits for the wrong amount or date get the same window.
- Unauthorized debits from a business account: two banking days. If the payer is a company, its bank has two banking days to return an unauthorized debit.
- Credits sent in error: five banking days. Nacha lets the sender reverse a credit only for an error, such as a duplicate payment, the wrong receiver or the wrong amount. The reversal must reach the receiving bank within five banking days after settlement.
If your clients are businesses, the return window on a debit is short. A debit from a consumer account can come back up to 60 days later, so plan for that before you ship goods or hand over work.
A wire has no return window. If you sent one by mistake, your bank can ask the receiving bank to send the money back. That bank has to agree, and the money has to still be in the account.
How do you protect ACH and wire payments from fraud?
The most common trap for both methods is a fake change of payment details. A scammer takes over or imitates a supplier's email and asks you to pay the next invoice to a new account. The FBI's Internet Crime Complaint Center (IC3) counted, in a September 2024 notice, about $55.5 billion in exposed losses from business email compromise between October 2013 and December 2023.
Wires carry the most risk because they are final once processed. An ACH credit is also hard to get back once it has settled into someone else's account. Three habits help:
- Call before you pay a new account. Use a phone number you already have on file, never one from the email or invoice that asked for the change. The IC3 advises using a second channel to verify any request to change account information.
- Use two people for large payments. One person sets up the wire and another approves it after confirming the details.
- Send a small test payment first when you pay a new supplier a large amount, and confirm with them that it arrived.
Nacha rules phased in during 2026 require banks to use risk-based processes to spot ACH payments made because of fraud, including incoming credits. Your bank may hold or question an unusual payment as a result.
Which should you ask clients to use?
For most businesses, ACH works as the default and wires cover the exceptions:
- Routine and recurring invoices: ACH. It costs your client little or nothing and usually arrives within two business days.
- A payment you need today: Same Day ACH, if your client's bank offers it and the amount is $1 million or less. Otherwise, a wire.
- Large one-off payments, such as an upfront project fee: a wire, if the client accepts the fee. It usually arrives the same business day and is final.
- Small invoices from clients who prefer cards: a payment link they can pay by card. Card fees are higher than ACH, so this suits smaller amounts.
- Paying a US supplier: use the method they prefer and confirm their details by phone the first time.
If your business is outside the US, USD account details let US clients pay you by domestic ACH or wire instead of an international SWIFT wire. More steps are in getting paid by US clients from abroad.
How do Vezmo invoices and USD details handle ACH and wires?
Vezmo is a financial technology company, not a bank. A VezmoPay invoice lets your client pay by ACH bank payment for 0.9% + $1.00, capped at $10.00, or by card, Apple Pay or Google Pay.
For clients who would rather send the money themselves, USD account details for ACH and wire are in early access. The details are free, and so is receiving ACH and domestic wire (Fedwire) payments. Clients pay into an account held by Vezmo's regulated partners & Bank, and the money is credited to your Vezmo balance, which belongs to your business. It is not a bank account in your name.
Which details a business can get depends on where it is registered and where its owners live, and this is checked when you apply. Conversion and payout fees are shown before you confirm. Read how money is held.
Questions
Is ACH or a wire faster?
A domestic wire usually arrives the same business day if it goes out before your bank's cut-off. Standard ACH takes one to two business days, and Same Day ACH can settle the same day for payments up to $1 million.
Is ACH cheaper than a wire transfer?
Usually. Many banks charge little or nothing for ACH, while wires commonly carry a fee to send and often one to receive. Fees vary by bank, so check your fee schedule.
Can a wire transfer be reversed?
Not by the sender. The Federal Reserve treats a Fedwire transfer as final and irrevocable once processed, so your bank can only ask the receiving bank to return the money.
How long does a customer have to dispute an ACH debit?
Under the Nacha Operating Rules, a consumer's bank can return an unauthorized debit within 60 days, with the consumer's written statement. For a business account, the window for an unauthorized debit is two banking days.
What is the Same Day ACH limit?
It is $1 million per payment as of 24 Oct 2026. Nacha has approved a rise to $10 million per payment, effective 17 September 2027.
Can a business outside the US receive ACH and wire payments?
Yes, if it has USD account details with a US routing number. US clients then pay it the same way they pay a domestic supplier, by ACH or domestic wire.
Sources
Each one is the organization’s own page, checked 24 Oct 2026. Rules and fees change, so check them before you act.
- Nacha: Expanding Same Day ACH
- Nacha: What is ACH
- Nacha: How ACH payments work
- Nacha ACH Guide for Developers: How ACH works
- Nacha: Increasing the Same Day ACH dollar limit to $10 million
- Nacha: Same Day ACH per payment limit to increase to $10 million (27 Apr 2026)
- Nacha: Same Day ACH dollar limit increase to $1 million
- Nacha: Same Day ACH, moving payments faster (Phase 3)
- Nacha: Differentiating unauthorized return reasons
- Nacha: Risk management topics (effective 1 Oct 2024)
- Nacha: ACH Network rules, reversals and enforcement
- Nacha: New risk management rules now in effect (20 Mar 2026)
- Federal Reserve Board: Fedwire Funds Services
- Federal Reserve Financial Services: Fedwire Funds Service
- Federal Reserve Financial Services: FedACH Services
- FBI IC3: Business email compromise, the $55 billion scam (11 Sep 2024)
- American Bankers Association: ABA routing number
Vezmo is a financial technology company, not a bank. Banking, stablecoin and card services are provided by regulated partners & Banks. Last reviewed 24 Oct 2026.