The ACH Debit Block: How to Stop a Lender From Draining Your Business Account

When a lender, a factor, or a merchant cash advance funder gets your bank details and an authorization form, they can pull money directly from your account by ACH — often daily, often before you’ve had a chance to look at your balance. Business owners call us when those pulls have already emptied the account and bounced payroll. The good news: you can stop an ACH debit. The hard part: a business account does not carry the same automatic rights a personal account does, so you have to do it correctly and in the right order.

This is a plain walk-through of how ACH pulls work, what protections you actually have, and the concrete steps to shut a debit off — without pretending it erases the debt.

What an ACH debit really is

ACH stands for Automated Clearing House — the electronic network that moves the great majority of direct deposits and recurring payments in the United States. When you sign a funder’s authorization form (sometimes buried in the funding agreement), you give that company standing permission to originate debits against your account. Each pull rides through the ACH network under rules written by Nacha, the private association that governs the system.

Two things about that authorization matter most:

• It is a separate document from the loan. The authorization to debit your account and the promise to repay are legally distinct. You can revoke the first without erasing the second.
• The rules require a way out. Under the Nacha Operating Rules, an authorization for consumer or business debits must be revocable, and you are entitled to give notice to stop it. Nacha’s own authorization framework spells out that an originator must honor a revocation received in the time and manner described in the authorization.

Why Regulation E won’t save your business account

Here is the trap most owners don’t know about. The strong federal consumer rule that lets an individual stop a recurring debit — Regulation E, which implements the Electronic Fund Transfer Act — applies to accounts held by a natural person for personal, family, or household purposes. It does not cover an account you opened for your business. The Consumer Financial Protection Bureau’s Regulation E defines a covered “account” that way on its face.

So the clean, statutory right a consumer has to tell their bank “stop this recurring payment” and have the bank block it does not automatically extend to your LLC’s operating account. Business ACH debits are governed instead by your account agreement with the bank and by UCC Article 4A, the commercial funds-transfer rules your state has adopted. That means your leverage comes from the contract and the Nacha rules, not from a consumer statute. It also means banks are not obligated to give you the same free, easy stop-payment tools they give consumers — and many charge a fee.

The two steps people skip — and get wrong

Stopping a debit is really two separate actions, aimed at two different parties. Do only one and the pull often keeps coming.

Step 1 — Revoke authorization with the company debiting you

Send the funder or lender written notice that you are revoking their ACH authorization, effective immediately. Reference the authorization in your agreement, state the account, and demand written confirmation. Keep proof of delivery. This is the step that goes to the source of the pull.

Revoking with the originator is important because a debit submitted after you’ve properly revoked is no longer authorized under the Nacha rules — and an unauthorized business debit is a claim you can press with your bank and, if needed, in court.

Step 2 — Give your bank a written stop-payment or ACH block

Separately, tell your bank in writing to stop or block the debit. The CFPB’s guidance on stopping automatic payments describes the general mechanics: you can order your bank to stop a payment, and a bank will typically ask for the order in writing. For a business account, check your deposit agreement for the exact notice window and any fee. You can ask the bank to block a single pull or to place a broader ACH block against that originator so future attempts are rejected.

Doing both matters. Step 1 removes the legal permission. Step 2 puts a wall at the bank in case the originator ignores you and tries anyway.

What revoking does — and does not — do

This is the part that gets owners in trouble, so read it twice. Cutting off the ACH pull stops the mechanism of payment. It does not cancel the debt, and in many financing contracts it actually triggers consequences:

• It can be an event of default. Many MCA and short-term loan agreements list “interfering with or revoking the ACH authorization” as a breach that lets the funder accelerate the full balance.
• It can expose a personal guaranty or a confession of judgment. If you signed a personal guarantee, or a confession of judgment, blocking the debit may be exactly the move that lets the funder pursue those remedies.
• It does not reduce what you owe. You still owe the balance under the note. You’ve only changed how, and whether, it gets collected automatically.

So a block is a tool, not a strategy by itself. The right time to use it is when a debit is genuinely unauthorized, when the amount is wrong, or when you need to stop the bleeding while you negotiate — not as a way to quietly walk from a valid debt.

When a block is the right call

There are situations where stopping the pull is clearly justified and defensible:

• The debit exceeds what was authorized. If the funder pulls more than the fixed daily or weekly amount you agreed to, that overage is not authorized.
• You already paid off or settled. Pulls that continue after payoff are unauthorized — and worth a written demand plus a bank block.
• You have a reconciliation right and sales dropped. Many MCA contracts include a reconciliation clause letting you adjust the debit to true revenue. If the funder won’t honor it, a block can force the conversation.
• Fraud or an unknown originator. A debit from a company you never authorized should be disputed and blocked at once.

How to do it cleanly — a checklist

• Read the authorization language first. Find the revocation terms in your agreement so your notice matches them exactly.
• Revoke in writing to the originator. Email plus certified mail. Demand written confirmation and a stop date.
• Order the stop or block at your bank in writing. Ask specifically for an ACH block against that originator, not just a one-time stop.
• Move critical funds. If payroll or rent clears from that account, consider moving essential balances so a rogue pull can’t catch them while the block takes effect.
• Document every attempted pull afterward. A debit that hits after a proper revocation is your evidence of an unauthorized transaction.
• Get advice before you block a valid debt. If a personal guaranty or confession of judgment is in play, talk to counsel first.

The takeaway

You are not powerless against an ACH debit — but you are not a consumer in the eyes of the law, either. Your business account lives under your deposit agreement and UCC Article 4A, not the friendlier Regulation E, so you have to revoke authorization with the originator and place a written stop or block with your bank. Just remember what a block is: it turns off the pump, not the well. The debt survives, the contract may punish you for the block, and the smart play is to use it deliberately — to stop an unauthorized or excessive pull, or to protect payroll while you negotiate — not as a way to disappear from a debt you still owe.

Important: MidBank is not a bank, a financial institution, or a financial advisor. We are an advocate and ISO affiliate that connects businesses to vetted third-party providers. This article is general information published on August 28, 2026, not legal, tax, or financial advice — rules and rates change, and your situation is specific to you. Confirm details with the primary sources linked above and with a qualified tax or legal professional before acting.