Blocking MCA ACH debits: what works

You can block an ACH debit. Your bank will do it if you ask. But blocking the debit doesn’t kill the obligation, it just triggers the default clause in your MCA agreement, and that’s when the real problems start. Most funders treat a blocked ACH as a declaration of war. Before you block anything, you need to understand what you’re actually setting off.

If you’re reading this, you’re probably already behind, or about to be. Read the whole thing before you call your bank.

What “blocking” actually means

There are three different things people mean when they say they’re going to block an MCA debit, and they are not the same.

• ACH revocation — you tell your bank, in writing, to stop authorizing debits from a specific originator. Under NACHA rules, the bank has to honor it. This is the cleanest version.
• ACH stop payment — you block a specific pending debit, by amount or by originator, usually for a set window (6 months is typical). Your bank will charge you $30-$35 per stop payment.
• Closing the account — you shut the account down entirely, and open a new one somewhere else. This is the nuclear option, and it’s the one that does the most damage to you, not the lender.

Most business owners don’t know the difference, and they ask the bank for the wrong thing. You want a written ACH revocation on file, with the originator ID and company name from the debit. Pull a recent statement, find the exact originator name, give it to the bank in writing. Verbal doesn’t count, and the bank will “lose” it.

What happens the moment the debit gets blocked

The MCA funder knows within 24 hours. Their software is watching the ACH return codes. When the return comes back as R08 (stop payment) or R10 (unauthorized), it’s flagged differently than a standard NSF. NSF they expect. A stop payment tells them you did this on purpose.

Here’s the order things usually happen:

• Hour 1-24: ACH return hits the funder’s system. Automated flag. Account gets routed to the in-house collections team, or in some cases, directly to outside counsel.
• Day 1-2: Collections calls start. Business line, cell, personal guarantor’s cell. Expect 10-15 calls a day from some funders. A few will also start emailing.
• Day 2-5: Balance is accelerated. You’ll get a notice (email, sometimes certified mail) stating the full purchased amount is now due, plus default fees, plus legal fees.
• Day 3-10: UCC notices go out. Your credit card processor, your customers if they’re on your bank statements, sometimes vendors. They get a letter instructing them to redirect payments to the funder.
• Day 7-30: If the funder is one of the aggressive ones, a confession of judgment gets filed (in states where it’s still enforceable), or a lawsuit gets filed in New York regardless of where your business is.

This isn’t theoretical. This is the standard playbook.

When blocking the ACH actually works

Blocking works, strategically, in a narrow set of situations:

• You’re about to close on a settlement or restructure, and you need to stop the bleeding for 5-10 days while it finalizes. The ACH block buys you time. The funder will be furious, but if a deal closes, the fury doesn’t matter.
• The funder is already in breach themselves — double-debiting, debiting the wrong amount, refusing to reconcile after a reconciliation request you submitted properly under the contract. In that case, the block is defensible and you have leverage.
• You’re pivoting to a bankruptcy filing within days. The automatic stay kicks in the moment you file, and the ACH block bridges the gap.
• You have counsel already engaged, and the block is part of a coordinated strategy, not a panic move.

That’s the list. That’s actually it.

When blocking the ACH backfires

This is the part most business owners don’t want to hear:

• If you block the ACH without a plan, you’ve just handed the funder the easiest default in their portfolio. They will accelerate, sue, and in many cases, win a default judgment within 60-90 days because you won’t answer the complaint correctly.
• If you have a personal guaranty (you almost certainly do), blocking the ACH puts your personal assets in play. House, personal accounts, wages if it gets that far.
• If the funder has a restraining order-friendly judge (most NY commercial parts do), your business and personal accounts can be frozen within 2-3 weeks of the block. Frozen means you can’t make payroll, can’t pay rent, can’t pay yourself. Frozen is worse than the daily debit by a wide margin.
• If you blocked the ACH and opened a new account at a different bank and moved deposits there, you’ve triggered multiple default clauses at once, and you’ve also given the funder’s lawyer a fraud narrative to work with. That’s a very different lawsuit than a simple breach.

Blocking the debit and then sitting still is the worst possible combination. You get all the consequences, with none of the benefits.

What to do instead, in most cases

Before you block anything, in this order:

• Pull every MCA agreement you have and read the default section. Yes, actually read it. Look for the reconciliation clause specifically.
• Submit a reconciliation request in writing if your revenue is down. Most MCA contracts require the funder to adjust the daily debit if your receipts have dropped. Most funders ignore this. That’s leverage later.
• Talk to someone who does this for a living before you make the move. Not your regular attorney, not your accountant — someone who handles MCA defaults specifically. The mechanics are different.
• If you’re going to block, block and act the same day. File, settle, restructure, whatever the next step is. Don’t block and wait.

Blocking the ACH is a tool. It’s not a strategy. Used alone, it accelerates the exact outcome you were trying to avoid.

The one thing nobody tells you

The funder’s collections team has a number in their head for your file. It’s lower than the balance. It’s always lower than the balance. Blocking the ACH, done wrong, moves that number up, not down, because now they’re paying legal fees and they want those fees back from you. Done right, as part of a pressure campaign with counsel, it can move the number down 40-60%.

Same action. Opposite outcomes. Depends entirely on what you do in the 72 hours after the block hits.