Two ways of moving money between accounts, with different costs, different speeds and, importantly, different reversibility.
That last difference is the one that matters most and gets the least attention. One method settles in batches and can sometimes be recalled; the other is fast and effectively final, which is why fraud concentrates around it.
This covers how each works, a direct comparison, when each is the right choice, and the redirection fraud that targets the faster one.
ACH and wire transfers are the two primary electronic payment rails in the US. Both move money between bank accounts, but they work differently in speed, cost, reversibility, and use case.
ACH Payments
ACH (Automated Clearing House) is a batch-processing network managed by NACHA (National Automated Clearing House Association). Transactions are grouped and processed in batches throughout the day.
- Settlement: Same-day ACH or next-business-day ACH (standard). Same-day ACH is available for most transactions under $1M.
- Cost: $0.20 - $1.50 per transaction (varies by bank and volume). Very low cost for high-volume payors.
- Reversibility: ACH transactions can be reversed within 60 days for fraud, error, or authorisation issues. ACH returns are common.
- Risk: Reversibility means ACH carries fraud risk for the recipient, funds received can be clawed back.
- Limits: NACHA same-day ACH cap is $1,000,000 per transaction.
Confirm any change of bank details by ringing a number you already have, never one from the email requesting the change. Instant, final transfers are what payment redirection fraud is built around, and speed is exactly what makes them unrecoverable.
Ankit Sagatani, MBA, B.Com · LinkedInWire Transfers
Wire transfers use real-time gross settlement (RTGS), each transaction settles individually, immediately, across Fedwire (domestic) or SWIFT (international).
- Settlement: Domestic wires settle the same business day if initiated before the bank's cut-off (typically 4-5pm ET). International SWIFT wires take 1-5 business days.
- Cost: Domestic outgoing $15-$50 per wire. International outgoing $25-$75. Receiving fees $0-$20.
- Reversibility: Wires are generally irrevocable once settled. Recall requests are possible but not guaranteed and often fail.
- Risk: Irrevocability makes wires the target of business email compromise (BEC) fraud, always verify wire instructions by phone.
Side-by-Side Comparison
| Factor | ACH vs Wire |
|---|---|
| Settlement speed | ACH: same-day or next-day. Wire: same-day domestic, 1-5 days international |
| Cost (outgoing) | ACH: $0.20 - $1.50. Wire: $15 - $75 |
| Reversibility | ACH: reversible within 60 days. Wire: generally irrevocable |
| Transaction limits | ACH: up to $1M same-day. Wire: no standard limit (bank-specific) |
| Network | ACH: batch (NACHA). Wire: real-time (Fedwire/SWIFT) |
| International | ACH: US domestic only. Wire: global via SWIFT |
| Fraud risk to recipient | ACH: higher (reversals). Wire: lower (irrevocable) but higher for sender (BEC fraud) |
When to Use ACH
- Payroll: ACH is the standard for direct deposit
- Recurring vendor payments: utility bills, subscriptions, recurring invoices
- Customer refunds: low cost for high volume
- Government tax payments: IRS EFTPS uses ACH
- Any high-volume, lower-dollar payment where cost efficiency matters
When to Use Wire Transfer
- Real estate closings: large, irrevocable settlement required
- M&A transaction proceeds: speed and finality needed
- International vendor payments: cross-border where ACH does not reach
- Large one-time payments where same-day settlement is critical
- Situations where the recipient requires guaranteed funds (irrevocable proof of payment)
Wire Transfer Fraud Warning
Business Email Compromise (BEC) fraud targeting wire transfers costs US businesses billions annually. Fraudsters intercept or spoof vendor emails and change wire instructions to redirect funds.
Pro Tip: Never wire funds based solely on an email instruction. Always verify wire details by phone using a number from a previously established contact, not a number in the suspicious email.
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Frequently Asked Questions
Is Zelle or PayPal an ACH transfer?
Zelle uses the ACH network for final settlement but provides near-instant availability through bank guarantee. PayPal uses ACH for bank transfers (1-3 business days) and card networks for instant transfers (with fees).
Can a wire transfer be reversed?
Unlike ACH, wire transfers are generally irrevocable. The sending bank can request a wire recall through Fedwire, but the receiving bank is not obligated to return funds, especially if they have been disbursed. Recovery usually requires cooperation of both banks and, in fraud cases, law enforcement.
What is the difference between domestic and international wires?
Domestic wires use Fedwire (within the US) and settle same-day. International wires use SWIFT and typically require correspondent bank routing, taking 1-5 business days. SWIFT wires carry higher fees and may involve currency conversion.
Which method should we ask our own customers to use?
For recurring billing, ACH, because the cost per transaction is low enough not to matter and the payment can be initiated on a schedule rather than waiting on someone to act. Reserve wires for one-off amounts large enough that same-day settlement and irrevocability are worth paying for, and for counterparties abroad. Offering both and letting the customer choose usually means you pay wire costs on payments that never needed them.
How do we record the bank charges on these payments?
Bank fees are an operating expense in their own right, not a reduction of revenue, so the invoice is recorded gross and the charge is posted to bank charges. That matters more than it sounds: netting the fee against the receipt makes the invoice look part paid, leaves a residue on the customer's account and quietly understates both revenue and costs. Where the fee is deducted before the money lands, split the deposit at the point of entry.
Written by
Ankit Sagatani, MBA, B.Com
Ankit works with business owners across the US on industry-specific bookkeeping, from real estate to construction and retail. He writes about what each trade's books actually need. Connect on LinkedIn Connect on LinkedIn
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