The US banking system offers two different timelines for payments. ACH payments are bank-to-bank transfers that settle in batches, taking up to three business days to move money between accounts. In 2025, the ACH Network processed over 35 billion payments worth $93 trillion.

Real-time payments are bank-to-bank transfers that settle in seconds, every hour of every day. The right method depends on whom you’re paying, what you’re paying for, and how time-sensitive the payment is.

Below, we’ll cover how real-time payments vs. ACH transfers work, the key differences, and how to choose the right payment method for your specific use case.

Key takeaways

• ACH remains the default for high-volume, predictable payments such as payroll and recurring billing, where cost efficiency and reversibility matter more than speed.

• Real-time payment networks are built for scenarios where settlement speed directly affects the end-user experience, such as insurance disbursements.

• Many businesses combine ACH for cost-efficient, predictable flows and real-time networks for time-sensitive disbursements, rather than choosing a single solution.

How does traditional ACH work?

Standard ACH payments settle in one to three business days—no weekends or federal holidays—and they support reversals. If a business mistakenly makes a duplicate payment or uses an incorrect account, there’s a defined reversal window that’s typically within five business days of the original transaction date. For high-volume billing workflows, reversibility is a key advantage, which real-time payment networks can’t offer.

Same Day ACH is an upgrade within Nacha’s existing ACH framework. Transactions submitted before the daily cutoff settle the same business day, which is faster than standard ACH. But it’s still batch-based, limited to business days, and subject to ACH reversal rules. The per-transaction limit will be raised to $10 million in 2027. This method is often the middle ground for businesses that need speed without instant settlement.

What counts as a real-time payment in the US?

A real-time payment (RTP) has three defining attributes: instant settlement, continuous availability with no batch windows or holiday cutoffs, and irrevocability. Unlike ACH transfers, once an RTP payment settles, it’s final, which means verification must happen before the payment goes out rather than after.

There are two types of real-time payments:

The Real-Time Payments Network

Operated by The Clearing House, The RTP Network connects hundreds of financial institutions and reaches a substantial share of US demand deposit accounts. Transactions settle in seconds, and the network’s per-transaction limit sits at $10 million, though individual banks can set lower caps. Participation skews toward larger banks, which creates gaps depending on whom you’re paying.

FedNow

Launched by the US Federal Reserve, FedNow runs on the same core principle as RTP, but has a greater reach. Because it operates through the Fed’s existing relationships with nearly every US depository institution, it’s positioned to serve US banks and credit unions. The default per-transaction limit is $1 million, though individual institutions can set their own lower caps.

How do real-time payments vs. ACH compare side by side?

ACH and real-time payment networks solve distinct problems. Their key differences include reversibility, availability, and bank coverage.

When are real-time payments the right choice?

In specific scenarios, the timing of a payment changes the actual experience of your product or service.

Here are some examples:

• Insurance claim disbursements: A policyholder filing a claim after a car accident expects funds to clear quickly. Insurers using real-time payments can disburse approved claims in minutes.

• Earned wage access: Gig platforms and employers offering on-demand pay need a payment network that works even on weekends, which makes RTP and FedNow the right choice. If funds take a business day to land, the entire value proposition of earned wage access becomes weaker.

• Urgent B2B disbursements: Supplier payments that need to arrive before a weekend, contractor payments tied to project milestones, and emergency vendor settlements are cases where ACH settlement creates friction in a business relationship.

• Account-to-account transfers where confirmation matters: When a counterparty needs to see funds before taking the next step in a workflow, ACH settlement times can introduce delays that real-time payment networks eliminate.

When does ACH remain the practical option?

ACH transfers are still commonly used across the US when the use cases depend on cost sensitivity, predictable timing, and workflows where reversibility actually matters.

Here’s when ACH makes the most sense:

• Payroll: Paydays are predictable. A Friday deposit that arrives Thursday night via standard ACH works fine for the bulk of payroll scenarios, and the cost savings of ACH over real-time payment networks can add up fast.

• Recurring billing: The payer knows the charge is coming, the payee knows when to expect the funds, and there’s no benefit to settling in seconds when both sides have already accounted for the timing.

• High-volume B2B invoice payments: Many B2B payment workflows run on net-30 or net-60 terms. Settlement timing within a business day is irrelevant when the invoice itself has a 30-day horizon. ACH handles the volume at a cost point that real-time payment networks can’t match.

• Situations where reversibility matters: If your payment workflow includes a meaningful rate of disputes, errors, or returns, ACH’s return mechanism is a genuine advantage. Building a disbursement process around irrevocable real-time payments requires more upfront verification to compensate for the absence of a return safety net.

How does Stripe fit into the real-time payments landscape?

Stripe operates across the real-time payments ecosystem in a few distinct ways. The right payment type depends on whether you’re collecting payments or making disbursements.

ACH direct debit

Stripe supports the collection side of standard and Same Day ACH, including account verification, debit authorisation, and the payment flow itself. Businesses can access ACH without building direct bank integrations.

Instant bank payments

These are designed for consumer checkout rather than disbursements. When a customer pays via instant bank payments at checkout, Stripe handles the bank authentication flow and gives the business instant payment confirmation; the experience mirrors a card payment in terms of speed and certainty. Stripe settles those funds in two business days and backs the product with a guaranteed returns policy. It also absorbs the risk of payment failures rather than passing it onto the business. That’s a substantial difference from standard ACH, where return risk sits with whoever initiated the debit.

Payouts

Stripe’s payouts infrastructure can move funds across multiple payment networks depending on the recipient’s bank, speed required, and payout configuration. This works well for disbursements such as paying out to gig workers, settling insurance claims, and sending funds to suppliers.

How Stripe Payments can help

Stripe Payments enables businesses to set up and accept 125+ payment methods, including ACH Credit Transfers. It provides a unified, global payments solution that helps any business – from scaling startups to global enterprises – accept payments online, in person and around the world.

Stripe Payments can help you:

• Reconcile payments automatically: Easily reconcile ACH Credit Transfers to a specific payment or invoice with an automatic reconciliation engine that uses virtual bank accounts for each customer and tools for troubleshooting.

• Simplify refunds: Make refunds or return excess funds to the customer.

• Optimise your checkout experience: Create a frictionless customer experience and save thousands of engineering hours with prebuilt payment UIs and Link, Stripe's digital wallet.

• Expand to new markets faster: Reach customers worldwide and reduce the complexity and cost of multicurrency management with cross-border payment options, available in 195 countries across 135+ currencies.

• Unify payments in person and online: Build a unified commerce experience across online and in-person channels to personalise interactions, reward loyalty and grow revenue.

• Improve payments performance: Increase revenue with a range of customisable, easy-to-configure payment tools, including no-code fraud protection and advanced capabilities to improve authorisation rates.

• Move faster with a flexible, reliable platform for growth: Build on a platform designed to scale with you, with 99.999% historical uptime and industry-leading reliability.

Learn more about how Stripe Payments can power your online and in-person payments or get started today.