Same-Day ACH: How It Works, Cutoff Times, and Limits

Same-day ACH is a service on the Automated Clearing House network that settles domestic bank-to-bank payments within a single business day instead of the usual one to two days. Payments up to $1 million per entry qualify, they move through one of three processing windows on weekdays, and the recipient’s bank generally has to make credited funds available the same day. It sits between standard ACH (cheap but slow) and a wire transfer (fast but expensive), and works with virtually every U.S. bank account.

Processing Windows and Settlement Times

Same-day ACH runs on three windows every business day. Each window has a deadline for the originating bank to deliver files to the ACH operator, a target time when the operator distributes those files to receiving banks, and a settlement time when funds officially move between institutions.¹

Window 1: Files due by 10:30 AM ET. Distribution by noon ET. Settlement at 1:00 PM ET.
Window 2: Files due by 2:45 PM ET. Distribution by 4:00 PM ET. Settlement at 5:00 PM ET.
Window 3: Files due by 4:45 PM ET. Distribution by 5:30 PM ET. Settlement at 6:00 PM ET.

Settlement is the moment the Federal Reserve moves the money between banks. When your recipient can actually spend it depends on a separate Nacha rule for the receiving bank. For credits in the first window, the receiving bank must make funds available by 1:30 PM in its local time. For credits in the second window, the deadline is 5:00 PM local time.² Third-window entries settle at 6:00 PM ET and generally post by end of business day or early the next morning.

Your Bank’s Cutoff Is Earlier Than the Network Deadline

This is where people get tripped up. The deadlines above are for your bank to deliver files to the ACH operator, not for you to submit the payment to your bank. Your bank needs time to validate, batch, and transmit your entries before the network deadline hits. Most banks set their internal cutoffs 30 minutes to two hours earlier than the operator deadline. If your bank’s cutoff for the first window is 9:00 AM ET and you submit at 10:15 AM, your payment misses that window even though the network deadline is 10:30 AM.³ Check your bank’s published cutoffs before relying on the network schedule.

Weekends and Federal Holidays

Same-day ACH only processes on banking days. Nothing settles on Saturdays, Sundays, or federal holidays.⁴ A payment submitted Friday afternoon that misses the last window will not settle until Monday. If Monday is a holiday, it waits until Tuesday.

The Federal Reserve observes 11 holidays each year and FedACH processing suspends for each one. In 2026, those closures include New Year’s Day, Martin Luther King Jr. Day, Presidents Day, Memorial Day, Juneteenth, Independence Day, Labor Day, Columbus Day, Veterans Day, Thanksgiving, and Christmas.⁵ Payroll and accounts payable teams need to shift files accordingly. A payroll file that normally runs Friday for same-day direct deposit has to go out Thursday if Friday is a holiday.

How Same-Day Eligibility Is Determined

Originators do not need to flag a file with a special code to request same-day processing. The ACH operators (the Federal Reserve’s FedACH and EPN) determine eligibility automatically based on the effective entry date in the batch header. If that date is the current processing day, a stale date, or an invalid date, and the file arrives before the submission deadline, the entry settles same day. A future-dated entry will not, regardless of when you submit it.⁶

Most business banking platforms handle the effective-date field automatically when you pick a same-day option. If you are building ACH files directly, the effective entry date sits in the batch header while the Standard Entry Class code, amount, and account details go in the entry record.

The $1 Million Per-Entry Limit

Each individual same-day ACH entry is capped at $1 million. The cap applies per entry, not per day or per batch, so a business can send many $1 million payments in a single file. Any individual entry above $1 million is automatically routed to the next standard settlement cycle instead.⁶

That limit is going up. Nacha approved a rule raising the per-entry cap to $10 million, effective September 17, 2027. The change aligns same-day ACH with the RTP and FedNow networks, which already moved to $10 million limits in 2025.⁷ Until then, moving more than $1 million in a single entry means splitting the payment or sending a Fedwire.

What Qualifies (and What Doesn’t)

Most domestic ACH entry types qualify for same-day settlement, including payroll direct deposits, vendor payments, consumer bill payments, and account-to-account transfers. Both credits (money pushed to a recipient) and debits (money pulled from a payer) are eligible.

A few categories are out. International ACH Transactions cannot move same-day because the compressed timeline does not accommodate the required compliance screening. Entries using the ENR (Automated Enrollment) class code are ineligible. Re-presented check entries (RCK) and destroyed check entries (XCK) still qualify, but their per-transaction cap drops to $2,500.⁶ The receiving account must be at a U.S. financial institution.

Federal Tax Payments via EFTPS

The Electronic Federal Tax Payment System accepts same-day ACH debit payments for business and individual tax deposits, provided the payment is $1 million or less and submitted before 3:00 PM ET on a business day. Payments that miss that cutoff or exceed the dollar cap have to be scheduled at least one calendar day before the tax due date by 8:00 PM ET.⁸ Around quarterly estimated tax deadlines, a same-day payment submitted by mid-afternoon on the due date still counts as timely.

What It Costs

There are two layers of cost. Nacha rules require the originating bank to pay the receiving bank an interbank fee of 5.2 cents per same-day entry.⁹ That compensates receiving institutions for processing on the faster schedule; the ACH operators collect and distribute it through monthly billing.

On top of that, your bank charges its own origination fee, which varies widely by institution and account type. A 2022 industry survey put the median cost of initiating an ACH payment for businesses between 26 and 50 cents.¹⁰ Same-day entries typically carry a premium above standard ACH. Even at the higher end, they remain far cheaper than domestic wires, which commonly run $25 to $35 per transaction.

Information You Need to Send One

To originate a same-day ACH entry, you need the recipient’s full name, their bank’s nine-digit routing number, their account number, and whether the account is checking or savings.¹¹ You also need a signed authorization or digital consent record from the recipient before initiating the payment. For consumer debits, this authorization requirement is strict and must be in place before the first transaction.

Many corporate banking platforms require dual authorization, where a second user reviews and approves the batch before release. After submission, the bank generates a confirmation receipt and the entry routes through the next available processing window.

Returns and Reversals

ACH returns happen when the receiving bank sends an entry back, usually because the account number was wrong, the account was closed, or funds were insufficient. All return entries submitted before the 4:45 PM ET deadline are eligible for same-day settlement themselves, whether or not the original forward entry was same-day.⁶ Returns submitted after that deadline settle the following business day. When a return hits, the original payment amount is debited back, so monitoring your account on settlement day matters.

Reversals for Erroneous Entries

A reversal is different from a return. If you originated a payment in error, you can request a reversing entry, but only for specific reasons: duplicate entries, wrong recipient, wrong dollar amount, or a payment dated earlier or later than intended. The reversal must be transmitted within five banking days of the original entry’s settlement date, and the Company/Entry Description field must contain the word “REVERSAL” in all caps.¹²

Reversals are not guaranteed to recover funds. The receiving bank may return an improper reversal using specific return codes, and the recipient’s account may no longer hold enough money. Sending a reversal because you changed your mind or failed to fund the original entry is considered improper under Nacha rules, and receiving banks are permitted to reject those outright.

Consumer Protections for Unauthorized Debits

When an unauthorized ACH debit hits a consumer account, Regulation E, enforced by the Consumer Financial Protection Bureau, caps consumer liability based on how quickly you report the problem:

Report within 2 business days: liability capped at $50 or the amount of unauthorized transfers before you gave notice, whichever is less.
Report after 2 business days but within 60 days of your statement: liability capped at $500, including transfers that occurred after the two-day window that the bank could have prevented with earlier notice.
Report after 60 days from your statement date: you could be liable for the full amount of unauthorized transfers that occurred after the 60-day period, with no cap.¹³

Once you report the error, your bank has 10 business days to investigate. It can extend the investigation to 45 calendar days but must provisionally credit your account within the first 10. After completing the investigation, the bank has three business days to report findings, and if an error occurred, it must correct it within one business day of that determination.¹⁴ Extended timelines apply for new accounts and certain transaction types. The practical point: report unauthorized debits immediately, because every day you wait can raise your exposure.

Same-Day ACH vs. Wire Transfers and FedNow

Same-day ACH is not the only fast rail, and picking the wrong one costs time or money.

Wire transfers through Fedwire are irrevocable once sent, settle individually in near-real time, and have no per-transaction dollar cap. They are the right choice for high-value, time-critical payments like real estate closings or large intercompany transfers. Domestic wires commonly run $25 to $35 per outgoing transfer. For routine business payments under $1 million, same-day ACH accomplishes essentially the same result for a fraction of the price.

FedNow, the Federal Reserve’s instant payment service launched in 2023, settles individual transactions around the clock, including nights, weekends, and holidays. Where same-day ACH processes in batches during three weekday windows, FedNow settles each payment individually the moment it is submitted. The FedNow per-transaction limit is $10 million. The catch is adoption: not every bank and credit union has enrolled, so availability depends on whether both institutions support it. For payments that need true 24/7 immediacy at banks that offer it, FedNow is faster. For broad reach across virtually every U.S. bank account, same-day ACH remains the more universally available option.

1
Federal Reserve Financial Services. FedACH Processing Schedule
2
Nacha. Same Day ACH – Faster Funds Availability Guidance for RDFIs
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Nacha. Same Day ACH – Moving Payments Faster Phase 3
4
Nacha. SDA Schedules and Funds Availability
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Federal Reserve Financial Services. Holiday Schedules
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Federal Reserve Financial Services. Same Day ACH Frequently Asked Questions
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Nacha. Increasing the Same Day ACH Dollar Limit to $10 Million
8
Electronic Federal Tax Payment System (EFTPS). Financial Institution Handbook
9
Nacha. Same Day ACH – Moving Payments Faster Phase 1
10
Nacha. ACH Costs Are a Fraction of Check Costs for Businesses, AFP Survey Shows
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Nacha. ACH File Details
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Nacha. ACH Network Rules – Reversals and Enforcement
13
Consumer Financial Protection Bureau. 12 CFR Part 1005 Regulation E – 1005.6 Liability of Consumer for Unauthorized Transfers
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Consumer Financial Protection Bureau. Procedures for Resolving Errors – 12 CFR 1005.11