Let’s be clear upfront. Blocking an ACH on an active MCA is a default. Not a gray area, not a technicality – a default, the moment the debit bounces by your instruction. Your MCA agreement says so, in language that was written by attorneys who do nothing but draft these contracts. So if you’re reading this looking for permission, you’re in the wrong place. If you’re reading this because you’ve already decided, and you want to know what actually works versus what gets you sued faster, keep going.
Short answer
The methods that actually stop an MCA debit, in order of how well they work: (1) closing the account entirely and moving banking to a new institution the lender doesn’t know about, (2) issuing a written ACH revocation to your bank under NACHA rules, (3) a stop payment order on the specific transaction, and (4) switching processors so the lender loses the deposit stream they’re debiting against. Each one buys you time. None of them make the debt go away. And every one of them triggers the default clauses in your agreement, which means the clock starts on acceleration, UCC notices, and a lawsuit, usually within days.
What “blocking” actually means at your bank
Most business owners think of this as one thing. It’s not. There are four different mechanisms, and they don’t work the same way.
ACH revocation. You send your bank a written notice telling them you’ve revoked authorization for a specific originator (the MCA company). Under NACHA rules, the bank has to honor it. The catch – banks process these inconsistently. Some do it within 24 hours. Some lose the form. Some require you to come in person. And some will tell you to handle it directly with the originator, which is wrong, but they’ll say it anyway.
Stop payment order. This blocks a specific transaction or a specific dollar amount. The problem – MCA lenders know this trick. They’ll vary the debit amount by a few cents, or split one debit into two, and your stop payment misses it.
Account closure. The nuclear option. You close the account, the debit has nowhere to land, NSF. This is the most effective in the short term. It’s also the most aggressive default trigger in your agreement, and if you open the new account at the same bank, the lender’s collections team will find it inside of a week.
Processor switch. If your MCA is being repaid through a credit card processor split (a “lockbox” or “split funding” arrangement), changing processors cuts off the source. Same default trigger. Same speed of discovery.
What actually happens after the block hits
This is the part most articles skip. Here’s the order of events, in the real world.
- Hour 0 to 24: The debit returns NSF. Your bank charges you a fee, usually $35. The MCA lender’s system flags the return automatically.
- Hour 24 to 72: They retry. Sometimes twice. Each retry is another NSF if the block is in place. The lender’s collections team gets the file. You start getting calls.
- Day 3 to 7: Acceleration notice. The full balance becomes due. The personal guarantor (you, almost always) starts getting called too. They’ll call your business line, your cell, and if they have it, your home. Some will call your customers. They have your bank statements – they know who pays you.
- Day 5 to 14: UCC notices go out to your processor, your customers, and anyone else on those statements. The notices instruct them to redirect payments to the funder. Done correctly, your cash flow gets choked off in a day.
- Day 7 to 30: Lawsuit. In New York, where most MCA contracts are venued, the lender files in state court and frequently moves for an order of attachment or a confession of judgment if the contract had one (most pre-2019 contracts did, post-2019 most don’t). Either way, your accounts can be frozen fast.
What works, depending on your goal
Not every business owner blocking a debit wants the same outcome. Be honest about which one you are.
If your goal is to buy 30 days to restructure – account closure plus a new bank at a different institution is the move. Don’t open the new account at Chase if your old one was Chase. Don’t use the same EIN-linked profile. Move your operating deposits before you close, not after. And get a debt settlement attorney or firm engaged before the block hits, not after, because the window between default and lawsuit is shorter than you think.
If your goal is to force the lender to the negotiating table – blocking the ACH does work for this, but only if you’re prepared for the acceleration and the calls, and only if you have someone (a settlement firm, an attorney) ready to pick up the phone when the lender calls and start a real conversation. A block with no follow-up plan is just a slower way to get sued.
If your goal is to stop paying because you can’t pay – the block isn’t the strategy, it’s the symptom. The strategy is the workout. Blocking buys you maybe two weeks of cash retention before the UCC notices start hitting your processor and your customers, and once those go out, your AR is frozen worse than the debit ever was.
If you have multiple MCAs (stacked) – blocking one is treated as default on all of them under the cross-default language most agreements have. You don’t get to pick which one to fight. You’re fighting all of them at once. Plan accordingly.
What does not work, no matter what you read online
- “Just call your bank and tell them to block it.” Maybe works, maybe doesn’t, depends on the rep, doesn’t create a paper record, and if the debit goes through anyway, you have no recourse. Always do it in writing.
- “Open a new account at the same bank under a DBA.” They’ll find it. Same EIN, same login, same officer. Inside of a week.
- “Just stop paying and don’t tell anyone.” You’re not blocking, you’re just NSF’ing. Same default, plus you look disorganized instead of strategic, which hurts you when settlement talks start.
- “Use a personal account for business deposits temporarily.” Now you have personal liability exposure on top of the PG you already signed, and you’ve given the lender a fraudulent transfer argument for free.
The thing nobody tells you
Blocking the ACH is the easy part. The hard part is what comes 72 hours later, when the calls start, the UCC notices go out, and you realize you bought yourself three days of cash flow in exchange for the lender now treating you as a hostile defendant instead of a struggling customer. The block is a tactic. It only works if it’s part of a plan. If you don’t have the plan, get one before you push the button – because once you push it, you don’t get to un-push it, and the lender’s response is going to come faster than you expect.
