ACH vs Wire Transfer: What's the Difference?

Sending money internationally from the UK often involves balancing cost and speed, especially when choosing between ACH and wire transfers.

These two methods work differently, which directly impacts fees, delivery times, and transparency. Understanding these differences matters for businesses managing cash flow and international payments efficiently.

In this guide, we've explained how ACH and wire transfers work, their typical costs and speeds, and when each option may be more suitable. We've also explained how Wise Business can help you manage international payments.

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Key Takeaways

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Key differences between ACH and wire transfers for UK businesses

When sending money from the UK to the US, ACH and wire transfers are two commonly used methods. While both move money electronically, they operate on different networks, which can affect speed, cost, and transparency.

Understanding ACH transfers

ACH stands for Automated Clearing House.¹ This is the electronic network used for bank-to-bank transfers within the United States.

For UK businesses, payments are typically facilitated through a provider that accesses the ACH network. Funds are converted and paid out locally in the US, often reducing costs. Because ACH payments are processed in batches, they may take longer but can be more cost-effective.¹

Understanding wire transfers

Wire transfers are direct bank-to-bank payments, often processed via the SWIFT network for international transfers.²

Funds may pass through intermediary banks before reaching the recipient. This can affect both timing and total cost, depending on the route and institutions involved.

Comparing cost for UK businesses

Costs can vary depending on the provider, currency route, and transfer size.

Typical fees for wire transfers

Wire transfers may include:

• Sending Fee: Typically £15 to £40 from UK banks
• Exchange Rate Markup: Banks may apply a margin to the exchange rate²
• Intermediary Fees: Additional charges may be deducted during processing²

These combined costs can make wire transfers relatively expensive.

Transparent pricing with Wise Business

Some providers, such as Wise, use local payment networks to reduce reliance on SWIFT.

Wise uses the mid-market exchange rate and displays fees upfront. Costs depend on the currency route and transfer amount, and may vary. This approach can make it easier to understand the total cost before sending.

Comparing speed for UK businesses

Wire transfer processing times

Wire transfers typically take 2-5 business days. Delays may occur due to intermediary banks, time zones, or cut-off times.²

ACH transfer processing times via Wise

ACH-based transfers via providers like Wise may arrive within 1-2 business days, depending on factors such as payment method and timing.

When to use ACH vs wire transfer for international payments

Choosing ACH for cost-effectiveness

ACH-based transfers can be suitable for regular payments where lower costs are a priority and delivery time is less critical.¹

Choosing wire transfer for urgent payments

Wire transfers may be used for larger or time-sensitive payments, although timing and costs can vary depending on the transfer route and banks involved.¹

Manage international transfers like a pro with Wise Business

Using the right payment method can help balance cost and speed when sending money abroad. This is where Wise Business can be an option worth considering.

With Wise Business, you can:

• 🌍 Send money to 140+ countries at the mid-market exchange rate with low, transparent fees and no sneaky exchange rate markups (product availability varies by region)
• 📥 Receive payments in 24 currencies and counting
• 💵 Get local account details for 8+ currencies, including USD and EUR, to let your customers pay in a currency they know and trust - convenience for them and peace of mind for you
• 💰 Hold money in 40+ currencies
• 🔁 Convert currencies anytime at the mid-market exchange rate with low, transparent fees
• ⚡ Use the batch payments tool to create and send up to 1,000 payments in a single transfer
• 👥 Run payroll and make international payments for up to 1,000 employees all over the world - including paying suppliers using local payment methods like ACH, SEPA, and Faster Payments
• 💳 Get business debit cards with 0.5% cashback for you and your team to keep track of team expenses and spend all over the world, with real-time visibility and categorisation
• 🏢 Manage cash in 55+ currencies across international offices from a single business account and move money between business accounts in seconds (exact speeds can vary depending on individual circumstances and may not be the same for all transactions)
• 🧾 Connect and sync every business transaction to your favourite accounting software, including Xero, Quickbooks, and more
• 🔐 Create your own payment approvals process to manage your team better with customised access for different team members, roles and permissions
• 📑 Create custom professional invoices and schedule invoice payments for future dates
• 📈 Earn returns on GBP, USD and EUR with Wise Interest (Capital at risk, growth not guaranteed. Your money is at risk if governments default or interest rates go negative. Visit https://wise.com/gb/interest/ to find out more)
• 🔗 Create payment links and QR codes to get paid easily
• ⚙️ Automate payouts with the Wise API (comes with 24/7 customer support, a sandbox account to test integrations, API tokens, and clear documents on how to implement and make the most of our API)

Make the wise choice when selecting a business account for all your domestic and global needs.

Be Smart, Get Wise.

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*Disclaimer: The UK Wise Business pricing structure is changing with effect from 26/11/2025 date. Receiving money, direct debits and getting paid features are not available with the Essential Plan which you can open for free. Pay a one-time set up fee of £50 to unlock Advanced features including account details to receive payments in 22+ currencies or 8+ currencies for non-swift payments. You’ll also get access to our invoice generating tool, payment links, QR codes and the ability to set up direct debits all within one account. Please check our website for the latest pricing information.

FAQs

What is the difference between ACH transfer and wire transfer?

ACH transfers are processed in batches through the US network, while wire transfers are individual bank-to-bank payments via SWIFT.¹

Is ACH only in the US?

Yes, ACH is a US domestic network, but providers can facilitate international transfers into it.¹

Is Zelle an ACH transfer?

No, Zelle operates separately, although it may use ACH infrastructure in some cases.³

Why is ACH slower than wire?

ACH payments are processed in batches, whereas wires are handled individually.¹

Are ACH and wire routing numbers the same?

No, banks often use different routing numbers for ACH and wire transfers.¹

Sources:

Sources last checked on 30 March 2026